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Journal articles on the topic 'Ephemerides'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Standish, E. M. "The Dynamical Reference Frame." Symposium - International Astronomical Union 166 (1995): 109–16. http://dx.doi.org/10.1017/s0074180900227939.

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Planetary and lunar ephemerides continue to improve in accuracy as they continue to be adjusted to newer and more accurate observational data. An additional improvement will be that of the orientation of the ephemerides; in the future, the ephemerides produced at JPL will be based upon the reference frame of the radio source catalogues. Recent planetary observations have been made directly with respect to the radio reference frame, and these observations have shown a satisfying degree of absolute accuracy and internal consistency; they enable the automatic orientation of the ephemerides onto t

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2

Xi, X. J., and A. Vienne. "Analytical representation for ephemeride with short time spans." Astronomy & Astrophysics 635 (March 2020): A91. http://dx.doi.org/10.1051/0004-6361/201937148.

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Context. The ephemerides of natural satellites resulting from numerical integration have a very good precision on the fitting to recent observations, in a limited interval. Meanwhile, synthetic ephemerides like the Théorie Analytique des Satellites de Saturne (TASS) by Vienne and Duriez describe in detail the dynamical system by a representation based on the combinations of the proper frequencies. Some theoretical studies need to have both advantages. For example, to study the rotation of Titan, one needs to know the representation of its longitude. Aims. We aim to use these two types of ephem

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Lee, H. S., W. A. Wan Aris, T. A. Musa, and A. Ahmad. "ASSESSING EFFICIENCY OF GPS EPHEMERIDES IN DIFFERENT REGION USING PRECISE POINT POSITIONING." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLVIII-4/W6-2022 (February 7, 2023): 195–99. http://dx.doi.org/10.5194/isprs-archives-xlviii-4-w6-2022-195-2023.

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Abstract. Precise Point Positioning (PPP) is a technique that process Global Positioning System (GPS) observation that can achieve sub-decimetre accuracy. Precise ephemerides that contain satellite clock and position plays a vital role in minimising orbital and clock error in PPP. This study hypothesize that the efficiency of ephemerides varies across region, influenced by the density of stations involved in generating the ephemerides. GPS observations from stations in five different regions were processed using PPP technique by using RTKLIB. Four types of ephemerides were used namely broadcas

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Deng, Yongtao, and Shuanggen Jin. "Effect of Ephemeris on Pulsar Timing and Navigation Accuracy Based on X-ray Pulsar Navigation-I Data." Universe 8, no. 7 (2022): 360. http://dx.doi.org/10.3390/universe8070360.

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Solar system ephemeris is very important for pulsar timing and navigation. In order to explore the effect of different precision ephemerides on X-Ray pulsar timing and navigation, the differences between timing and navigation results with four JPL Development Ephemerides based on the data of x-ray pulsar navigation-I (XPNAV-I) were compared and analyzed in this paper. For pulsar timing, the ephemeris has a systematic effect on time scale conversion (nanosecond difference), light-travel delay (millisecond difference) and timing residuals (microsecond difference), and the pulse profile phase can

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Standish, E. Myles. "Numerical planetary and lunar ephemerides: present status, precision and accuracies." Symposium - International Astronomical Union 114 (1986): 71–83. http://dx.doi.org/10.1017/s0074180900148016.

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The Ephemeris Development Program has been in existence for nearly 20 years at JPL, providing high precision present-day knowledge of the positions of the moon and major planets. The resultant ephemerides are used extensively in the navigation of spacecraft and in the reduction of astrometric observations. They also provide a key element in the testing of various theories of gravitation and a means for the determination of various relevant astronomical constants. The ephemerides and the process of creating them are both shown to be viable tools for the measurement of various gravitational effe

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Fukushima, Toshio, George H. Kaplan, George A. Krasinsky, et al. "COMMISSION 4: EPHEMERIDES." Proceedings of the International Astronomical Union 4, T27A (2008): 5–11. http://dx.doi.org/10.1017/s1743921308025234.

