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Journal articles on the topic 'Astro Observatory (U.S.)'

Author: Grafiati

Published: 25 July 2024

Last updated: 28 July 2025

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1

Worley, Charles E., and Geoffrey G. Douglass. "Speckle Interferometry at the U. S. Naval Observatory." International Astronomical Union Colloquium 135 (1992): 583–85. http://dx.doi.org/10.1017/s0252921100007223.

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AbstractA new speckle interferometer began operation with the 66-cm refractor in Oct. 1990. The interferometer is an improved version of the one operated by CHARA at Georgia State University. We describe the instrument, its calibration, and first observational results.

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Schmidt, Richard E., and Steven J. Dick. "Meridian Circle Astrometry at the U. S. Naval Observatory." Cahiers François Viète, no. III-14 (June 1, 2023): 217–54. http://dx.doi.org/10.4000/cahierscfv.4086.

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Eglitis, Ilgmars, and Vitaly Andruk. "Astrometry and photometry of digitized plates of Baldone Schmidt telescope." Open Astronomy 30, no. 1 (2021): 12–23. http://dx.doi.org/10.1515/astro-2021-0002.

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Abstract During the 40-year photographic period of astronomical observations, the Baldone Astrophysical Observatory has accumulated more than 22,000 direct and 2,500 spectral images. In 2018, the digitization of direct astrophoto images with a resolution of 1200 dpi was completed. A processing methodology for obtaining the equatorial coordinates and photometric characteristics of the objects recorded in digitized astronegatives using the LINUX/MIDAS/ROMAFOT environment has been developed at the Main Astronomical Observatory of the National Academy of Sciences of Ukraine. Program package with s

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Sapozhnikov, Sergei, and Dana Kovaleva. "Application of clustering algorithm to wide stellar pairs for unsupervised search of parts of disrupting clusters." Open Astronomy 30, no. 1 (2021): 191–202. http://dx.doi.org/10.1515/astro-2021-0025.

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Abstract We introduce the application of the clustering algorithm to the preliminary compiled list of probable wide pairs of co-moving stars. The main aim of such development is a possibility of unsupervised blind search of coeval loose stellar structures over significant regions in space. Using Gaia EDR3 data, we investigated the application of the method to nearby region hosting recently discovered loose structures – tidal tails of Coma Ber star cluster and a nearby stellar group named Group X. We compare the results of straightforward clustering of stellar data with results of using our met

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Odaka, Hirokazu. "Hitomi X-ray Astronomy Satellite: Power of High-Resolution Spectroscopy." Proceedings of the International Astronomical Union 11, S322 (2016): 197–203. http://dx.doi.org/10.1017/s1743921316012084.

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AbstractHitomi (ASTRO-H) is an X-ray observatory developed by an international collaboration led by JAXA. An X-ray microcalorimeter onboard this satellite has opened a new window of high-resolution spectroscopy with an unprecedented energy resolution of 5 eV (FWHM) at 6 keV. The spacecraft was launched on February 17, 2016 from Tanegashima Island, Japan, and we completed initial operations including deployment of the hard X-ray imagers on the extensible optical bench. All scientific instruments had successfully worked until the sudden loss of the mission on March 26. We have obtained a spectru

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Long, Knox S. "Far Ultraviolet Observations of Dwarf Novae made with the Hopkins Ultraviolet Telescope." International Astronomical Union Colloquium 158 (1996): 233–41. http://dx.doi.org/10.1017/s0252921100038756.

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AbstractObservations with the Hopkins Ultraviolet Telescope on the Astro-1 and Astro-2 space shuttle missions have provided the first set of moderate (3 Å) resolution far ultraviolet (FUV) spectra of dwarf novae to include the wavelength range between Lyα and the Lyman limit. Important lines which are detected in the HUT spectra of dwarf novae in this wavelength range include S VI λλ933,945, C III λ977, O VI λλ1032,1038, P V λλ1118,1128 and C III λ1176, as well as the higher order Lyman lines. The observations confirm earlier IUE observations that two dwarf novae – U Gem and VW Hyi – have quie

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Martin, Frederick. "A Dresden Codex Eclipse Sequence: Projections for the Years 1970–1992." Latin American Antiquity 4, no. 1 (1993): 74–93. http://dx.doi.org/10.2307/972138.

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Data from the U. S. Naval Observatory annual astronomical almanacs (1970–1992) in “correlation” with the Maya Calendar Round (CR) sequence indicate that the Dresden Codex lunar table (51a-58b) very probably counted simultaneous sequences of both lunar and solar eclipses on the same set of day names. The contemporary sequence of day names in the CR and the astronomy consistent with it parallels Classic-period Maya observational experience between 9.16.0.0.0 and 9.17.0.0.0.

