Results 11 to 20 of about 7,595 (254)

Masses, bulk densities, and macroporosities of asteroids (15) Eunomia, (29) Amphitrite, (52) Europa, and (445) Edna based on Gaia astrometry [PDF]

A&A 658, A65 (2022), 2021
Gaia Data Release 2 (DR2) includes milliarcsecond-accuracy astrometry for 14,099 asteroids. We explore the practical impact of this data for the purpose of asteroid mass and orbit estimation by estimating the masses individually for four large asteroids. We use various combinations of Gaia astrometry and/or Earth-based astrometry so as to determine the
arxiv   +1 more source

Applications of the Source-Frequency Phase-Referencing Technique for ngEHT Observations

Galaxies, 2022
The source-frequency phase-referencing (SFPR) technique has been demonstrated to have great advantages for mm-VLBI observations. By implementing simultaneous multi-frequency receiving systems on the next-generation Event Horizon Telescope (ngEHT ...
Wu Jiang, Guang-Yao Zhao, Zhi-Qiang Shen, María J. Rioja, Richard Dodson, Ilje Cho, Shan-Shan Zhao, Marshall Eubanks, Ru-Sen Lu   +8 more
doaj   +1 more source

Astrometry test of MSCRED IRAF software package [PDF]

Serbian Astronomical Journal, 2005
Astrometric properties of images obtained using MSCRED IRAF software package are investigated. CCD observations of M35 open cluster were taken in an observation run between October 10 and 17, 2004 at Belogradchick Observatory (Bulgaria) using the 60cm ...
Popescu R., Popescu P., Paraschiv P., Nedelcu A.   +3 more
doaj   +1 more source

Orientations of orbital planes of binaries [PDF]

Serbian Astronomical Journal, 2004
Orientations of orbital planes of binaries are analyzed by using a complete sample of known orbital systems. The use of a so large sample is possible due to the application of a new procedure enabling to include the binaries for which the ascending nodes
Popović Georgije M., Pavlović Rade M., Ninković Slobodan D.   +2 more
doaj   +1 more source

Microarcsecond Astrometry: Science Highlights from Gaia [PDF]

Annual Review of Astronomy and Astrophysics, Vol. 59, 2021, pp:59-115, 2021
Access to microarcsecond astrometry is now routine in the radio, infrared, and optical domains. In particular the publication of the second data release from the Gaia mission made it possible for every astronomer to work with easily accessible, high-precision astrometry for 1.7 billion sources to 21st magnitude over the full sky.
arxiv   +1 more source

The Golden meteorite fall: Fireball trajectory, orbit, and meteorite characterization

Meteoritics &Planetary Science, Volume 58, Issue 12, Page 1773-1807, December 2023., 2023
Abstract The Golden (British Columbia, Canada) meteorite fall occurred on October 4, 2021 at 0534 UT with the first recovered fragment (1.3 kg) landing on an occupied bed. The associated fireball was recorded by numerous cameras permitting reconstruction of its trajectory and orbit. The fireball entered the atmosphere at a 54° angle from the horizontal
P. G. Brown, P. J. A. McCausland, A. R. Hildebrand, L. T. J. Hanton, L. M. Eckart, H. Busemann, D. Krietsch, C. Maden, K. Welten, M. W. Caffee, M. Laubenstein, D. Vida, F. Ciceri, E. Silber, C. D. K. Herd, P. Hill, H. Devillepoix, Eleanor K. Sansom, Martin Cupák, Seamus Anderson, R. L. Flemming, A. J. Nelson, M. Mazur, D. E. Moser, W. J. Cooke, D. Hladiuk, Barbara Malečić, Maja Telišman Prtenjak, R. Nowell, The Golden Meteorite Consortium   +29 more
wiley   +1 more source

Observational data and orbits of the comets discovered at the Vilnius Observatory in 1980–2006 and the case of the comet 322P

Open Astronomy, 2022
This article is devoted to the discovery of comets at the Vilnius Observatory together with the orbital analysis of dynamically interesting comets, namely 322P. We studied the orbital evolution of comet 322P with and without non-gravitational effects. It
Włodarczyk Ireneusz, Černis Kazimieras
doaj   +1 more source

SST Anywhere—A Portable Solution for Wide Field Low Earth Orbit Surveillance

Remote Sensing, 2022
The low-Earth orbit (LEO) is filled with active satellites, but also with space debris, which need constant observation. The orbiting objects may be affected by collisions or by atmospheric drag, and therefore they can change their orbit or even fall to ...
Radu Gabriel Danescu, Razvan Itu, Mircea Paul Muresan, Ana Rednic, Vlad Turcu   +4 more
doaj   +1 more source

Observational data and orbits of the asteroids discovered at the Baldone Observatory in 2015–2018

Open Astronomy, 2020
This paper is devoted to the discovery of 37 asteroids at the Baldone Astrophysical Observatory (MPC 069) from 2015 to 2018, and one of dynamically interesting Mars-crosser (MC) observed at the Baldone Astrophysical Observatory, namely 2008 LX16.
Wlodarczyk Ireneusz, Černis Kazimieras, Eglitis Ilgmars   +2 more
doaj   +1 more source

Photographic zenith tubes observations to improve HIPPARCOS proper motion in declination of some stars [PDF]

Serbian Astronomical Journal, 2005
A procedure of calculation and results of an attempt to improve proper motions in declination for some HIPPARCOS stars are presented. A long series of optical observations of these stars observed with Photographic Zenith Tubes (PZT) are used.
Damljanović Goran M.
doaj   +1 more source