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JPL planetary ephemeris development has been very active assimilating measurements from current planetary missions and supporting future missions. The NASA Mars Science Laboratory (MSL) mission with launch in 2009 requires knowledge of the Earth and Mars ephemerides with 30m accuracy. By comparison, the accuracy of the Mars ephemeris in the widely used DE405 ephemeris was about 3 km. Meeting the MSL needs requires an ongoing program of range and very-long baseline interferometry measurements of Mars orbiting spacecraft. The JPL ephemeris DE421 was released three months before the landing of th

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Emelyanov, N. V., M. I. Varfolomeev, and V. Lainey. "New ephemerides of outer planetary satellites." Monthly Notices of the Royal Astronomical Society 512, no. 2 (2022): 2044–50. http://dx.doi.org/10.1093/mnras/stac586.

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ABSTRACT Ephemerides of planetary satellites require regular updates to take into account new observations of the satellites. Such revision has been all the more necessary in the case of outer planetary satellites, since a number of new moons have been discovered recently. Thus, we present updated versions of the ephemerides of the outer planetary satellites. The problem and the methodology for estimating ephemeris accuracy are discussed. Comparison with the Jet Propulsion Laboratory (JPL) ephemerides proves that the accuracy depends largely on the distribution of the observations. We give exa

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Krasinsky, George, Toshio Fukushima, J. Chapront, et al. "Commission 4: Ephemerides." Proceedings of the International Astronomical Union 1, T26A (2005): 3–6. http://dx.doi.org/10.1017/s1743921306004285.

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JPL continues to be active in creating ephemerides in support of spacecraft navigation as well as various other functions. Many of the products are available on web sites: (a) “Horizons”, the interactive web site, updated on an hourly basis, is located at http://ssd.jpl.nasa.gov. As of August, 2005, it contains orbital elements and ephemerides for the sun and 9 planets, 150 natural satellites (including the Moon), 291, 655 asteroids, 1631 comets, and 34 Spacecraft. Horizons uses the full precision of the JPL DE405.(b)JPL's Planetary and Lunar Ephemerides in “export” format are available via FT

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Mariani, V., O. Minazzoli, A. Fienga, J. Laskar, and M. Gastineau. "Bayesian test of Brans–Dicke theories with planetary ephemerides: Investigating the strong equivalence principle." Astronomy & Astrophysics 682 (February 2024): A175. http://dx.doi.org/10.1051/0004-6361/202348082.

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Aims. We are testing the Brans–Dicke class of scalar tensor theories with planetary ephemerides. Methods. In this work, we apply our recently proposed Bayesian methodology to the Brans–Dicke case, with an emphasis on the issue of the strong equivalence principle (SEP). Results. We use an MCMC approach coupled to full, consistent planetary ephemeris construction (from point-mass body integration to observational fit) and compare the posterior distributions obtained with and without the introduction of potential violations of the SEP. Conclusions. We observe a shift in the confidence levels of t

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Morando, B., P. K. Seldelmann, V. K. Abalakin, et al. "4. Ephemerides (Ephemerides)." Transactions of the International Astronomical Union 20, no. 1 (1988): 1–6. http://dx.doi.org/10.1017/s0251107x00006854.

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This report covers the period from 1 July 1984 to 30 June 1987. The ephemerides that have been published during this period have made use of the new system of astronomical constants adopted at the XVIth General Assembly of the lAU in Grenoble. Yet some difficulties have arisen because of the lack of catalogues or maps of the heavens established for the epoch J2000.0. This is awkward for observers of comets and minor planets and, for that reason, Commission 20 decided, at the New Delhi meeting of lAU that there would be a gradual introduction of the J2000.0 system as far as those bodies are con

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Battley, Matthew P., Michelle Kunimoto, David J. Armstrong, and Don Pollacco. "Revisiting theKeplerfield withTESS: Improved ephemerides usingTESS2 min data." Monthly Notices of the Royal Astronomical Society 503, no. 3 (2021): 4092–104. http://dx.doi.org/10.1093/mnras/stab701.

