Results 1 to 10 of about 34,682 (203)
Proper motions of the satellites of M31 [PDF]
Monthly Notices of the Royal Astronomical Society, 2019 Abstract We predict the range of proper motions of 19 satellite galaxies of M31 that would rotationally stabilize the M31 plane of satellites consisting of 15–20 members as identified by Ibata et al. Our prediction is based purely on the current positions and line-of-sight velocities of these satellites and the assumption that the plane ...
Jakub Scholtz
exaly +6 more sources
Improvement of Hipparcos proper motions in declination [PDF]
Serbian Astronomical Journal, 2006 More than a decade elapsed after the HIPPARCOS ESA mission (ESA 1997) observations have been collected. This first astronomical satellite mission was less than 4 years long so that 1991.25 is the epoch of the HIPPARCOS Catalogue. Many other projects have
Damljanović Goran M. +2 more
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Absolute proper motions for the calibration of the Hipparcos proper motion system [PDF]
Astronomy and Astrophysics Supplement Series, 1997 Absolute proper motions of 48 Hipparcos stars in nine elds distributed over the northern hemisphere are presented. The proper motions have been recently used as part of the Bonn program for the extragalactic link of the Hipparcos proper motion system. We describe methods which have led to the absolute proper motions of the major part of the Bonn elds ...
M. Geffert +3 more
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Corrections of proper motions in declination by using ILS data [PDF]
Serbian Astronomical Journal, 2006 There are nowadays numerous astrometric ground{based observations of some stars referred to Hipparcos Catalogue, made at many observatories during the last century.
Damljanović G., Pejović N.
doaj +2 more sources
Detection of proper motion in OQ 208?
New Astronomy Reviews, 2000 Abstract We report on an ongoing project aimed to detect the separation speed of the two hot-spots of the Compact Symmetric Object OQ208. Comparing images at 8.4 GHz taken in 6 epochs between 1994 and 1997 we obtain an estimate of 0.061±0.024 mas/year for the relative motion between the two outer and compact components of the radio source, and a ...
Liu Xiang +3 more
openaire +2 more sources
The PMA Catalogue: 420 million positions and absolute proper motions
Monthly Notices of the Royal Astronomical Society, 2017 We present a catalogue that contains about 420 million absolute proper motions of stars. It was derived from the combination of positions from Gaia DR1 and 2MASS, with a mean difference of epochs of about 15 yr.
V S Akhmetov, V M Shulga
exaly +2 more sources
Proper Motions of Jets on the Kiloparsec Scale: New Results with HST
Galaxies, 2017 The Hubble Space Telescope recently celebrated 25 years of operation. Some of the first images of extragalactic optical jets were taken by HST in the mid-1990s; with time baselines on the order of 20 years and state-of-the-art astrometry techniques, we ...
Eileen T. Meyer +9 more
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Orbits of LMC/SMC with recent ground-based proper motions
EPJ Web of Conferences, 2012 In recent years, with new ground-based and HST measurements of proper motions of the Magellanic Clouds being published, a need of a reanalysis of possible orbital history has arisen.
Růžička A. +3 more
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Proper motions in cepheus a [PDF]
, 2005 "We present an analysis of radio continuum observations made with the VeryLarge Array toward the region of massive star formation Cepheus A. The mainpurpose of this analysis is to search and study proper motions in the radio sourcesover the two decades of time covered by the observations.
Rodríguez, L. F. +5 more
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Independent analysis of μδ data of ILS and INDLS catalogs to obtain the spin of the bright Gaia DR2 reference frame [PDF]
Serbian Astronomical Journal, 2021 The Gaia DR2 reference frame should be without relative rotation to the quasars (QSOs) and consistent with the International Celestial Reference System (ICRS).
Damljanović G. +2 more
doaj +1 more source