منابع مشابه
Preliminary reduction and analysis of the Bucarest Observatory photographic plates: Astrometry of asteroids (1931-1933)
The Romanian Astronomical Plate Archive consists of 10550 plates of which 8169 are of ast roids observations. A total of 850 asteroids and 78 comets were observed in the 1930-2005 period. After a careful investigation of the whole plate archive we discovered that a series of observations were not capitalized, such as a set of minor planets which were observed during 1930-1955. The lack of accur...
متن کاملCombining Astrometry and Spectroscopy
Orbital solutions for binary or multiple stellar systems that combine astrometry (e.g., position angles and angular separations) with spectroscopy (radial velocities) have important advantages over astrometric-only or spectroscopic-only solutions. In many cases they allow the determination of the absolute masses of the components, as well as the distance. Yet, these kinds of combined solutions ...
متن کاملExoplanet search with astrometry
Searching for extrasolar planets by direct detection is extremely challenging for current instrumentation. Indirect methods, that measure the effect of a planet on its host star, are much more promising and have indeed led to the discovery of nearly all extrasolar systems known today. While the most successful method thus far is the radial velocity technique, new interferometric instruments lik...
متن کاملPrinciples of statistical astrometry
We present a coherent scheme of ‘statistical astrometry’ for high-precision measurements. Statistical astrometry provides methods and tools for treating quantitatively the overall statistical effect of the presence of many individually unresolved or unmodelled astrometric binaries in a stellar ensemble. The non-linear motions of the photo-centers of these binaries give rise to deviations from l...
متن کاملAstrometry of Circumstellar Masers
The circumstellar masers around evolved stars offer an interesting possibility to measure stellar parameters through VLBI astrometry. In this paper the application of this technique is discussed, including the accuracy and the uncertainties of the method. The different maser species (OH, H2O, SiO) have slightly different characteristics and applications. This paper does not concern astrometry o...
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ژورنال
عنوان ژورنال: Transactions of the International Astronomical Union
سال: 1985
ISSN: 0251-107X
DOI: 10.1017/s0251107x00006350