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ABSTRACTUp to date planet ephemerides are becoming increasingly important as exoplanet science moves from detecting exoplanets to characterizing their architectures and atmospheres in depth. In this work, ephemerides are updated for 22 Kepler planets and 4 Kepler planet candidates, constituting all Kepler planets and candidates with sufficient signal to noise in the TESS 2 min data set. A purely photometric method is utilized here to allow ephemeris updates for planets even when they do not posses significant radial velocity data. The obtained ephemerides are of very high precision and at leas

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Standish, E. M., and X. X. Newhall. "New accuracy levels for solar system ephemerides." Symposium - International Astronomical Union 172 (1996): 29–36. http://dx.doi.org/10.1017/s0074180900127081.

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DE403/LE403 is the latest JPL Planetary and Lunar Ephemeris. It represents a number of changes and improvements to previous JPL ephemerides: the reference frame is now that of the IERS, newer and more accurate observations are used in the adjustment process, some of the data reduction techniques have been refined, and improved dynamical modeling has been incorporated into the equations of motion. As a result, the internal accuracy of the inner four planets has been improved. Further, various measurements accurately tie Jupiter onto the IERS Reference Frame. In the future, use of CCD measuremen

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Pang, Kevin D., and Kevin K. Yau. "The need for more accurate 4000-year ephemerides, based on lunar and spacecraft ranging, ancient eclipse and planetary data." Symposium - International Astronomical Union 172 (1996): 113–16. http://dx.doi.org/10.1017/s0074180900127202.

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Long planetary and lunar ephemerides like the JPL DE102 and LE51 (Newhall et al., 1983) and the Bureau des Longitudes VSOP (Bretagnon, 1982) and ELP (Chapront-Touze and Chapront, 1983) have enabled more positive ancient eclipse, planetary and cometary identifications, which have in turn refined ephemerides, e.g., the reconstruction of the orbit of comets Halley and Swift-Tuttle (Yeomans and Kiang, 1981; and Yau et al., 1994). The data used to initialize DE102 are pre-1977. Much more observational data have been collected since. The lunar ephemeris has also been improved. The secular lunar acce

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Qiao, Jing, Wu Chen, Shengyue Ji, and Duojie Weng. "Accurate and Rapid Broadcast Ephemerides for Beidou-Maneuvered Satellites." Remote Sensing 11, no. 7 (2019): 787. http://dx.doi.org/10.3390/rs11070787.

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The geostationary earth orbit (GEO) and inclined geosynchronous orbit (IGSO) satellites of the Beidou navigation satellite system are maneuvered frequently. The broadcast ephemeris can be interrupted for several hours after the maneuver. The orbit-only signal-in-space ranging errors (SISREs) of broadcast ephemerides available after the interruption are over two times larger than the errors during normal periods. To shorten the interruption period and improve the ephemeris accuracy, we propose a two-step orbit recovery strategy based on a piecewise linear thrust model. The turning points of the

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15

Fukushima, Toshio. "Commission 4: Ephemerides (Ephemerides)." Transactions of the International Astronomical Union 25, no. 2 (2007): 65–66. http://dx.doi.org/10.1017/s0251107x00026481.

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Chapront, J., G. A. Krasinsky, V. K. Abalakin, et al. "Commission 4: Ephemerides: (Ephemerides)." Transactions of the International Astronomical Union 25, no. 1 (2002): 11–14. http://dx.doi.org/10.1017/s0251107x00001231.

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Lin, Wenliang, Jian Yi, Tong Wang, et al. "A Low Earth Orbit Satellite-Orbit Extrapolation Method Based on Multi-Satellite Ephemeris Coordination and Multi-Stream Fractional Autoregressive Integrated Moving Average." Aerospace 11, no. 9 (2024): 746. http://dx.doi.org/10.3390/aerospace11090746.