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Fan, Zhou, Gang Zhao, Wei Wang, et al. "The Stellar Abundances and Galactic Evolution Survey (SAGES). I. General Description and the First Data Release (DR1)." Astrophysical Journal Supplement Series 268, no. 1 (2023): 9. http://dx.doi.org/10.3847/1538-4365/ace04a.

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Abstract The Stellar Abundances and Galactic Evolution Survey (SAGES) of the northern sky is a specifically designed multiband photometric survey aiming to provide reliable stellar parameters with accuracy comparable to those from low-resolution optical spectra. It was carried out with the 2.3 m Bok telescope of Steward Observatory and three other telescopes. The observations in the u s and v s passband produced over 36,092 frames of images in total, covering a sky area of ∼9960 deg2. The median survey completenesses of all observing fields for the two bands are u s = 20.4 mag and v s = 20.3 m

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Canzian, B. "The 488,006,860 Sources in the USNO-A1.0 Catalog." Symposium - International Astronomical Union 179 (1998): 422–23. http://dx.doi.org/10.1017/s0074180900129201.

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The USNO-A1.0 catalog was generated from the U. S. Naval Observatory's digitization of the Palomar Observatory Sky Survey IOandEsurvey plates for fields with central declination δ ≥ −30°, and from the European Southern ObservatoryRand Science Research CouncilJsurvey plates for fields with central δ ≤–35° using the Precision Measuring Machine (PMM) located at the Flagstaff Station. It lists positions (α and δ in J2000) and brightnesses (red and blue magnitudes on the parent plate system) for all objects. A flag indicates if the entry also exists in GSC1.1.

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10

Zalinian, V. P., A. A. Karapetian, and H. M. Tovmassian. "Two-colour observations of spikes and flares by high time resolution." Symposium - International Astronomical Union 137 (1990): 33–34. http://dx.doi.org/10.1017/s0074180900187364.

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Observations of flare stars with high time resolution permit to register spiky type flares and also to study in detail bright curves of flares. In Byurakan observatory observations of EV Lac have been made with 0.1 s time resolution simultaneouslyin two filters “U” and “B” [1-3]. These observations permited to detect flares of a burst type (Fig.1) and also to reveil multipeak structure of long duration flares. It is necessary to stress that simultaneous observations in two colours increas appresiably the thrustworthiness of the registered spiky flares.

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Corbin, Thomas E., and Sean E. Urban. "A Catalog Of Reference Stars For New Reductions Of The Astrographic Catalog Plates." Symposium - International Astronomical Union 133 (1988): 287–92. http://dx.doi.org/10.1017/s0074180900139725.

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A high density reference star catalog is being compiled at the U. S. Naval Observatory for the purpose of making new reductions of the Astrographic Catalog. The catalog will be a replacement to the SAO catalog and will be derived from the large photographic catalogs and the modern meridian circle catalogs. It is expected that the final catalog will contain 346, 000 stars, with proper motion mean errors generally or less, on a uniform system, the data having been reduced first to FK4 and then to FK5 using the International Reference Stars (IRS).

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Yadav, Shiv Narayan, Walter Saurer, and Binil Aryal. "A Study of co-existence between the Hubble flow and the random alignments of spin vectors of SDSS galaxies." BIBECHANA 12 (December 19, 2014): 114–27. http://dx.doi.org/10.3126/bibechana.v12i0.11787.

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We present a study of spin vector orientation of 14,118 SDSS (Sloan Digital Sky Survey) galaxies having redshift in the range 0.19 to 0.20 (radial velocity 57,000 km/s to 60,000 km/s) with respect to galactic coordinate system using 7th data release (2008, October). These galaxies were observed through SDSS telescope of Apache Point Observatory located at New Mexico, USA. The photometric database is made available through our collaboration with institute of Astro-particle physics, Innsbruck University, Austria. We used the `Godlowskian' method to convert two dimensional data to three dimension

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Joyce, Simon R. G., John P. Pye, Jonathan D. Nichols, et al. "A Swift view of X-ray and UV radiation in the planet-forming T Tauri system PDS 70." Monthly Notices of the Royal Astronomical Society: Letters 491, no. 1 (2019): L56—L60. http://dx.doi.org/10.1093/mnrasl/slz169.

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ABSTRACT PDS 70 is a ∼5-Myr-old star with a gas and dust disc in which several protoplanets have been discovered. We present the first ultraviolet (UV) detection of the system along with X-ray observations taken with the Neil Gehrels Swift Observatory satellite. PDS 70 has an X-ray flux of 3.4 × 10−13 erg cm−2 s−1 in the 0.3–10.0 keV range, and UV flux (U band) of 3.5 × 10−13 erg cm−2 s−1 . At the distance of 113.4 pc determined from Gaia Data Release 2, this gives luminosities of 5.2 × 1029 and 5.4 × 1029 erg s−1, respectively. The X-ray luminosity is consistent with coronal emission from a r

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Corbin, Thomas E. "Computation of Compilation Catalogs." Symposium - International Astronomical Union 109 (1986): 75–86. http://dx.doi.org/10.1017/s0074180900076427.

