EXTOL
发表于 2025-3-25 03:36:03
Friedrich Wilhelm Bessel (1784–1846)stronomer F. W. Bessel. You have given me a welcome opportunity to express an appreciation of Bessel’s work which has marked the beginning of research on the motion of stars and which was pioneer work on astrometric binaries and on the determination of stellar distances. Bessel has established the f
TAP
发表于 2025-3-25 11:08:19
Project HIPPARCOSthe scientific instrumentation and on an explanation of how scientific objectives can be achieved. The purpose is to provide quantitative visibility of basic project features to astronomers and astrophysicists not familiar with astrometric techniques by exploiting updated technical information on pr
reperfusion
发表于 2025-3-25 13:44:41
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美学
发表于 2025-3-25 17:22:29
High Resolution Problems in Astrometry and Spectroscopy of Binaries and Their Significance for the Premarkable evolution has resulted now in the reversed situation with the painful question, at least for some of us: do single stars really exist?.It is recognized by everybody, that many essential properties of stars can only be obtained from observations of close and wide binaries..It is the aim of
floaters
发表于 2025-3-25 23:11:24
Statistical Models for HIPPARCOS Binariesr axes, the mass-ratios, and the eccentricities. The model is ‘calibrated’ to give correct numbers of observed visual binaries and is then used to study the (closer) binaries of relevance for the HIPPARCOS mission. One main purpose is to estimate the influence of astrometric binaries observed by the
byline
发表于 2025-3-26 00:40:23
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军械库
发表于 2025-3-26 07:40:39
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怪物
发表于 2025-3-26 12:16:07
On the Determination of Double Star Orbitsder derivatives in the development of the appropriate equations of condition. Also, some improvements of the Kowalsky-Seeliger method are suggested which improve the accuracy of the orbit used as first approximation.
坚毅
发表于 2025-3-26 13:17:09
Distribution of Astrometric Binaries in Various Galactic Latitudes. < 20° and . > 40° is nearly twice as large as the galactic concentration of stars in general. (b) The astrographic catalogues are not complete in the fainter magnitudes. (c)The large value of the ratio .:.. (observed to optical number of pairs) from Kreiken’s formula shows that almost all stars in
完成
发表于 2025-3-26 19:58:30
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