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The low Earth orbit (LEO) satellite internet network (LEO-SIN) has become a heated issue for the next generation of mobile communications, serving as a crucial means to achieve global wide-area broadband coverage and, especially, mobile phone directly to satellite cell (MPDTSC) communication. The ultra-high-speed movement of LEO satellites relative to the Earth results in serious Doppler effects, leading to signal de-synchronization at the user end (UE), and relative high-speed motion leading to frequent satellite handovers. Satellite ephemeris, which indicates the satellite’s position, has th

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Eroshkin, G. I., N. I. Glebova, M. A. Fursenko, and A. A. Trubitsina. "Some Aspects of Constructing Long Ephemerides of the Sun, Major Planets and the Moon: Ephemeris AE95." International Astronomical Union Colloquium 165 (1997): 245–50. http://dx.doi.org/10.1017/s0252921100046625.

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The construction of long-term numerical ephemerides of the Sun, major planets and the Moon is based essentially on the high-precision numerical solution of the problem of the motion of these bodies and polynomial representation of the data. The basis of each ephemeris is a mathematical model describing all the main features of the motions of the Sun, major planets, and Moon. Such mathematical model was first formulated for the ephemerides DE/LE and was widely applied with some variations for several national ephemeris construction. The model of the AE95 ephemeris is based on the DE200/LE200 ep

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Tang, K., Y. Z. Song, K. X. Shen, et al. "The orbit of Triton with new precise observations and the INPOP19a ephemeris." Astronomy & Astrophysics 641 (September 2020): A108. http://dx.doi.org/10.1051/0004-6361/202038556.

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Aims. The Gaia catalogue brings new opportunities and challenges to high-precision astronomy and astrometry. The precision of data reduction is therefore improved by a large number of reference stars with high-precision positions and proper motions. Numerous precise positions for Triton are obtained from the latest observations using the Gaia catalogue. Furthermore, the new INPOP19a planetary ephemeris, which also fits the observations from the Gaia Data Release 2, has recently become available. In this paper, a new orbit of Triton is calculated using the latest precise charge-coupled device (

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Yeomans, Donald K. "Comet and Asteroid Ephemerides for Spacecraft Encounters." International Astronomical Union Colloquium 165 (1997): 1–12. http://dx.doi.org/10.1017/s0252921100046315.

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AbstractTo a significant degree, the success of spacecraft missions to comets and asteroids depends upon the accuracy of the target body ephemerides. In turn, accurate ephemerides depend upon the quality of the astrometric data set used in determining the object’s orbit and the accuracy with which the target body’s motion can be modelled. Using error analyses studies of the target bodies for the NEAR, Muses-C, Clementine 2, Stardust, and Rosetta missions, conclusions are drawn as to how to minimize target body position uncertainties at the times of encounter. In general, these uncertainties wi

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21

Standish, E. M. "Celestial Reference Frames: Definitions and Accuracies." Symposium - International Astronomical Union 129 (1988): 309–15. http://dx.doi.org/10.1017/s0074180900134813.

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The determination of a specific catalogue or ephemeris reference frame is a highly over-determined problem, depending on the particular selection of which coordinates, which objects and at what time(s) the determination is made. The consistency which various determinations exhibit is dependent upon the accuracy of the catalogue or ephemeris itself. This paper discusses the accuracies of the three most prominent celestial reference frames: stellar catalogues, the lunar and planetary ephemerides and the radio source catalogues.The FK4 stellar catalogue contains known systematic errors amounting

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Capistrano, Abraão J. S., Joice A. M. Penagos, and Manuel S. Alárcon. "Heuristic Approach on Anomalous Apsidal Precession of Planets." International Journal of Modern Physics: Conference Series 45 (January 2017): 1760074. http://dx.doi.org/10.1142/s2010194517600746.

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In this paper we study the anomalous movement of planet precession as compared with different observational data from Ephemerides of the Planets and the Moon (EPM2008 and EPM2011) and the Planetary and Lunar Ephemeris (INPOP10a). Using a heuristic methodology we obtain a very close results to observations.