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Currently the computation of mean positions and proper motions for the International Reference Stars (IRS) is hampered by large variations in the observational histories of the stars and lack of overlap between the magnitudes of the IRS and of the FK4. The poorest IRS observational histories are +60° to +80° in the north and −40° to −80° in the south. The much-needed extension of the fundamental system to the ninth magnitude will be made in the FK5. The Faint Fundamental Extension is currently being selected at the U. S. Naval Observatory. A proposed list of 1030 Faint Fundamental stars has be

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Bowen, Brent M. "Near-Neutral Surface Layer Turbulence at the Boulder Atmospheric Observatory Tower: Evidence of Increasing Vertical Turbulence with Height." Journal of Applied Meteorology 39, no. 5 (2000): 716–24. http://dx.doi.org/10.1175/1520-0450-39.5.716.

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Abstract Wind and turbulence profiles were analyzed during breezy, near-neutral conditions at the Boulder Atmospheric Observatory tower to quantify the effects of an abrupt 20- to 30-m increase in terrain located 3–5 km west of the tower. Results indicate that regional roughness length z0 is greatest and local z0 is smallest in sectors downwind of a long, shallow bluff, suggesting that distant, more complex, upwind terrain enhances horizontal turbulence but has little effect on local wind speed profiles. Turbulence parameter profiles are nearly constant up to 200 m above ground level (AGL), an

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Herrero-Illana, R., G. C. Privon, A. S. Evans, et al. "Molecular gas and dust properties of galaxies from the Great Observatories All-sky LIRG Survey." Astronomy & Astrophysics 628 (August 2019): A71. http://dx.doi.org/10.1051/0004-6361/201834088.

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We present IRAM-30 m Telescope 12CO and 13CO observations of a sample of 55 luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs) in the local universe. This sample is a subset of the Great Observatory All-Sky LIRG Survey (GOALS), for which we use ancillary multi-wavelength data to better understand their interstellar medium and star formation properties. Fifty-three (96%) of the galaxies are detected in 12CO, and 29 (52%) are also detected in 13CO above a 3σ level. The median full width at zero intensity (FWZI) velocity of the CO line emission is 661 km s−1, and ∼54% of the galaxies

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Booth, Rebecca A., Roland Kothes, Tom Landecker, et al. "A New Distance to the Supernova Remnant DA 530 Based on H i Absorption of Polarized Emission." Astrophysical Journal 941, no. 1 (2022): 17. http://dx.doi.org/10.3847/1538-4357/ac9cd9.

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Abstract Supernova remnants (SNRs) are significant contributors of matter and energy to the interstellar medium. Understanding the impact and the mechanism of this contribution requires knowledge of the physical size, energy, and expansion rate of individual SNRs, which can only come if reliable distances can be obtained. We aim to determine the distance to the SNR DA 530 (G93.3+6.9), an object of low surface brightness. To achieve this, we used the Dominion Radio Astrophysical Observatory Synthesis Telescope and the National Radio Astronomy Observatory Very Large Array to observe the absorpti

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Quirrenbach, A., P. J. Amado, J. A. Caballero, et al. "The CARMENES Survey: A Search for Terrestrial Planets in the Habitable Zones of M Dwarfs." Proceedings of the International Astronomical Union 8, S293 (2012): 177–82. http://dx.doi.org/10.1017/s1743921313012787.

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AbstractCARMENES (Calar Alto high-Resolution search for M dwarfs with Exo-earths with Near-infrared and optical Echelle Spectrographs) is a next-generation instrument under construction for the 3.5 m telescope at the Calar Alto Observatory by a consortium of eleven Spanish and German institutions. The scientific goal of the project is a five-year exoplanet survey targeting 300 M stars with the completed instrument. The CARMENES hardware consists of two separate échelle spectrographs covering the wavelength range from 0.55 to 1.7 μm at a spectral resolution of R = 82,000, fed by fibers from the

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Walker, R. L. "AY Vulpeculae." International Astronomical Union Colloquium 107 (1989): 374. http://dx.doi.org/10.1017/s0252921100088278.

