Forbidding
发表于 2025-3-21 19:24:05
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羊栏
发表于 2025-3-21 20:55:01
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Boycott
发表于 2025-3-22 02:26:44
Thomas Hoffmeister,Henning Koch,Peter Trempthe solar neighborhood. Major obstacles to the full use of proper motions have long been posed by: (1) incompleteness of proper motion surveys, (2) proper motion bias in kinematic studies, and (3) the indirect approaches and kinematical assumptions needed in traditional luminosity studies.
Arctic
发表于 2025-3-22 05:49:30
Thomas Hoffmeister,Henning Koch,Peter Trempome consequences are indicated for the determination of cluster parallaxes, of secular parallaxes and of the galactic rotation. In general, we stress the necessity of always searching for . signal in the data — including those ones which are not understood and hence not ‘wanted’.
才能
发表于 2025-3-22 10:32:46
Margrit E. Kaufmann,Henning Kochof the FK5 system which will be performed with the aid of new analytical methods developed at Heidelberg. The basic characteristics of these methods are described, and information on the most significant errors in the FK4 system is given.
不规则的跳动
发表于 2025-3-22 13:34:18
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sleep-spindles
发表于 2025-3-22 21:06:06
https://doi.org/10.1007/978-3-662-53308-6o on, relies upon the stellar system. Hence the stellar positions and proper motions, and the celestial reference coordinate system are essential to preserve the system of the Earth orientation parameters determined by the optical astrometry.
insolence
发表于 2025-3-22 22:55:41
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Brittle
发表于 2025-3-23 03:19:23
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PLE
发表于 2025-3-23 08:58:57
Thomas Hoffmeister,Henning Koch,Peter TrempThe importance of understanding the properties of a data sample which is to be used for calibrating luminosities can hardly be over-emphasized. In an earlier paper (Lutz 1983) I pointed out the methods for dealing with two well-defined cases. In this paper I will elaborate further on the same topic.