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Thygesen, Erica, Joseph E. Rodriguez, Zoë L. de Beurs, et al. "The K2 and TESS Synergy. III. Search and Rescue of the Lost Ephemeris for K2's First Planet." Astronomical Journal 168, no. 4 (2024): 161. http://dx.doi.org/10.3847/1538-3881/ad60bf.

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Abstract K2-2 b/HIP 116454 b, the first exoplanet discovery by K2 during its Two-Wheeled Concept Engineering Test, is a sub-Neptune (2.5 ± 0.1 R ⊕, 9.7 ± 1.2 M ⊕) orbiting a relatively bright (K S = 8.03) K-dwarf star on a 9.1 day period. Unfortunately, due to a spurious follow-up transit detection and ephemeris degradation, the transit ephemeris for this planet was lost. In this work, we recover and refine the transit ephemeris for K2-2 b, showing a ∼40σ discrepancy from the discovery results. To accurately measure the transit ephemeris and update the parameters of the system, we jointly fit

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Standish, E. M. "Fundamental Arguments of the Current Nutation Theory: Dynamical Reference Frame." Highlights of Astronomy 11, no. 1 (1998): 168. http://dx.doi.org/10.1017/s1539299600020347.

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The latest JPL planetary and lunar ephemerides, DE405, are now referenced to the ICRF with an accuracy of about 1 mas. This has been accomplished mainly by fitting the ephemerides to 18 VLBI observations of the Magellan Spacecraft in orbit around Venus, 1990-1994, and to 2 VLBI observations of the Phobos Spacecraft in its approach to Mars, 1989. The orientation of DE405 is discussed in more detail elsewhere in this volume (Standish, 1997). Since all of the parameters of the inner solar system are now determined to 1 mas or better, one should be able to extract numerically the fundamental argum

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Wang, Wenqin, Zixin Zhang, Zhangliang Chen, Yonghao Wang, Cong Yu, and Bo Ma. "Long-term Variations in the Orbital Period of Hot Jupiters from Transit-timing Analysis Using TESS Survey Data." Astrophysical Journal Supplement Series 270, no. 1 (2024): 14. http://dx.doi.org/10.3847/1538-4365/ad0847.

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Abstract Many hot Jupiters may experience orbital decays, which are manifested as long-term transit-timing variations. We have analyzed 7068 transits from the Transiting Exoplanet Survey Satellite (TESS) for a sample of 326 hot Jupiters. These new mid-transit-time data allow us to update ephemerides for these systems. By combining the new TESS transit-timing data with archival data, we searched for possible long-term variations in the orbital period in these hot Jupiters using a linear and a quadratic ephemeris model. We identified 26 candidates that exhibit possible long-term variations of th

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Seidelmann, P. K. "Evolution of Ephemerides Representation and Diffusion." Symposium - International Astronomical Union 172 (1996): 331–38. http://dx.doi.org/10.1017/s0074180900127627.

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There has been, and continues to be, a close interaction between celestial mechanics used for the generation of ephemerides, mathematical techniques, and computer technology. As the computer capabilities of the ephemerides offices and the users of ephemerides have improved, the methods of determining and the accuracies of ephemerides have changed and the medium and representation of the ephemerides provided to the user have evolved.Ephemerides have been provided in the form of theories, tables, tabulations, polynomials, graphics, and subroutines by means of the printed page, punched cards, mag

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Robustelli, Umberto, and Giovanni Pugliano. "Galileo Single Point Positioning Assessment Including FOC Satellites in Eccentric Orbits." Remote Sensing 11, no. 13 (2019): 1555. http://dx.doi.org/10.3390/rs11131555.

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On August 2016, the Milena (E14) and Doresa (E18) satellites started to broadcast ephemeris in navigation message for testing purposes. As the Galileo constellation is not yet complete. It is very important to have two more satellites available since the position accuracy increases as the number of visible satellites increases. In this article, we examine how the inclusion of the Milena (E14) and Doresa (E18) satellites impacts the position accuracy. The analysis was carried out on 20 days of 1-Hz observations collected by a receiver placed in YEL2IGS (International GNSS service) station. Two

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Jones, Ellen. "Ephemerides." Moreana 22 (Number 87-8, no. 3-4 (1985): 97–98. http://dx.doi.org/10.3366/more.1985.22.3-4.30.