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The star AY Vulpeculae was recognized as variable and labeled as an Algol-type system by Hoffmeister, (A.N. 242, 133, 1931). Koch et al. (I.B.V.S. 1709 1979), included it in their list of eclipsing binaries for which photoelectric work was needed. The system is faint, but because its primary minimum is very deep it is of astrophysical interest. The observations of the present investigation represent the first definitive photometric study made of AY VUL and is one of several systems with periods greater than two days being observed with the 1.0 meter Ritchey-Chretian reflector at the Flagstaff

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Whitney, Alan R. "Capabilities and performance of the upgraded Mark III correlator system." Symposium - International Astronomical Union 128 (1988): 429–37. http://dx.doi.org/10.1017/s0074180900119850.

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The Mark IIIA correlator system is currently operating at the U. S. Naval Observatory in Washington, D.C. in support of VLBI geodetic measurements being made by NASA, NGS, NRL, and USNO. This correlator system, developed at Haystack Observatory, is a second-generation version of the original Mark III correlator, and adds significant new capabilities such as double-speed operation, longer integration periods, and improved internal modelling.The Mark IIIA correlator can simultaneously process up to 10 baselines of data from 5 stations. Experiments including more than 5 stations may be processed

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Penhallow, W. S. "Astrometry with small telescopes." Symposium - International Astronomical Union 118 (1986): 315–16. http://dx.doi.org/10.1017/s0074180900151666.

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At the Quonochontaug Observatory of the University of Rhode Island, we specialize in the development of simple seeing limited optical telescopes. Our main instrument is a heavy Serrier trussed f/10.7, .4-m astrometric reflector which provided the last-minute astrometry in the successful prediction of the occultation of SAO 120774 by Herculina in 1978. It is similar in design to the U. S. Naval Observatory 1.5-m reflector. Its scale of 47.1“/mm makes it potentially more powerful than the Lick .5-m, f/7 astrograph. However, its field of view of 1.3° × 1.7° is insufficient to capture enough AGK3R

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Wiktorowicz, Sloane J., Agnieszka Słowikowska, Larissa A. Nofi, et al. "A Decade of Linear and Circular Polarimetry with the POLISH2 Polarimeter." Astrophysical Journal Supplement Series 264, no. 2 (2023): 42. http://dx.doi.org/10.3847/1538-4365/aca407.

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Abstract The POLISH2 optical polarimeter has been in operation at the Lick Observatory 3 m Shane telescope since 2011, and it was commissioned at the Gemini North 8 m in 2016. This instrument primarily targets exoplanets, asteroids, and the Crab Pulsar, but it has also been used for a wide variety of planetary, galactic, and supernova science. POLISH2's photoelastic modulators, employed instead of rotating wave plates or ferroelectric liquid crystal modulators, offer the unprecedented ability to achieve sensitivity and accuracy of order 1 ppm (0.0001%), which are difficult to obtain with conve

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Zhang, Zhida, Jiening Liang, Min Zhang, Qi Guo, and Lei Zhang. "Surface Layer Turbulent Characteristics over the Complex Terrain of the Loess Plateau Semiarid Region." Advances in Meteorology 2021 (June 11, 2021): 1–13. http://dx.doi.org/10.1155/2021/6618544.

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Surface layer turbulence has an important influence on land-air interactions and pollutant dispersion, and studying the characteristics of surface layer turbulence in complex terrain can contribute to understanding land-air interactions, improving model surface layer parameterization, and enhancing pollution prediction capabilities. The surface layer turbulence observations from the Semi-Arid Climate and Environment Observatory (SACOL) of Lanzhou University in 2008 were processed in this study. High-quality turbulence parameters were calculated, the statistical and transfer characteristics of

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Quirrenbach, A., P. J. Amado, J. A. Caballero, et al. "CARMENES: M dwarfs and their planets." Proceedings of the International Astronomical Union 11, S320 (2015): 388–90. http://dx.doi.org/10.1017/s1743921316000132.

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AbstractCARMENES (Calar Alto high-Resolution search for M dwarfs with Exo-earths with Near-infrared and optical Echelle Spectrographs) is a new instrument currently undergoing commissioning at the 3.5 m telescope of the Calar Alto Observatory. It has been constructed by a consortium of eleven Spanish and German institutions. The scientific goal of the project is a 600-night radial-velocity survey targeting 300 M dwarfs with sufficient precision to detect terrestrial planets in their habitable zones. The CARMENES instrument consists of two separate échelle spectrographs covering the wavelength

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Zavada, Petr, and Karel Píška. "Kinematics of the Milky Way from the Statistical Analysis of the Gaia Data Release 3." Galaxies 13, no. 1 (2025): 10. https://doi.org/10.3390/galaxies13010010.

