منابع مشابه
Open clusters with Hipparcos ?
New memberships, mean parallaxes and proper motions of all 9 open clusters closer than 300 pc (except the Hyades) and 9 rich clusters between 300 and 500 pc have been computed using Hipparcos data. Precisions, ranging from 0.2 to 0.5 mas for parallaxes and 0.1 to 0.5 mas/yr for proper motions, are of great interest for calibrating photometric parallaxes as well as for kinematical studies. Caref...
متن کاملHipparcos Luminosities and Asteroseismology
Asteroseismology involves using the resonant frequencies of a star to infer details about its internal structure and evolutionary state. Large efforts have been made and continue to be made to measure oscillation frequencies with both groundand space-based telescopes, with typical precisions of one part in 10–10. However, oscillation frequencies are most useful when accompanied by accurate meas...
متن کاملSupernovae with “ Super - Hipparcos ”
GAIA is the " super-Hipparcos " satellite scheduled for launch in 2010 by the European Space Agency. It is a scanning satellite that carries out multi-colour, multi-epoch pho-tometry on all objects brighter than 20th magnitude. We conduct detailed simulations of supernovae (SNe) detection by GAIA. Supernovae of each type are chosen according to the observed distributions of absolute magnitudes,...
متن کاملThe Hipparcos mission: photometric data
An overview of the Hipparcos and Tycho photometric data is presented, with reference to the main aspects of the data reductions and the overall quality and quantity of the results. The data have been presented in three forms: as mean values in the astrometric catalogues, as epoch photometry, and as interpreted results of the variability analysis, which is also briefly described.
متن کاملA successful launch.
One year ago, the American Society for Clinical Investigation (ASCI) launched JCI Insight. I am pleased to report that the last year has been a resounding success for the Society’s newest journal. Let me begin with some background. In my inaugural editorial, I laid out the rationale for JCI Insight (1). In brief, its mission is two-fold: to provide an additional forum for ASCI members and other...
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ژورنال
عنوان ژورنال: Nature
سال: 1989
ISSN: 0028-0836,1476-4687
DOI: 10.1038/340252b0