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Sander-Regier, Renate. "Ephemerides." Moreana 23 (Number 89), no. 1 (1986): 99–102. http://dx.doi.org/10.3366/more.1986.23.1.25.

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Sander-Regier, Renate. "Ephemerides." Moreana 23 (Number 91-9, no. 3-4 (1986): 88–92. http://dx.doi.org/10.3366/more.1986.23.3-4.24.

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Marc’hadour, Germain. "Ephemerides." Moreana 23 (Number 91-9, no. 3-4 (1986): 93–96. http://dx.doi.org/10.3366/more.1986.23.3-4.25.

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Marc’hadour, Germain. "Ephemerides." Moreana 23 (Number 91-9, no. 3-4 (1986): 206–11. http://dx.doi.org/10.3366/more.1986.23.3-4.56.

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Marc’hadour, Germain. "Ephemerides." Moreana 25 (Number 98-9, no. 2-3 (1988): 237–38. http://dx.doi.org/10.3366/more.1988.25.2-3.56.

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Standish, E. M., X. X. Newhall, J. G. Williams, and J. O. Dickey. "The reference frame of the ephemerides." Symposium - International Astronomical Union 128 (1988): 49–53. http://dx.doi.org/10.1017/s0074180900119254.

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Complete ephemerides of the moon and the four inner planets could be created solely from ranging data alone. Such ephemerides would then be independent from any outside astronomical reference system, and, therefore, would define their own unique reference frame. In fact, this is nearly the case with present-day ephemerides; the accuracy of the ranging data tends to dominate most of the least squares adjustment.This paper outlines the process of creating the lunar and planetary ephemerides along with the orientation of the ephemerides onto the dynamical equinox. The resulting accuracies of thes

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Abdel Aziz, Khaled Mahmoud, and Loutfia Elsonbaty. "EFFECT OF USING DIFFERENT SATELLITE EPHEMERIDES ON GPS PPP AND POST PROCESSING TECHNIQUES." Geodesy and cartography 47, no. 3 (2021): 104–10. http://dx.doi.org/10.3846/gac.2021.13762.

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The orbital error is one of the errors in GPS which affect the accuracy of GPS positioning. In this research GPS broadcast, ultra-rapid, rapid and precise satellite ephemerides are used for processing different baseline lengths among some CORS stations by using the Trimble Business Center software (TBC) and different satellite ephemerides (NRCan ultra-rapid, NRCan rapid and IGS final) are tested in CSRS-PPP online application at the same CORS stations. In this research, when using TBC software for processing the different baseline lengths by using the different satellite ephemerides and compar

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Coma, J. C., M. Lara, and T. J. López Moratalla. "Fast evaluation of ephemerides by polynomial approximation in the Chebyshev norm." Symposium - International Astronomical Union 172 (1996): 345–46. http://dx.doi.org/10.1017/s0074180900127640.

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Normally the planetary and satellite ephemerides are provided in tabular form, where the user interpolates between points in order to obtain the ephemerides. There are other methods of providing ephemerides by means of polynomial representations. The user is supplied with the coefficients of a set of polynomials which allow him a fast ephemerides evaluation.

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Standish, E. M. "Dynamical Reference Frame — Current Relevance and Future Prospects." International Astronomical Union Colloquium 180 (March 2000): 120–26. http://dx.doi.org/10.1017/s025292110000021x.

