Results 21 to 30 of about 31,207 (206)
Commission 8: Astrometry [PDF]
Proceedings of the International Astronomical Union, 2005 AbstractThis triennial report from Commission 8 covers astrometry-related matters for objects ranging from Solar system bodies out to Milky Way stars and QSOs at cosmological distances. This enormous range of distances is needed to establish, maintain, and improve the metric of the visible Universe--a very challenging effort since everything is moving.
Platais, Imants +9 more
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The Astrometric Foundation of Astrophysics [PDF]
, 2014 Astrophysical studies require a knowledge of very accurate positions, motions and distances of stars. A brief overview is given of the significance and development of astrometry by ESA's two astrometric satellites, Hipparcos and Gaia, launched in ...
Høg, Erik
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Orbital Parameter Determination for Wide Stellar Binary Systems in the Age of Gaia
, 2020 The orbits of binary stars and planets, particularly eccentricities and inclinations, encode the angular momentum within these systems. Within stellar multiple systems, the magnitude and (mis)alignment of angular momentum vectors among stars, disks, and ...
Dupuy, Trent J. +6 more
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Commission 24: Photographic Astrometry: (Astrometrie Photographique) [PDF]
Transactions of the International Astronomical Union, 2000 The scope of scientific interests of about 130 Commission members is much more complex than one may expect from the title of the commission. Besides traditional topics like the compilation of astrometric catalogues and the construction of an inertial reference system, more and more investigations performed by our members have been dedicated to the ...
E. Schilbach +8 more
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Improved astrometry for the Bohannan & Epps catalogue
, 2012 Aims: Accurate astrometry is required to reliably cross-match 20th-century catalogues against 21st-century surveys. The present work aims to provide such astrometry for the 625 entries of the Bohannan & Epps (BE74) catalogue of H$\alpha$ emission-line ...
Howarth, Ian D.
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Combining astrometry with the light-time effect: The case of VW Cep, zeta Phe and HT Vir [PDF]
, 2007 Three eclipsing binary systems with astrometric orbit have been studied. For a detailed analysis two circular-orbit binaries (VW Cep and HT Vir) and one binary with an eccentric orbit (zeta Phe) have been chosen.
Albayrak +62 more
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Halometry from astrometry [PDF]
Journal of Cosmology and Astroparticle Physics, 2018 Halometry---mapping out the spectrum, location, and kinematics of nonluminous structures inside the Galactic halo---can be realized via variable weak gravitational lensing of the apparent motions of stars and other luminous background sources. Modern astrometric surveys provide unprecedented positional precision along with a leap in the number of ...
Van Tilburg, Ken +2 more
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GIER: A Danish computer from 1961 with a role in the modern revolution of astronomy
, 2017 A Danish computer, GIER, from 1961 played a vital role in the development of a new method for astrometric measurement. This method, photon counting astrometry, ultimately led to two satellites with a significant role in the modern revolution of astronomy.
Høg, Erik
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The History of Astrometry [PDF]
, 2012 The history of astrometry, the branch of astronomy dealing with the positions of celestial objects, is a lengthy and complex chronicle, having its origins in the earliest records of astronomical observations more than two thousand years ago, and ...
Perryman, Michael
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Geochemistry, Geophysics, Geosystems, 2023 On 20 December 2020, after more than 2 years of quiescence at Kīlauea Volcano, Hawaiʻi, renewed volcanic activity in the summit crater caused boiling of the water lake over a period of ∼90 min. The resulting water‐rich, electrified plume rose to 11–13 km
Ryan C. Cahalan +11 more
doaj +1 more source