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The aim of the analysis of data from the Gaia Space Observatory is to obtain kinematic parameters of the collective motion of stars in a part of our galaxy. This research is based on a statistical analysis of the motion of 55,038,539 stars selected in different directions from the Sun up to a distance of 3–6 kpc. We developed statistical methods for the analysis working with input data represented by the full astrometric solution (five parameters). Using the proposed statistical methods, we obtained the local velocity of the Sun U⊙,V⊙,W⊙=(9.58,16.25,7.33)±(0.05,0.04,0.02)stat±(0.7,0.9,0.1)syst

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Granovsky, Samuel, Alexander G. Kosovichev, Viacheslav M. Sadykov, Graham S. Kerr, and Joel C. Allred. "Strong Photospheric Heating Indicated by Fe i 6173 Å Line Emission during White-light Solar Flares." Astrophysical Journal 988, no. 1 (2025): 74. https://doi.org/10.3847/1538-4357/addd1e.

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Abstract Between 2017 and 2024, the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Observatory has observed numerous white-light solar flares (WLFs). HMI spectropolarimetric observations of certain WLFs, in particular the X9.3 flare of 2017 September 6, reveal one or more locations within the umbra or along the umbra/penumbra boundary of the flaring active region where the Fe I 6173 Å line briefly goes into full emission, indicating significant heating of the photosphere and lower chromosphere. For five flares featuring Fe I 6173 Å line-core emission, we perform spectropola

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Karapetyan, Emilia L. "New Spectral Observations of the Variable Galaxy Kaz 163." Proceedings of the International Astronomical Union 9, S304 (2013): 39–40. http://dx.doi.org/10.1017/s1743921314003251.

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AbstractKaz 163 is a close double galaxy. Its southern component S is compact, with a very blue nucleus, in which heated active processes take place. From time to time gas formations are ejected from it, which behave themselves like emission components around the main emission lines Hα and Hβ, around both from their long-wave and short-wave sides. This paper presents the spectral data of new observations, which were carried out with the 2.6m telescope at the Byurakan Astrophysical Observatory in September 2011. During the former observation in October 1981, lines [NII] λλ 6584,6548 were not vi

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Ball, Bill, and Gordon Bromage. "New EUV Selected Flare Stars." International Astronomical Union Colloquium 151 (1995): 67–68. http://dx.doi.org/10.1017/s0252921100034618.

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The ROSAT Wide Field Camera all-sky EUV survey of 1990-91 identified over 200 active late-type stars (Pounds et al. 1993). Most of these were not known to be active prior to the survey and follow-up optical spectroscopy has been successful in selecting the most active dMe stars. These stars are characterized by their Balmer line emission which is direct evidence for an active chromosphere. We present photometric monitoring data for 4 new dMe stars, including the discovery of flaring activity on all 4 stars.The observations were made at the South African Astronomical Observatory at Sutherland n

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Fu, Shenming, Ian Dell’Antonio, Ranga-Ram Chary, et al. "LoVoCCS. I. Survey Introduction, Data Processing Pipeline, and Early Science Results." Astrophysical Journal 933, no. 1 (2022): 84. http://dx.doi.org/10.3847/1538-4357/ac68e8.

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Abstract We present the Local Volume Complete Cluster Survey (LoVoCCS; we pronounce it as “low-vox” or “law-vox,” with stress on the second syllable), an NSF’s National Optical-Infrared Astronomy Research Laboratory survey program that uses the Dark Energy Camera to map the dark matter distribution and galaxy population in 107 nearby (0.03 < z < 0.12) X-ray luminous ([0.1–2.4 keV] L X500 > 1044 erg s−1) galaxy clusters that are not obscured by the Milky Way. The survey will reach Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) Year 1–2 depth (for galaxies r = 24.5, i

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Koelemay, L. A., та L. M. Ziurys. "Elusive Iron: Detection of the FeC Radical (X ³Δ_i) in the Envelope of IRC+10216". Astrophysical Journal Letters 958, № 1 (2023): L6. http://dx.doi.org/10.3847/2041-8213/ad0899.

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Abstract A new interstellar molecule, FeC (X 3Δ i ), has been identified in the circumstellar envelope of the carbon-rich asymptotic giant branch star IRC+10216. FeC is the second iron-bearing species conclusively observed in the interstellar medium, in addition to FeCN, also found in IRC+10216. The J = 4 → 3, 5 → 4, and 6 → 5 rotational transitions of this free radical near 160, 201, and 241 GHz, respectively, were detected in the lowest spin–orbit ladder, Ω = 3, using the Submillimeter Telescope of the Arizona Radio Observatory (ARO) for the 1 mm lines and the ARO 12 m at 2 mm. Because the g

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Leone, F., M. Gangi, M. Giarrusso, et al. "The solar-like ‘Second Spectrum’ and polarized metal lines in the emission of the post-AGB binary 89 Herculis." Monthly Notices of the Royal Astronomical Society 480, no. 2 (2018): 1656–65. http://dx.doi.org/10.1093/mnras/sty1882.