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AbstractPlanetary and lunar ephemerides are no longer used for the determination of inertial space. Instead, the new fundamental reference frame, the ICRF, is inherently less susceptible to extraneous, non-inertial rotations than would be a dynamical reference frame determined by the ephemerides. Consequently, the ephemerides are now adjusted onto the ICRF, and they are fit to two modern, accurate observational data types: ranging (radar, lunar laser, spacecraft) and VLBI (of spacecraft near planets).The uncertainties remaining in the inner planet ephemerides are on the order of 1 kilometer, b

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Di Ruscio, A., A. Fienga, D. Durante, L. Iess, J. Laskar, and M. Gastineau. "Analysis of Cassini radio tracking data for the construction of INPOP19a: A new estimate of the Kuiper belt mass." Astronomy & Astrophysics 640 (July 28, 2020): A7. http://dx.doi.org/10.1051/0004-6361/202037920.

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Context. Recent discoveries of new trans-Neptunian objects have greatly increased the attention by the scientific community to this relatively unknown region of the solar system. The current level of precision achieved in the description of planet orbits has transformed modern ephemerides in the most updated tools for studying the gravitational interactions between solar system bodies. In this context, the orbit of Saturn plays a primary role, especially thanks to Cassini tracking data collected during its 13-year mission around the ringed planet. Planetary ephemerides are currently mainly bui

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Fienga, A., L. Bigot, D. Mary, et al. "Evolution of INPOP planetary ephemerides and Bepi-Colombo simulations." Proceedings of the International Astronomical Union 15, S364 (2021): 31–51. http://dx.doi.org/10.1017/s1743921321001277.

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AbstractWe give here a detailed description of the latest INPOP planetary ephemerides INPOP20a. We test the sensitivity of the Sun oblateness determination obtained with INPOP to different models for the Sun core rotation. We also present new evaluations of possible GRT violations with the PPN parameters β, γ and . With a new method for selecting acceptable alternative ephemerides we provide conservative limits of about 7.16 × 10-5 and 7.49 × 10-5 for β-1 and γ-1 respectively using the present day planetary data samples. We also present simulations of Bepi-Colombo range tracking data and their

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Standish, E. M. "Linking the Dynamical Reference frame to the ICRF." Highlights of Astronomy 11, no. 1 (1998): 310–12. http://dx.doi.org/10.1017/s1539299600020839.

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AbstractThe latest JPL planetary and lunar ephemerides, DE405, are referenced to the International Celestial Reference Frame (ICRF) with an accuracy that approaches 1 mas for the four innermost planets, the sun, and the moon. This has been accomplished mainly by 18 VLBI observations of the Magellan Spacecraft in orbit around Venus. The ephemeris of Jupiter, however, is not well-determined since the various observations are not consistent within each other. The outer four planets continue to rely almost entirely upon optical observations; their ephemeris uncertainties lie in the 100-200 mas ran

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Marc’hadour, Germain. "Ephemerides moreanae." Moreana 24 (Number 95-9, no. 3-4 (1987): 207–16. http://dx.doi.org/10.3366/more.1987.24.3-4.50.

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O’Neill, Patrick, and Germain Marc’hadour. "Ephemerides Moreanae." Moreana 27 (Number 103), no. 3 (1990): 101–12. http://dx.doi.org/10.3366/more.1990.27.3.22.

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Bejczy, István, and Germain Marc’hadour. "Ephemerides Morerasmiennes." Moreana 29 (Number 110), no. 2 (1992): 96. http://dx.doi.org/10.3366/more.1992.29.2.20.

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Lederle, T., B. L. Morando, V. K. Abalakin, et al. "4. Ephemerides." Transactions of the International Astronomical Union 19, no. 1 (1985): 1–6. http://dx.doi.org/10.1017/s0251107x00006052.

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The period of this Report includes 1984 January 1, the date which was probably the most drastic caesura in the history of astronomical almanacs. It seemed, therefore, appropriate to concentrate here to the general aspects rather than to describe the works going on at the particular almanac offices. It is, however, hoped that the past years with their developments and changes will be followed by a period of consolidation and continuity. This would be also of great benefit for the users of the almanacs who still need some time for getting accustomed to so many innovations.

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Sharp, Philip W. "High order explicit Runge-Kutta pairs for ephemerides of the Solar System and the Moon." Journal of Applied Mathematics and Decision Sciences 4, no. 2 (2000): 183–92. http://dx.doi.org/10.1155/s1173912600000146.

