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Journal articles on the topic 'Perigee and Apogee radius'

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Published: 4 June 2025

Last updated: 1 August 2025

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1

N., Gayathri, and Mahalakshmi S. "A Study on Orbital Mechanics." International Journal of Trend in Scientific Research and Development 2, no. 2 (2018): 1263–76. https://doi.org/10.31142/ijtsrd9627.

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Space craft to solar system bodies must deal with multiple deviations under the in uence of gravity. The motion of satellite in one of the types of conic section strongly depends upon escape velocity. The goal of this paper is to nd the trajectory of satellite by analysing orbits eccentricity and or bital parameters. This paper also focuses on the derivation of general orbit equation from the base called Newtons law of motion and Newtons law of gravitation. N. Gayathri | S. Mahalakshmi "A Study on Orbital Mechanics" Published in International Journal of Trend in Scientific Research a

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2

Dwi Aryani, Puput. "Analisis Klasifikasi dan Korelasi Antara Visibilitas Hilal dengan Bujur Perigee dan Apogee Tahun 1300h-1600h." Azimuth: Journal of Islamic Astronomy 6, no. 1 (2025): 79–131. https://doi.org/10.15642/azimuth.v6i1.2672.

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This article analyzes the classification and correlation between the longitudes of perigee and apogee with crescent moon visibility to understand the influence of these factors on the determination of the beginning of the lunar month. Primary data sources were obtained from calculated classifications of crescent moon visibility based on the longitudes of perigee and apogee from the years 1300H to 1600H for three locations: Sabang, Surabaya, and Merauke. Secondary data were sourced from Microsoft Excel. Data collection was conducted through documentation by studying the books Lunar Tables and P

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3

Maslova, A. I., A. V. Pirozhenko, and O. O. Pirozhenko. "Effect of the solar radiation pressure on the motion of satellites in almost circular Earth orbits." Technical mechanics 2024, no. 2 (2024): 41–54. http://dx.doi.org/10.15407/itm2024.02.041.

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This paper considers the effect of the solar radiation pressure on the motion of a satellite in an almostcircular low-Earth orbit. The formulation of the problem is due to the need to determine the effect of solar radiation pressure forces on the motion of light commercial Earth remote sensing (ERS) satellites with large surface areas (solar batteries and antennas). The goal is to determine the main regularities of this effect, construct reasonably simple and accurate estimates of changes in orbital parameters for the orbits under consideration, and clarify their physics (cause-and-effect rela

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Terekhov, O., R. A. Sunyaev, D. Denisenko та ін. "Observations of γ-ray Bursts and Solar Flares with Granat". International Astronomical Union Colloquium 151 (1995): 353–57. http://dx.doi.org/10.1017/s025292110003534x.

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The Granat observatory was launched into a high apogee orbit on 1989 December 1 by a PROTON launcher. The initial Granat orbit had an apogee close to 200000 km and a perigee of 2000 km with an orbital period of 4 days. The satellite is entering the radiation belts for a few hours every orbit. Due to orbital evolution the perigee increased and the apogee decreased with time. After about 1.5 years of operation the perigee increased up to 20000 km. This has put the satellite completely outside of the proton radiation belts which makes the detector activation during the perigee passage negligible.

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ZHANG, C. M. "QUASI PERIODIC OSCILLATIONS IN X-RAY NEUTRON STAR AND PROBES OF PERIHELION PRECESSION OF GENERAL RELATIVITY." International Journal of Modern Physics D 11, no. 04 (2002): 503–10. http://dx.doi.org/10.1142/s0218271802001822.

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We ascribe the twin kilohertz Quasi Periodic Oscillations (kHz QPOs) of X-ray spectra of Low Mass X-Ray Binaries (LMXBs) to the pseudo-Newtonian Keplerian frequency and the apogee and perigee precession frequency of the same matter in the inner disk, and ascribe 15–60 Hz QPO (HBO) to the apogee (or perigee) precession and its second harmonic frequency to both apogee and perigee precession in the outer disk boundary of the neutron star (NS) magnetosphere. The radii of the inner and outer disks are correlated each other by a factor of two is assumed. The obtained conclusions include: all QPO fre

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Mahdi, Mohammed Chessab. "Study the Space Debris Impact in the Early Stages of the Nano-Satellite Design." Artificial Satellites 51, no. 4 (2016): 163–72. http://dx.doi.org/10.1515/arsa-2016-0014.

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Abstract The probability of KufaSat collisions with different sizes of orbital debris and with other satellites which operating in the same orbit during orbital lifetime was determined. Apogee/Perigee Altitude History was used to graph apogee and perigee altitudes over KufaSat lifetime. The required change in velocity for maneuvers necessary to reentry atmospheric within 25 years was calculated. The prediction of orbital lifetime of KufaSat using orbital parameters and engineering specifications as inputs to the Debris Assessment Software (DAS) was done, it has been verified that the orbital l

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Perryman, M. A. C. "In-Orbit Status of the Hipparcos Astrometry Mission." Symposium - International Astronomical Union 141 (1990): 297–305. http://dx.doi.org/10.1017/s0074180900086976.