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ABSTRACT We studied the polarized spectrum of the post-AGB binary system 89 Herculis on the basis of data collected with the high-resolution Catania Astrophysical Observatory Spectropolarimeter, HArps-North POlarimeter and Echelle SpectroPolarimetric Device for the Observation of Stars. We find the existence of linear polarization in the strongest metal lines in absorption and with low excitation potentials. Signals are characterized by complex Q and U morphologies varying with the orbital period. We rule out magnetic fields, continuum depolarization due to pulsations and hot spots as the poss

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LOZITSKY, Vsevolod. "POSSIBILITIES OF ASTRONOMICAL AND ECOLOGICAL RESEARCH WITH HORIZONTAL SOLAR TELESCOPE OF AO KNU – AN OBJECT OF NATIONAL PROPERTY." Bulletin of Taras Shevchenko National University of Kyiv. Astronomy, no. 68 (2023): 63–70. http://dx.doi.org/10.17721/btsnua.2023.68.63-70.

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B a c k g r o u n d . The appearance in recent years of large solar telescopes, which achieve a spatial resolution of up to 50 km on the Sun, exacerbates the question of the feasibility of using much smaller solar telescopes. The presented work argues the thesis that even medium and relatively small solar telescopes can provide important information that corresponds to the current level of science in the fields of astronomy and environmental research. This is due to the fact that for spectral-polarization studies of active processes on the Sun, not only direct spatial resolution is critically

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Jacobson-Galán, W. V., L. Dessart, R. Margutti, et al. "SN 2023ixf in Messier 101: Photo-ionization of Dense, Close-in Circumstellar Material in a Nearby Type II Supernova." Astrophysical Journal Letters 954, no. 2 (2023): L42. http://dx.doi.org/10.3847/2041-8213/acf2ec.

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Abstract We present UV and/or optical observations and models of SN 2023ixf, a type II supernova (SN) located in Messier 101 at 6.9 Mpc. Early time (flash) spectroscopy of SN 2023ixf, obtained primarily at Lick Observatory, reveals emission lines of H i, He i/ii, C iv, and N iii/iv/v with a narrow core and broad, symmetric wings arising from the photoionization of dense, close-in circumstellar material (CSM) located around the progenitor star prior to shock breakout. These electron-scattering broadened line profiles persist for ∼8 days with respect to first light, at which time Doppler broaden

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Yao, Zhen-Guo, and Clayton Smith. "Equator and Equinox Solutions from Meridian Circle Observations of the Sun, Mercury and Venus at the Cape of Good Hope and the U. S. Naval Observatory from 1907 to 1971." Symposium - International Astronomical Union 156 (1993): 403. http://dx.doi.org/10.1017/s0074180900173589.

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A total of 53,259 observations(26,793 in declination and 26,466 in right ascension) of the Sun, Mercury and Venus made with the Washington, six-inch and nine-inch transit circles from 1911 to 1971 and the Cape of Good Hope reversible transit circle from 1907 to 1959 are used to obtain equator and equinox solutions.

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Siaude, Jiirgen. "B. R. DURNEY and S. %HA (Eds.): The Internal Solar Angular Velocity. Theory, Observations and Relationships to Solar Magnetic Fields. Proceedings of the 8th National Solar Observatory Summer Sympo-sium, held in Sunspot, New Mexico, August 11-14, 1986. Astro-physics and Space Science Library Vol. 137." Astronomische Nachrichten: A Journal on all Fields of Astronomy 310, no. 3 (1989): 251–52. http://dx.doi.org/10.1002/asna.2113100331.

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Černis, K., J. Zdanavičius, I. Wlodarczyk, and E. Stonkutė. "Discovery, Observational Data and the Orbit of the Amor Group Asteroid 2010 BT3." Open Astronomy 21, no. 3 (2012). http://dx.doi.org/10.1515/astro-2017-0385.

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AbstractA project devoted to astrometric and photometric observations of asteroids at the Molėtai Observatory is described. One of its most important results is the discovery of the asteroid 2010 BT3 belonging to the Amor group of the near-Earth objects. The results of astrometric and photometric observations of the asteroid are presented. The brightness variations of the asteroid are found to be about 0.2 mag in R. The orbit of the asteroid was computed from 96 observations. This orbit, combined with the apparent brightness, gives the absolute magnitude 21.34 mag and the diameter between 160

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Frisby, Edgar. "Observations of Barnard's Comet made at the U. S. Naval Observatory, Washington." April 2, 2006. https://doi.org/10.1002/asna.18821040407.