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Numerically integrated ephemerides of the Solar System and the Moon require very accurate integrations of systems of second order ordinary differential equations. We present a new family of 8-9 explicit Runge-Kutta pairs and assess the performance of two new 8-9 pairs on the equations used to create the ephemeris DE102. Part of this work is the introduction of these equations as a test problem for integrators of initial value ordinary differential equations.

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Belikov, M. L., V. N. Boyko, N. I. Glebova, et al. "The Main Stages of the Construction of AE89—The Numerical Ephemeris of the Planets and the Moon." Symposium - International Astronomical Union 141 (1990): 183–85. http://dx.doi.org/10.1017/s0074180900086733.

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The realization of theoretical and applied researches in the domain of ephemeris astronomy, connected with analysis of precision of existing planetary and lunar theories, the construction of an inertial coordinate system and investigation of physical properties of space-time, necessitated the elaboration in ITA of the numerical theory of the motion of heavenly bodies suitable for calculation of high-precision ephemerides at large time-spans, and fit also for the maintenance of space experiments.

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Fukushima, Toshio. "Time ephemeris and general relativistic scale factor." Proceedings of the International Astronomical Union 5, S261 (2009): 89–94. http://dx.doi.org/10.1017/s1743921309990202.

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AbstractTime ephemeris is the location-independent part of the transformation formula relating two time coordinates such as TCB and TCG (Fukushima 1995). It is computed from the corresponding (space) ephemerides providing the relative motion of two spatial coordinate origins such as the motion of geocenter relative to the solar system barycenter. The time ephemerides are inevitably needed in conducting precise four dimensional coordinate transformations among various spacetime coordinate systems such as the GCRS and BCRS (Soffelet al. 2003). Also, by means of the time average operation, they a

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Pitjeva, E. V. "Use of optical and radio astrometric observations of planets, satellites and spacecraft for ephemeris astronomy." Proceedings of the International Astronomical Union 3, S248 (2007): 20–22. http://dx.doi.org/10.1017/s1743921308018565.

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AbstractDifferent types of radiometric observations of planets and spacecraft, as well as optical data used for constructing modern high-precision planet ephemerides are presented. New mass values for planets and asteroids are given. The IAA RAS EPM ephemerides (Ephemerides ofPlanets and theMoon) are the basis for the Russian “Astronomical Yearbook” and are used in the navigation program “GLONASS” and the cosmic program “Phobos-Grunt”.

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Pitjeva, E. V. "EPM ephemerides and relativity." Proceedings of the International Astronomical Union 5, S261 (2009): 170–78. http://dx.doi.org/10.1017/s1743921309990342.

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AbstractIn the seventies of the last century the EPM ephemerides (Ephemerides of Planets and the Moon) of IAA RAS originated and have been developed since that time. These ephemerides are based upon relativistic equations of motion of celestial bodies and light rays and upon relativistic time scales. The updated model of EPM2008 includes the new values of planet masses and other constants, the improved dynamical model with adding Trans–Neptunian Objects and the expanded database (1913–2008). More than 260 parameters have been determined while improving the planetary part of EPM2008 to 550000 o

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Kokori, A., A. Tsiaras, B. Edwards, et al. "ExoClock Project. II. A Large-scale Integrated Study with 180 Updated Exoplanet Ephemerides." Astrophysical Journal Supplement Series 258, no. 2 (2022): 40. http://dx.doi.org/10.3847/1538-4365/ac3a10.

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Abstract The ExoClock project is an inclusive, integrated, and interactive platform that was developed to monitor the ephemerides of the Ariel targets to increase the mission efficiency. The project makes the best use of all available resources, i.e., observations from ground telescopes, midtime values from the literature, and finally, observations from space instruments. Currently, the ExoClock network includes 280 participants with telescopes capable of observing 85% of the currently known Ariel candidate targets. This work includes the results of ∼1600 observations obtained up to 2020 Decem

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