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The Hipparcos satellite was successfully launched by Ariane 4 flight 33, from French Guyana, on 8 August 1989. However, the apogee boost motor, designed to place the satellite into its intended geostationary orbit, failed to function, and the satellite was left in a highly elliptical transfer orbit. After a perigee raising manoeuvre, using the hydrazine propulsion system, the orbital parameters are approximately: apogee 35900 km, perigee 526 km, eccentricity 0.72, inclination 6.8°, orbital period 10h 40m.Operational procedures have had to be revised during the first weeks of satellite operatio

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Jeyakodi David, Jim Fletcher, and Ram Krishan Sharma. "Lifetime Estimation of the Upper Stage of GSAT-14 in Geostationary Transfer Orbit." International Scholarly Research Notices 2014 (October 29, 2014): 1–8. http://dx.doi.org/10.1155/2014/864953.

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The combination of atmospheric drag and lunar and solar perturbations in addition to Earth’s oblateness influences the orbital lifetime of an upper stage in geostationary transfer orbit (GTO). These high eccentric orbits undergo fluctuations in both perturbations and velocity and are very sensitive to the initial conditions. The main objective of this paper is to predict the reentry time of the upper stage of the Indian geosynchronous satellite launch vehicle, GSLV-D5, which inserted the satellite GSAT-14 into a GTO on January 05, 2014, with mean perigee and apogee altitudes of 170 km and 3597

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9

Sinha, A. K., T. K. Yeoman, J. A. Wild, D. M. Wright, S. W. H. Cowley, and A. Balogh. "Evidence of transverse magnetospheric field line oscillations as observed from Cluster and ground magnetometers." Annales Geophysicae 23, no. 3 (2005): 919–29. http://dx.doi.org/10.5194/angeo-23-919-2005.

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Abstract. The dynamic spectrum of ULF waves from magnetic field data obtained by the elliptically orbiting Cluster satellites (with an apogee of 119000km, perigee of 19000km and the orbital period of 57h) have been prepared in the frequency range 0 to 120mHz when the satellite was near its perigee. The existence of field line oscillations, with increasing frequency in the inbound sector and decreasing frequency in the outbound sector, is seen in the transverse components, indicating the presence of independently oscillating local magnetic flux tubes in the form of transverse standing Alfvén wa

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10

Stoklosa, Adam M., Ilan Weiss, Bruce Bugbee, Michele H. Perchonok, and Lisa J. Mauer. "Composition and Functional Properties of Apogee and Perigee Compared to Common Terrestrial Wheat Cultivars." Habitation 12, no. 1 (2009): 1–8. http://dx.doi.org/10.3727/154296610x12686999887049.

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11

Stoklosa, Adam M., Ilan Weiss, Bruce Bugbee, Michele H. Perchonok, and Lisa J. Mauer. "Composition and Functional Properties of Apogee and Perigee Compared to Common Terrestrial Wheat Cultivars." International Journal of Food Properties 14, no. 5 (2011): 996–1006. http://dx.doi.org/10.1080/10942910903556447.

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12

Mozaffari, S. Mohammad. "The Orbital Elements of Venus in Medieval Islamic Astronomy: Interaction Between Traditions and the Accuracy of Observations." Journal for the History of Astronomy 50, no. 1 (2019): 46–81. http://dx.doi.org/10.1177/0021828618808877.

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The orbital elements of each planet are the eccentricity and the direction of the apsidal line of its orbit defined by the ecliptic longitude of either of its apses, i.e., the two points on its orbit where the planet is either furthest from or closest to the Earth, which are called the planet’s apogee and perigee. In the geocentric view of the solar system, the eccentricity of Venus is a bit less than half of the solar one, and its apogee is located behind that of the Sun. Ptolemy correctly found that the apogee of Venus is behind that of the Sun, but determined the eccentricity of Venus to be

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Paing, Soe Thu Oo. "Optimization of the launch profile of geostationary spacecraft with electric propulsion system using Falcon-9 launch vehicle." Spacecrafts & Technologies 7, no. 1 (2023): 35–43. http://dx.doi.org/10.26732/j.st.2023.1.04.

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A combined flight profile is being considered, in which the Falcon 9 launch vehicle launches the spacecraft into elliptical intermediate orbit from the Cape Canaveral launch site. In the process of analyzing the problem, the value of the height of the perigee and the inclination of the intermediate orbit are fixed, and the height of the apogee of the intermediate orbit varies. After separation from the last stage of the launch vehicle, the spacecraft carries out transfer to geostationary orbit using electric propulsion system. At the stage of insertion spacecraft from intermediate orbit to geo

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Chu, Li-Ching, Fei-Chi Chuang, Fu-Tsai Kung, and Kuan-Hui Huang. "Comparison of short-term outcomes following pelvic reconstruction with Perigee and Apogee systems: hysterectomy or not?" International Urogynecology Journal 23, no. 1 (2011): 79–84. http://dx.doi.org/10.1007/s00192-011-1513-1.

