Star catalog position and proper motion corrections in asteroid astrometry II: The Gaia era
Sign Up to like & getrecommendations! Published in 2020 at "Icarus"
DOI: 10.1016/j.icarus.2014.07.033
Abstract: Abstract We provide a scheme to correct asteroid astrometric observations for star catalog systematic errors due to inaccurate star positions and proper motions. As reference we select the most accurate stars in the PPMXL catalog,… read more here.
Keywords: catalog; star catalog; astrometry; star ... See more keywords
Fast jet proper motion discovered in a blazar at z=4.72
Sign Up to like & getrecommendations! Published in 2020 at "Science Bulletin"
DOI: 10.1016/j.scib.2020.01.008
Abstract: High-resolution observations of high-redshift ($z>4$) radio quasars offer a unique insight into jet kinematics at early cosmological epochs, as well as constraints on cosmological model parameters. Due to the general weakness of extremely distant objects… read more here.
Keywords: kinematics; jet proper; jet; high redshift ... See more keywords
A survey for low-mass stellar and substellar members of the Hyades open cluster
Sign Up to like & getrecommendations! Published in 2018 at "Astronomy and Astrophysics"
DOI: 10.1051/0004-6361/201630134
Abstract: Unlike young open clusters (with ages read more here.
Keywords: mass; survey; low mass; cluster ... See more keywords
New members of Cygnus OB2 from Gaia DR2
Sign Up to like & getrecommendations! Published in 2021 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stab457
Abstract: Due to the high quality of Gaia DR2 stellar parallaxes and proper motions, we can study the Cygnus OB2 region up to G = 17.5 mag in circular region centred at (l, b) = (79.8°,… read more here.
Keywords: gaia dr2; new members; region; proper motion ... See more keywords
Proper motion separation of Be star candidates in the Magellanic Clouds and the Milky Way
Sign Up to like & getrecommendations! Published in 2017 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stx1047
Abstract: We present a proper motion investigation of a sample of Be star candidates towards the Magellanic Clouds, which has resulted in the identification of separate populations, in the Galactic foreground and in the Magellanic background.… read more here.
Keywords: star candidates; milky way; magellanic clouds; star ... See more keywords
A ground-based proper motion study of 12 nearby globular clusters
Sign Up to like & getrecommendations! Published in 2017 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stx1637
Abstract: We derive relative proper motions of stars in the fields of the globular clusters M12, NGC 6362, M4, M55, M22, NGC 6752, NGC 3201, M30, M10, NGC 362, M5, and 47 Tucanae based on data… read more here.
Keywords: ground based; motion study; based proper; proper motions ... See more keywords
Mildly relativistic motion in the radio quiet quasar PG 1351+640
Sign Up to like & getrecommendations! Published in 2023 at "Monthly Notices of the Royal Astronomical Society: Letters"
DOI: 10.1093/mnrasl/slad051
Abstract: Measuring the proper motion of the emission component in radio-quiet quasars (RQQs) could help to distinguish between the origins of the radio emission and to understand whether the jet production mechanism is the same in… read more here.
Keywords: radio quiet; 1351 640; motion; jet ... See more keywords
Why Halley Did Not Discover Proper Motion and Why Cassini Did
Sign Up to like & getrecommendations! Published in 2019 at "Journal for the History of Astronomy"
DOI: 10.1177/0021828619877967
Abstract: In 1717, Halley compared contemporaneous measurements of the latitudes of four stars with earlier measurements by ancient Greek astronomers and by Brahe, and from the differences concluded that these four stars showed proper motion. An… read more here.
Keywords: halley discover; halley; discover proper; motion cassini ... See more keywords