Results 31 to 40 of about 41,651 (296)

Precise Distance Measurement for a Near-Earth Asteroid by the Refined Rotational Reflex Velocity Method

open access: yesThe Astronomical Journal, 2023
The rotational reflex velocity (RRV) method was proposed by Heinze and Metchev in 2015 and was used to measure the distances of main-belt asteroids (MBAs). Later, Lin et al. generalized this method using spherical astronomy in 2016.
B. F. Guo   +3 more
doaj   +1 more source

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

open access: yesGalaxies, 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   +8 more
doaj   +1 more source

Orientations of orbital planes of binaries [PDF]

open access: yesSerbian 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.   +2 more
doaj   +1 more source

Astrometry test of MSCRED IRAF software package [PDF]

open access: yesSerbian 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.   +3 more
doaj   +1 more source

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

open access: yesAstronomy & Astrophysics, 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.
L. Siltala, M. Granvik
semanticscholar   +1 more source

Gaia Data Release 1: Astrometry - one billion positions, two million proper motions and parallaxes [PDF]

open access: yes, 2016
Gaia Data Release 1 (Gaia DR1) contains astrometric results for more than 1 billion stars brighter than magnitude 20.7 based on observations collected by the Gaia satellite during the first 14 months of its operational phase.
L. Lindegren   +83 more
semanticscholar   +1 more source

Discovery of a dormant 33 solar-mass black hole in pre-release Gaia astrometry [PDF]

open access: yesAstronomy & Astrophysics
Gravitational waves from black-hole (BH) merging events have revealed a population of extra-galactic BHs residing in short-period binaries with masses that are higher than expected based on most stellar evolution models -- and also higher than known ...
Gaia Collaboration P. Panuzzo   +413 more
semanticscholar   +1 more source

Emission-line stars in the LMC: the Armagh survey, and a metacatalogue [PDF]

open access: yes, 2013
[Aims] Accurate astrometry is required to reliably cross-match 20th-century photographic catalogues against 21st-century digital surveys. The present work provides modern-era identifications and astrometry for the 801 emission-line objects "of stellar ...
Howarth, Ian D.
core   +2 more sources

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

open access: yesOpen 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

open access: yesRemote 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   +4 more
doaj   +1 more source

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