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15

Alekseytsev, S. A., V. K. Bader, V. D. Rachkov, and A. S. Tolstikov. "Gravitational influence on the frequency-time characteristics of GLONASS navigation satellites onboard clocks." Interexpo GEO-Siberia 8, no. 2 (2022): 41–46. http://dx.doi.org/10.33764/2618-981x-2022-8-2-41-46.

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The paper considers one of the ways to improve the global navigation satellite system (GNSS) GLONASS by introducing into the regular constellation of navigation spacecraft (NSV) a high-orbit segment of satellites, for which the height at apogee significantly exceeds the height at perigee, as well as satellites with geosynchronous orbits. Such improvement of the space constellation of the navigation system allows to achieve an increase in the quality of navigation information for consumers. The issue of using inter-satellite measurements (ISM) with the aim of increasing the information content

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16

Filatyev, A. S., and O. V. Yanova. "The Optimal Control by the Thrust Vector of Air-Breathing Electric Propulsion to Maximize the Apogee Altitude of Orbit with an Ultra-Low Perigee." Космические исследования 61, no. 2 (2023): 163–76. http://dx.doi.org/10.31857/s0023420622600222.

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The problem of changing the apogee altitude of orbits with ultralow perigee (altitude 120–250 km) is considered. To compensate for the aerodynamic drag of the spacecraft, an air-breathing electric propulsion (ABEP) is used, the fuel for which is the gases of the outboard atmosphere. The decrease in the efficiency of an ABEP with an increase in the angle of attack and the possibility of ABEP operation only at a sufficient gas concentration in the ionization chamber are taken into account. The problem is solved on the basis of the Pontryagin maximum principle under the assumption that the aerody

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17

Gandhi, J., and R. Acharyya. "O328 Perigee-Apogee meshes for repair of pelvic organ prolapse - A clinical evaluation and 9 months follow up." International Journal of Gynecology & Obstetrics 107 (October 2009): S186. http://dx.doi.org/10.1016/s0020-7292(09)60700-1.

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18

Kim, Dongwoo, and Taejin Chung. "Design of an Elliptical Orbit for High-Resolution Optical Observation at a Very Low Altitude over the Korean Peninsula." Journal of Astronomy and Space Sciences 40, no. 1 (2023): 35–44. http://dx.doi.org/10.5140/jass.2023.40.1.35.

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Surveillance and reconnaissance intelligence in the space domain will become increasingly important in future battlefield environments. Moreover, to assimilate the military provocations and trends of hostile countries, imagery intelligence of the highest possible resolution is required. There are many methods for improving the resolution of optical satellites when observing the ground, such as designing satellite optical systems with a larger diameter and lowering the operating altitude. In this paper, we propose a method for improving ground observation resolution by using an optical system f

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19

H.S., Abdul Rahman. "Study the variation of synodic month for the moon through 2000-2100." Iraqi Journal of Physics (IJP) 14, no. 29 (2019): 138–44. http://dx.doi.org/10.30723/ijp.v14i29.229.

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In this research study the synodic month for the moon and theirrelationship with the mean anomaly for the moon orbit and date A.Dand for long periods of time (100 years), we was design a computerprogram that calculates the period of synodic months, and thecoordinates of the moon at the moment of the new moon with highaccuracy. During the 100 year, there are 1236 period of synodicmonths.We found that the when New Moon occurs near perigee (meananomaly = 0°), the length of the synodic month at a minimum.Similarly, when New Moon occurs near apogee (mean anomaly =180°), the length of the synodic mo

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20

Lukban, James C., Roger D. Beyer, and Robert D. Moore. "Incidence of Extrusion Following Type I Polypropylene Mesh “Kit” Repairs in the Correction of Pelvic Organ Prolapse." Obstetrics and Gynecology International 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/354897.

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Introduction and Hypothesis. We sought to determine the mesh extrusion (vaginal exposure) rates and subject outcomes following IntePro (Type I polypropylene) mesh “kit” repairs for vaginal prolapse.Methods. Data were pooled from two prospective multicenter studies evaluating the safety and efficacy of the Perigee and Apogee (American Medical Systems, Minnetonka, Minn, USA) to treat anterior and posterior/apical prolapses, respectively. Extrusions involving the anterior compartment (AC) or posterior compartment/apex (PC/A) were recorded.Results. Two hundred sixty women underwent mesh placement,

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21

Pedersen, Olaf. "Greek Astronomers and Their Neighbours." International Astronomical Union Colloquium 91 (1987): 63–73. http://dx.doi.org/10.1017/s0252921100105871.