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Cotrim, Teresa, Anabela Pereira, Cláudia Fernandes, et al. "Observatório Português de Fatores Psicossociais Ocupacionais: do desenvolvimento ao contributo para o futuro." May 6, 2024. https://doi.org/10.25762/xnjg-7j70.

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<u>Resumo</u>: O impacto dos fatores psicossociais nas organizações tem sido identificado nacional e internacionalmente, com um alerta sobre os riscos para a saúde dos trabalhadores (stress, <em>burnout</em>, depressão, ansiedade, sintomatologia músculo-esquelética, ...) e as consequências para as organizações (perdas de produtividade, de qualidade, absentismo, presentismo, ...). Numa perspetiva de gestão dos riscos psicossociais, a primeira etapa refere-se à identificação e caracterização d

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Molina-Jorquera, F., D. Fernández-Olivares, M. Jaque Arancibia, et al. "Determination of metallicities of red giant stars using machine learning techniques applied to the narrow and broadband photometry of the S-PLUS survey The catalogue is available at the CDS." Astronomy & Astrophysics, September 12, 2024. http://dx.doi.org/10.1051/0004-6361/202451059.

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The aim of this study is to obtain metallicities of red giant stars from the Southern Photometric Local Universe Survey (S-PLUS) and to classify giant and dwarf stars using artificial neural networks applied to the S-PLUS photometry. We combined the five broadband and seven narrow-band filters of S-PLUS —especially centred on prominent stellar spectral features— to train machine learning algorithms. The training catalogue was made by cross-matching the S-PLUS and Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) survey catalogues. The classification neural network uses the co

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Movsessian, T., S. Dodonov, V. Gabrielyan, S. Kotov, and M. Gevorgyan. "New Capabilities of One-Meter Schmidt Telescope of the Byurakan Astrophysical Observatory after Modernization." Communications of the Byurakan Astrophysical Observatory, 2017, 92–101. http://dx.doi.org/10.52526/25792776-2017.1-92.

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Within the framework of cooperation between Byurakan Astrophysical Observatory and Special Astrophysical Observatory during 2013–2015 y the 1-m Schmidt telescope of the Byurakan Astrophysical was upgraded. We completely redesigned the control system of the telescope: we replaced the actuating mechanisms, developed telescope control software, and made the guiding system. In the Special Astrophysical Observatory the 4k×4k Apogee (USA) liquid-cooled CCD was reworked and prepared. Detector was mounted in the focus of the telescope and provides 1 degree field of view with pixel-size of 0.868, and R

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CESAER. "Design Principles for European Higher Education Sector Observatory." June 27, 2022. https://doi.org/10.5281/zenodo.6759950.

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The leading universities of science & technology united in CESAER welcome the initiative for a European Higher Education Sector Observatory as proposed by the European Commission in its communication on a European strategy for universities and solidified with the Council conclusions from 5 April 2022. Our association and our Members continue to engage to better understand and advocate the approaches and metrics used for ranking, benchmarking and assessing higher education institutions to enable fair and reasonable performance analysis reflecting the strengths and challenges of our Members.

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Sun, Xiaohui, Marijke Haverkorn, Ettore Carretti, et al. "The Southern Twenty-centimetre All-sky Polarization Survey (STAPS): Survey description and maps." Astronomy & Astrophysics, January 28, 2025. https://doi.org/10.1051/0004-6361/202453326.

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We present data processing and verification of the Southern Twenty-centimetre All-sky Polarization Survey (STAPS) conducted with Murriyang, the Parkes 64-m telescope. The survey covers the sky area of -89 Dec and the frequency range of 1.3-1.8 GHz split into 1-MHz channels. STAPS was observed commensally with the S-band Polarization All-Sky Survey (S-PASS). The survey is composed of long azimuth scans, which allows us to absolutely calibrate Stokes Q and U with the data processing procedure developed for S-PASS. We obtained I, Q, and U maps on both the flux density scale (Jy beam^-1) and the m

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Eyles-Ferris, R. A. J., P. A. Evans, A. A. Breeveld, et al. "Panning for gold with the Neil Gehrels Swift Observatory: An optimal strategy for finding the counterparts to gravitational wave events." Monthly Notices of the Royal Astronomical Society, December 19, 2024. https://doi.org/10.1093/mnras/stae2785.

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Abstract The LIGO, Virgo and KAGRA (LVK) gravitational wave observatories are currently undertaking their O4 observing run offering the opportunity to discover new electromagnetic counterparts to gravitational wave events. We examine the capability of the Neil Gehrels Swift Observatory (Swift) to respond to these triggers, primarily binary neutron star mergers, with both the UV/Optical Telescope (UVOT) and the X-ray Telescope (XRT). We simulate Swift’s response to a trigger under different strategies using model skymaps, convolving these with the 2MPZ catalogue to produce an ordered list of ob

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Mo, Fu, Junzhi Wang, Shu Liu, et al. "DCO^+ and DCN 1-0 survey toward a sample of Planck cold clumps." Astronomy & Astrophysics, March 24, 2025. https://doi.org/10.1051/0004-6361/202452072.

