Results 91 to 100 of about 3,440 (204)
Symposium - International Astronomical Union, 1994 VLBI is at present the most accurate technique for measuring radiosource positions and the only method capable of high precision for a reasonable number of sources. The applications of VLBI astrometry in stellar, Galactic and extra-Galactic regimes are reviewed.
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Gaia23ckh: Symbiotic outburst of the assumed Mira variable V390 Sco
Astronomische Nachrichten, Volume 345, Issue 5, June 2024.Abstract The poorly studied variable star V390 Sco, previously classified as a Mira pulsator, was detected in a brightening event by the ESA Gaia satellite in September 2023. This work presents an analysis of available archival multifrequency photometric data of this target, along with our spectroscopic observations. Our findings lead to the conclusion
Jaroslav Merc +7 more
wiley +1 more source
The value of astrometry for exoplanet science [PDF]
arXiv, 2018 Exoplanets mass measurements will be a critical next step to assess the habitability of Earth-like planets: a key aspect of the 2020 vision in the previous decadal survey and also central to NASA's strategic priorities. Precision astrometry delivers measurement of exoplanet masses, allowing discrimination of rocky planets from water worlds and enabling
arxiv
Exoplanet search with astrometry [PDF]
New Astronomy Reviews, 2009 20 pages, 7 figures, contribution to the summerschool "Astrometry and Imaging with the Very Large Telescope Interferometer", 2 - 13 June, 2008, Keszthely ...
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Orbits of the Asteroids Discovered at the Molėtai Observatory in 2000–2004
Open Astronomy, 2014 The paper presents statistics of the asteroids observed and discovered at the Molėtai Observatory, Lithuania in 2000–2004 within the project for astrometric observations of the near-Earth objects (NEOs), the main belt asteroids and comets.
Černis K. +2 more
doaj +1 more source
The principle of measuring unusual change of underground mass by optical astrometric instrument
Geodesy and Geodynamics, 2012 Optical observations from a ground-based astrometric instrument provide a unique set of data sensitive to variations of local plumb line, which represent the change of local gravitational field on the ground.
Wang Jiancheng +7 more
doaj +1 more source
The potentially hazardous NEA 2001 BB16
Open Astronomy, 2019 We computed the impact solutions of the potentially dangerous Near Earth Asteroid (NEA) 2001 BB16 based on 47 optical observations from January 20.08316 UTC, 2001, through February 09.15740 UTC, 2016, and one radar observation from January 19.90347 UTC ...
Wlodarczyk Ireneusz
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Astrometry during the past 2000 years [PDF]
arXiv, 2011 The satellite missions Hipparcos and Gaia by the European Space Agency will together bring a decrease of astrometric errors by a factor 10000, four orders of magnitude, more than was achieved during the preceding 500 years. This modern development of astrometry was at first obtained by photoelectric astrometry. An experiment with this technique in 1925
arxiv
Astrometry with Small Telescopes [PDF]
Symposium - International Astronomical Union, 1986 At the Quonochontaug Observatory of the University of Rhode Island, we specialize in the development of simple seeing limited optical telescopes. Our main instrument is a heavy Serrier trussed f/10.7, .4-m astrometric reflector which provided the last-minute astrometry in the successful prediction of the occultation of SAO 120774 by Herculina in 1978 ...
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Astrometry with Schmidt Telescopes [PDF]
International Astronomical Union Colloquium, 1984 Photographic astrometry, including work with Schmidt telescopes, can be divided into two main fields, (i) the measurement of positions of objects relative to a reference frame of stars with known celestial coordinates, and (ii) the measurement of relative proper motions and trigonometric parallaxes from a series of plates taken on the same field.
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