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In Europe it has been customary to regard the ancient Greeks as our intellectual ancestors. Greek science was seen as the fountainhead from which modern European science ultimately derived both its existence and its characteristic features. This was not a completely empty idea. Each time a modern astronomer mentions a planet, the perigee and apogee of its orbit, its periods and their various anomalies, he is using so many Greek words. Moreover, until about a hundred years ago the extant works of the Greeks were the earliest scientific texts known to European scholars so that Greek science acqu

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22

Caswell, Joey M., Mark W. G. Collins, David A. E. Vares, Lyndon M. Juden-Kelly, and Michael A. Persinger. "Gravitational and Experimental Electromagnetic Contributions to Cerebral Effects upon Deviations from Random Number Variations Generated by Electron Tunneling." International Letters of Chemistry, Physics and Astronomy 16 (September 2013): 72–85. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.16.72.

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New theoretical and traditional quantitative solutions involving a pervasive unit quantum of ~10-20 J within biological and large-scale physical systems predicted that the mass of the human subject, subtle changes in gravitational phenomena, and the energy available within the cerebral volume should affect proximal random number variations produced by electron tunneling. In a series of experiments application of a specific, physiologically-patterned weak magnetic field over the right temporal lobe significantly enhanced the effects of intention upon deviations from random variations created by

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Caswell, Joey M., Mark W. G. Collins, David A. E. Vares, Lyndon M. Juden-Kelly, and Michael A. Persinger. "Gravitational and Experimental Electromagnetic Contributions to Cerebral Effects upon Deviations from Random Number Variations Generated by Electron Tunneling." International Letters of Chemistry, Physics and Astronomy 16 (August 5, 2013): 72–85. http://dx.doi.org/10.56431/p-f95317.

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New theoretical and traditional quantitative solutions involving a pervasive unit quantum of ~10-20 J within biological and large-scale physical systems predicted that the mass of the human subject, subtle changes in gravitational phenomena, and the energy available within the cerebral volume should affect proximal random number variations produced by electron tunneling. In a series of experiments application of a specific, physiologically-patterned weak magnetic field over the right temporal lobe significantly enhanced the effects of intention upon deviations from random variations created by

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24

Alexandr, Pirozhenko, Maslova Anna, Khramov Dmitry, Volosheniuk Oksana, and Mischenko Alexandra. "DEVELOPMENT OF A NEW FORM OF EQUATIONS OF DISTURBED MOTION OF A SATELLITE IN NEARLY CIRCULAR ORBITS." Eastern-European Journal of Enterprise Technologies 4, no. 5 (106) (2020): 70–77. https://doi.org/10.15587/1729-4061.2020.207671.

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The use of simple physical reasoning instead of the method of varying constants has made it possible to elaborate a short scheme of deriving equations of disturbed motion of a satellite in nearly circular orbits. The use of a circular Keplerian orbit as a reference orbit has ensured the nondegeneracy of equations and their simple relation with time. All this taken together has made it possible to propose a form of equations convenient for carrying out numerical and analytical studies with its variables having a simple physical meaning. A relationship between the introduced variables and the Ke

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Sarychev, O. P. "Detection of changes in the motion of Earth-orbiting objects by autoregressive models in conditions of non-equidistant observations." Technical mechanics 2022, no. 2 (2022): 25–38. http://dx.doi.org/10.15407/itm2022.02.025.

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The problem of increasing prediction accuracy for the motion of Earth-orbiting objects (EOOs) and detecting changes therein is topical for the tasks of spacecraft life prediction, space debris cataloguing, and navigation. Therefore, the problem of detecting changes in dynamic systems characterized by non-equidistant observations is topical. The purpose of this work is the development of autoregressive models with observations non-equidistant in time to detect changes in EOO motion. The methods employed are multivariate statistical analysis, time series prediction, and complex-system simulation

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Wanderley, Fábio, Katia Cunha, Oleg Kochukhov, et al. "Magnetic Fields in M-dwarf Members of the Pleiades Open Cluster Using APOGEE Spectra." Astrophysical Journal 971, no. 1 (2024): 112. http://dx.doi.org/10.3847/1538-4357/ad571f.

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Abstract Average magnetic field measurements are presented for 62 M-dwarf members of the Pleiades open cluster, derived from Zeeman-enhanced Fe i lines in the H band. A Markov Chain Monte Carlo methodology was employed to model magnetic filling factors using Sloan Digital Sky Survey (SDSS) IV APOGEE high-resolution spectra, along with the radiative transfer code Synmast, MARCS stellar atmosphere models, and the APOGEE Data Release 17 spectral line list. There is a positive correlation between mean magnetic fields and stellar rotation, with slow-rotator stars (Rossby number, Ro > 0.13) exhib

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27

Trishchenko, Alexander P., Louis Garand, and Larisa D. Trichtchenko. "Three-Apogee 16-h Highly Elliptical Orbit as Optimal Choice for Continuous Meteorological Imaging of Polar Regions." Journal of Atmospheric and Oceanic Technology 28, no. 11 (2011): 1407–22. http://dx.doi.org/10.1175/jtech-d-11-00048.1.