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Deuterated molecules can be used to study the physical conditions and astro-chemical evolution of molecular clouds. Large-sample surveys for deuterated molecules are needed to understand the enhancement of deuterated molecules from diffuse molecular gas to cold cores. A single-pointing survey toward the 559 Planck cold clumps of the Early Cold Core Catalogue (ECC) was conducted using the Arizona Radio Observatory 12-meter telescope, focusing on the J=1-0 transitions of DCO^+ and DCN. The survey included observations of 309 cores for DCO^+ and DCN 1-0 simultaneously, followed by 71 of these cor

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Herpich, F. R., F. Almeida-Fernandes, L. Nakazono, et al. "The Fourth S-PLUS Data Release: 12-filter photometry covering ~3000 square degrees in the southern hemisphere." Astronomy & Astrophysics, August 1, 2024. http://dx.doi.org/10.1051/0004-6361/202449725.

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The Southern Photometric Local Universe Survey (S-PLUS) is a project to map $ sq deg of the sky using twelve bands (seven narrow and five broadbands). Observations are performed with the T80-South telescope, a robotic telescope located at the Cerro Tololo Observatory in Chile. The survey footprint consists of several large contiguous areas, including fields at high and low galactic latitudes, and towards the Magellanic Clouds. S-PLUS uses fixed exposure times to reach point source depths of about $21$ mag in the $griz$ and $20$ mag in the $u$ and the narrow filters. This paper describes the S-

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Chakraborty, Abhijit, Kapil Kumar Bharadwaj, Jajaendra Siva Sehu Vara Prasad Neelam, et al. "The PRL 2.5m Telescope and its First Light Instruments: FOC and PARAS-2." Bulletin de la Société Royale des Sciences de Liège, 2024, 68–88. http://dx.doi.org/10.25518/0037-9565.11602.

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We present here the information on the design and performance of the recently commissioned 2.5-meter telescope at the PRL Mount Abu Observatory, located at Gurushikhar, Mount Abu, India. The telescope has been successfully installed at the site, and the Site Acceptance Test (SAT) was completed in October 2022. It is a highly advanced telescope in India, featuring the Ritchey-Chrétien optical configuration with primary mirror active optics, tip-tilt on sideport, and wave front correction sensors. Along with the telescope, its two first light instruments namely Faint Object Camera (FOC) and PARA

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Madarász, M., G. Marton, I. Gezer, et al. "A deep neural network approach to compact source removal." Astronomy & Astrophysics, March 7, 2025. https://doi.org/10.1051/0004-6361/202453262.

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Analyzing extended emission in photometric observations of star-forming regions requires maps free from compact foreground, embedded, and background sources, which can interfere with various techniques used to characterize the interstellar medium. Within the framework of the NEMESIS project, we applied machine-learning techniques to improve our understanding of the star formation timescales, which involves the unbiased analysis of the extended emission in these regions. We present a deep learning-based method for separating the signals of compact sources and extended emission in photometric ob

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Rose, Megan Catherine, and Patrick W. Galbraith. "Mutating Hyperfemininity in <em>Bishōjo</em>-Inspired Art." M/C Journal 28, no. 2 (2025). https://doi.org/10.5204/mcj.3168.

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Introduction “With most people, you cannot tell just from looking at them that they are fighting a silent, unseen battle”, says Sugary Symbiote, a Black, disabled, and sapphic artist in the United States. “That is what a lot of my illustrations represent. The girl is surrounded by cute things that make her happy, but she still feels alone and sad” (Sugary Symbiote). Central to her work is the bishōjo, or “cute girl”, drawn from manga, anime, and related media. While scholarship has largely treated bishōjo as objects produced for and by men (Galbraith; Galbraith and Rose), artists such as Sugar

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Heckman, Davin. "Being in the Shadow of Hollywood." M/C Journal 7, no. 5 (2004). http://dx.doi.org/10.5204/mcj.2436.

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Landing in the Midwest after a lifetime in Los Angeles, I was shocked to learn how “famous” that great city really is. It used to seem perfectly reasonable that the freeways on CHiPs looked just like the ones I rode to school. When I was five, I remember being secretly bummed that my mom never took us to the disco-classical mural from Xanadu, which I was convinced had to be hidden somewhere in Venice Beach. In high school, it never seemed strange that the Peach Pit on Beverly Hills 90210 was the same as the Rose City Diner. From the L.A. River to the Griffith Park Observatory, from the Hollywo

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