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Abstract A highly elliptical orbit (HEO) with a 16-h period is proposed for continuous meteorological imaging of polar regions from a two-satellite constellation. This orbit is characterized by three apogees (TAP) separated by 120°. The two satellites are 8 h apart, with repeatable ground track in the course of 2 days. Advantages are highlighted in comparison to the Molniya 12-h orbit described in detail in a previous study (Trishchenko and Garand). Orbital parameters (period, eccentricity, and inclination) are obtained as a result of an optimization process. The principles of orbit optimizati

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Vogt, Joachim, Octav Marghitu, Adrian Blagau, et al. "Daedalus Ionospheric Profile Continuation (DIPCont): Monte Carlo studies assessing the quality of in situ measurement extrapolation." Geoscientific Instrumentation, Methods and Data Systems 12, no. 2 (2023): 239–57. http://dx.doi.org/10.5194/gi-12-239-2023.

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Abstract. In situ satellite exploration of the lower thermosphere–ionosphere system (LTI) as anticipated in the recent Daedalus mission proposal to ESA will be essential to advance the understanding of the interface between the Earth's atmosphere and its space environment. To address physical processes also below perigee, in situ measurements are to be extrapolated using models of the LTI. Motivated by the need for assessing how cost-critical mission elements such as perigee and apogee distances as well as the number of spacecraft affect the accuracy of scientific inference in the LTI, the Dae

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Myers, Natalie, John Donor, Taylor Spoo, et al. "The Open Cluster Chemical Abundances and Mapping Survey. VI. Galactic Chemical Gradient Analysis from APOGEE DR17." Astronomical Journal 164, no. 3 (2022): 85. http://dx.doi.org/10.3847/1538-3881/ac7ce5.

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Abstract The goal of the Open Cluster Chemical Abundances and Mapping (OCCAM) survey is to constrain key Galactic dynamic and chemical evolution parameters by the construction and analysis of a large, comprehensive, uniform data set of infrared spectra for stars in hundreds of open clusters. This sixth contribution from the OCCAM survey presents analysis of SDSS/APOGEE Data Release 17 (DR17) results for a sample of stars in 150 open clusters, 94 of which we designate to be “high-quality” based on the appearance of their color–magnitude diagram. We find the APOGEE DR17-derived [Fe/H] values to

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Cabrera, J., M. Cyamukungu, P. Stauning, et al. "Fluxes of energetic protons and electrons measured on board the Oersted satellite." Annales Geophysicae 23, no. 9 (2005): 2975–82. http://dx.doi.org/10.5194/angeo-23-2975-2005.

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Abstract. The Charged Particle Detector (CPD) on board the Oersted satellite (649 km perigee, 865 km apogee and 96.48° inclination) currently measures energetic protons and electrons. The measured peak fluxes of E>1 MeV electrons are found to confirm the predictions of AE8-MAX, though they occur at a geographical position relatively shifted in the SAA. The fluxes of protons are one order of magnitude higher than the predictions of AP8-MAX in the energy range 20-500 MeV. This huge discrepancy between AP8 and recent measurements in LEO was already noticed and modelled in SAMPEX/PSB97 and TPM-

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Persinger, Michael A. "Terrestrial and Lunar Gravitational Forces upon the Mass of a Cell: Relevance to Cell Function." International Letters of Chemistry, Physics and Astronomy 21 (November 2013): 15–21. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.21.15.

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The gravitational force between the mass of an average mammalian cell and the earth is in the order of a picoNewton. When applied across the plasma membrane the energy is within the domain of 10-20 J that is associated with the distance between forces of ions that are correlated with the membrane potential. Solutions for velocity and acceleration are congruent with known properties of the ion channel and cell membrane. The differences in gravitational forces between lunar perigee and apogee are within the 10-20 J range when applied across distances that constitute neuronal processes. Calculati

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Persinger, Michael A. "Terrestrial and Lunar Gravitational Forces upon the Mass of a Cell: Relevance to Cell Function." International Letters of Chemistry, Physics and Astronomy 21 (November 4, 2013): 15–21. http://dx.doi.org/10.56431/p-e3tk4p.

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The gravitational force between the mass of an average mammalian cell and the earth is in the order of a picoNewton. When applied across the plasma membrane the energy is within the domain of 10-20 J that is associated with the distance between forces of ions that are correlated with the membrane potential. Solutions for velocity and acceleration are congruent with known properties of the ion channel and cell membrane. The differences in gravitational forces between lunar perigee and apogee are within the 10-20 J range when applied across distances that constitute neuronal processes. Calculati

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Mackereth, J. Ted, Jo Bovy, Henry W. Leung, et al. "Dynamical heating across the Milky Way disc using APOGEE and Gaia." Monthly Notices of the Royal Astronomical Society 489, no. 1 (2019): 176–95. http://dx.doi.org/10.1093/mnras/stz1521.

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Abstract The kinematics of the Milky Way disc as a function of age are well measured at the solar radius, but have not been studied over a wider range of Galactocentric radii. Here, we measure the kinematics of mono-age, mono-[Fe/H] populations in the low and high [α/Fe] discs between 4 ≲ R ≲ 13 kpc and |z| ≲ 2 kpc using 65 719 stars in common between APOGEE DR14 and Gaia DR2 for which we estimate ages using a Bayesian neural network model trained on asteroseismic ages. We determine the vertical and radial velocity dispersions, finding that the low and high [α/Fe] discs display markedly differ

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Al-Zaidi, H. K., M. J. Al-Bermani, and A. M. Taleb. "Reentry of Space Debris from Low Earth Orbit by Pulsed Nd:YAG Laser." Journal of Kufa-Physics 12, no. 02 (2020): 39–51. http://dx.doi.org/10.31257/2018/jkp/2020/120204.

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This research studies the orbital dynamics of space debris in near earth orbit. The orbital dynamics of space debris is closely examined in near earth orbit whereby (apogee altitude ha=1200 km and perigee altitude hp=200 km). In addition, the lifetime of the space debris is calculated using the influence of the friction force exerted on the atmospheric particles with debris dimensions measuring between (1 and 10 cm). In this study, the Drag Thermospheric Models (DTM78 and DTM94) are used because of their dependence on solar and geomagnetic activities, and pulsed lasers are utilized to interact

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Al-Zaidi, H. K., M. J. Al-Bermani, and A. M. Taleb. "Reentry of Space Debris from Low Earth Orbit by Pulsed Nd:YAG Laser." Journal of Kufa-Physics 12, no. 02 (2020): 39–51. http://dx.doi.org/10.31257/2018/jkp/2020/120204.

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This research studies the orbital dynamics of space debris in near earth orbit. The orbital dynamics of space debris is closely examined in near earth orbit whereby (apogee altitude ha=1200 km and perigee altitude hp=200 km). In addition, the lifetime of the space debris is calculated using the influence of the friction force exerted on the atmospheric particles with debris dimensions measuring between (1 and 10 cm). In this study, the Drag Thermospheric Models (DTM78 and DTM94) are used because of their dependence on solar and geomagnetic activities, and pulsed lasers are utilized to interact

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Wei, Zhang, Cui Wen, Wang Xiuhong, Wei Dong, and Liu Xing. "Re-entry prediction of objects with low-eccentricity orbits based on mean ballistic coefficients." Open Astronomy 29, no. 1 (2020): 210–19. http://dx.doi.org/10.1515/astro-2020-0006.

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AbstractDuring re-entry objects with low-eccentricity orbits traverse a large portion of the dense atmospheric region almost every orbital revolution. Their perigee decays slowly, but the apogee decays rapidly. Because ballistic coefficients change with altitude, re-entry predictions of objects in low-eccentricity orbits are more difficult than objects in nearly circular orbits. Problems in orbit determination, such as large residuals and non-convergence, arise for this class of objects, especially in the case of sparse observations. In addition, it might be difficult to select suitable initia

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Wilken, B., P. W. Daly, U. Mall, et al. "First results from the RAPID imaging energetic particle spectrometer on board Cluster." Annales Geophysicae 19, no. 10/12 (2001): 1355–66. http://dx.doi.org/10.5194/angeo-19-1355-2001.

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Abstract. The advanced energetic particle spectrometer RAPID on board Cluster can provide a complete description of the relevant particle parameters velocity, V , and atomic mass, A, over an energy range from 30 keV up to 1.5 MeV. We present the first measurements taken by RAPID during the commissioning and the early operating phases. The orbit on 14 January 2001, when Cluster was travelling from a perigee near dawn northward across the pole towards an apogee in the solar wind, is used to demonstrate the capabilities of RAPID in investigating a wide variety of particle populations. RAPID, with

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Wanderley, Fábio, Katia Cunha, Diogo Souto, et al. "Stellar Characterization and Radius Inflation of Hyades M-dwarf Stars from the APOGEE Survey." Astrophysical Journal 951, no. 2 (2023): 90. http://dx.doi.org/10.3847/1538-4357/acd4bd.

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Abstract We present a spectroscopic analysis of a sample of 48 M-dwarf stars (0.2 M ⊙ < M < 0.6 M ⊙) from the Hyades open cluster using high-resolution H-band spectra from the Sloan Digital Sky Survey/Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey. Our methodology adopts spectrum synthesis with LTE MARCS model atmospheres, along with the APOGEE Data Release 17 line list, to determine effective temperatures, surface gravities, metallicities, and projected rotational velocities. The median metallicity obtained for the Hyades M dwarfs is [M/H] = 0.09 ± 0.03 dex, indi

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Mackereth, J. Ted, Jo Bovy, and Ricardo P. Schiavon. "The age-metallicity structure of the Milky Way disc with APOGEE." Proceedings of the International Astronomical Union 13, S334 (2017): 265–68. http://dx.doi.org/10.1017/s1743921317006627.

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AbstractThe best way to trace back the history of star formation and mass assembly of the Milky Way disc is by combining chemical compositions, ages and phase-space information for a large number of disc stars. With the advent of large surveys of the stellar populations of the Galaxy, such data have become available and can be used to pose constraints on sophisticated models of galaxy formation. We use SDSS-III/APOGEE data to derive the first detailed 3D map of stellar density in the Galactic disc as a function of age, [Fe/H] and [α/Fe]. We discuss the implications of our results for the forma

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Darrouzet, F., J. De Keyser, P. M. E. Décréau, et al. "Analysis of plasmaspheric plumes: CLUSTER and IMAGE observations." Annales Geophysicae 24, no. 6 (2006): 1737–58. http://dx.doi.org/10.5194/angeo-24-1737-2006.

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Abstract. Plasmaspheric plumes have been routinely observed by CLUSTER and IMAGE. The CLUSTER mission provides high time resolution four-point measurements of the plasmasphere near perigee. Total electron density profiles have been derived from the electron plasma frequency identified by the WHISPER sounder supplemented, in-between soundings, by relative variations of the spacecraft potential measured by the electric field instrument EFW; ion velocity is also measured onboard these satellites. The EUV imager onboard the IMAGE spacecraft provides global images of the plasmasphere with a spatial

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Cesarsky, C. J., and M. F. Kessler. "The Infrared Space Observatory." International Astronomical Union Colloquium 123 (1990): 205–14. http://dx.doi.org/10.1017/s0252921100077046.

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AbstractThe Infrared Space Observatory (ISO), a fully approved and funded project of the European Space Agency (ESA), is an astronomical satellite, which will operate at wavelengths from 3–200 μm. ISO will provide astronomers with a unique facility of unprecedented sensitivity for a detailed exploration of the universe ranging from objects in the solar system right out to distant extragalactic sources. The satellite essentially consists of a large cryostat containing at launch about 2300 litres of superfluid helium to maintain the Ritchey-Chrétien telescope, the scientific instruments and the

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Lu, Yuxi (Lucy), Melissa K. Ness, Tobias Buck, Joel C. Zinn та Kathryn V. Johnston. "Similarities behind the high- and low-α disc: small intrinsic abundance scatter and migrating stars". Monthly Notices of the Royal Astronomical Society 512, № 2 (2022): 2890–910. http://dx.doi.org/10.1093/mnras/stac610.

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ABSTRACT The detailed age-chemical abundance relations of stars measure time-dependent chemical evolution. These trends offer strong empirical constraints on nucleosynthetic processes, as well as the homogeneity of star-forming gas. Characterizing chemical abundances of stars across the Milky Way over time has been made possible very recently, thanks to surveys like Gaia, APOGEE, and Kepler. Studies of the low-α disc have shown that individual elements have unique age–abundance trends and the intrinsic dispersion around these relations is small. In this study, we examine and compare the age di

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Filatyev, A. S., and O. V. Yanova. "The Optimal Control by the Thrust Vector of Air-Breathing Electric Propulsion to Maximize the Apogee Altitude of Orbit with an Ultra-Low Perigee." Cosmic Research 61, no. 2 (2023): 172–84. http://dx.doi.org/10.1134/s0010952522700137.

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Phillips, Siân G., Ricardo P. Schiavon, J. Ted Mackereth, et al. "APOGEE detection of N-rich stars in the tidal tails of Palomar 5." Monthly Notices of the Royal Astronomical Society 510, no. 3 (2021): 3727–33. http://dx.doi.org/10.1093/mnras/stab3532.

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ABSTRACT Recent results from chemical tagging studies using Apache Point Observatory Galactic Evolution Experiment data suggest a strong link between the chemical abundance patterns of stars found within globular clusters (GC), and chemically peculiar populations in the Galactic halo field. In this paper, we analyse the chemical compositions of stars within the cluster body and tidal streams of Palomar 5, a GC that is being tidally disrupted by interaction with the Galactic gravitational potential. We report the identification of nitrogen-rich (N-rich) stars both within and beyond the tidal ra

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Дронь, Николай Михайлович, Кирилл Валерьевич Коростюк, Александр Вячеславович Голубек, Людмила Григорьевна Дубовик та Алексей Владимирович Кулик. "ОЦЕНКА ВОЗМОЖНОСТЕЙ ПРИМЕНЕНИЯ СУБОРБИТАЛЬНЫХ РАКЕТ-НОСИТЕЛЕЙ ДЛЯ ВЫВЕДЕНИЯ СРЕДСТВ УВОДА ОБЪЕКТОВ КОСМИЧЕСКОГО МУСОРА С НИЗКИХ ОКОЛОЗЕМНЫХ ОРБИТ". Aerospace technic and technology, № 4 (28 серпня 2020): 60–65. http://dx.doi.org/10.32620/aktt.2020.4.07.

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The article is devoted to an actual problem of clearing of low earth orbits from space objects of a technogenic origin. Existing versions of struggle against space debris, in particular, removal of technogenic objects with help of the special means for deorbiting delivered into a target orbit by launch vehicles that are especially actual for bulky space debris are considered. Recognizing that the ascent of such means for deorbiting by orbital launch vehicles demands large financial expenses, for an increase of efficiency of delivery the means for deorbiting on a low earth orbit widely known su

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Гордиенко, Е. С., А. В. Симонов та П. Е. Розин. "Об одном замечательном свойстве траекторий перелёта КА Земля – Луна с использованием высокоэллиптических орбит вокруг Земли". Вестник НПО им. С.А. Лавочкина, № 1(67) (11 березня 2025): 72–80. https://doi.org/10.26162/ls.2025.67.1.008.

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Рассматривается выведение космического аппарата на низкую круговую полярную орбиту искусственного спутника Луны высотой 100 км, которую можно использовать как для наблюдения за поверхностью Луны, так и для последующей посадки на неё. В работе исследуются схемы «простого» прямого перелёта и прямого перелёта Земля – Луна с использованием двух промежуточных высокоэллиптических орбит КА вокруг Земли с радиусами апогея ~275–360 тыс. км. Приводятся численные и графические результаты. The article covers SC injection into low circular polar Moon satellite orbit of 100 km altitude which can be used bot

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Queiroz, A. B. A., C. Chiappini, A. Perez-Villegas, et al. "The Milky Way bar and bulge revealed by APOGEE and Gaia EDR3." Astronomy & Astrophysics 656 (December 2021): A156. http://dx.doi.org/10.1051/0004-6361/202039030.

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We investigate the inner regions of the Milky Way using data from APOGEE and Gaia EDR3. Our inner Galactic sample has more than 26 500 stars within |XGal|< 5 kpc, |YGal|< 3.5 kpc, |ZGal|< 1 kpc, and we also carry out the analysis for a foreground-cleaned subsample of 8000 stars that is more representative of the bulge–bar populations. These samples allow us to build chemo-dynamical maps of the stellar populations with vastly improved detail. The inner Galaxy shows an apparent chemical bimodality in key abundance ratios [α/Fe], [C/N], and [Mn/O], which probe different enrichment timesc

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Yeager, K. E., J. Eberle, and M. Cuntz. "On the ejection of Earth-mass planets from the habitable zones of the solar twins HD 20782 and HD 188015." International Journal of Astrobiology 10, no. 1 (2010): 1–13. http://dx.doi.org/10.1017/s1473550410000145.

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AbstractWe provide a detailed statistical study of the ejection of fictitious Earth-mass planets from the habitable zones of the solar twins HD 20782 and HD 188015. These systems possess a giant planet that crosses into the stellar habitable zone, thus effectively thwarting the possibility of habitable terrestrial planets. In the case of HD 188015, the orbit of the giant planet is essentially circular, whereas in the case of HD 20782, it is extremely elliptical. As starting positions for the giant planets, we consider both the apogee and perigee positions, whereas the starting positions of the

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Long, Cheng-Yu, Chun-Shuo Hsu, Mei-Yu Jang, Cheng-Min Liu, Po-Hui Chiang, and Eing-Mei Tsai. "Comparison of clinical outcome and urodynamic findings using “Perigee and/or Apogee” versus “Prolift anterior and/or posterior” system devices for the treatment of pelvic organ prolapse." International Urogynecology Journal 22, no. 2 (2010): 233–39. http://dx.doi.org/10.1007/s00192-010-1262-6.

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Lian, Jianhui, Gail Zasowski, Sten Hasselquist, et al. "Quantifying radial migration in the Milky Way: inefficient over short time-scales but essential to the very outer disc beyond ∼15 kpc." Monthly Notices of the Royal Astronomical Society 511, no. 4 (2022): 5639–55. http://dx.doi.org/10.1093/mnras/stac479.

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ABSTRACT Stellar radial migration plays an important role in reshaping a galaxy’s structure and the radial distribution of stellar population properties. In this work, we revisit reported observational evidence for radial migration and quantify its strength using the age–[Fe/H] distribution of stars across the Milky Way with APOGEE data. We find a broken age–[Fe/H] relation in the Galactic disc at r &gt; 6 kpc, with a more pronounced break at larger radii. To quantify the strength of radial migration, we assume stars born at each radius have a unique age and metallicity, and then decompose

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