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HD 217145


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ICCD Speckle Observations of Binary Stars.XV.An Investigation of Lunar Occultation Systems
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1996AJ....112.2260M&db_key=AST

Derivation of angular diameters of stars from lunar occultations
A description is presented of the results obtained in the photoelectricobservations of occultations involving four stars. The considered starsinclude Eta Gem (ZC 946), Mu Gem (ZC 976), 187 B. Gem (ZC 1161), and 31Leo (ZC 1486). The theoretical principles of the studies are considered,taking into account point source occultations, the stellar diameter andthe influence of telescope aperture, and spectral effects. Observationaldata concerning the considered stars are presented in a table and anumber of graphs. It is pointed out that Mu Gem is a triple system.However, on account of their distances and their weakness the companionscannot affect the observed intensity curve. A combination of the deriveddiameter with the trigonometric parallax reported by Jenkins (1963)provides for the linear diameter of Mu Gem the result of 91 plus orminus 28 solar diameters.

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观测天体数据

星座:寶瓶座
右阿森松:22h58m35.60s
赤纬:-05°40'26.1"
视星:8.498
距离:2325.581 天文距离
右阿森松适当运动:-16
赤纬适当运动:-6.9
B-T magnitude:10.391
V-T magnitude:8.655

目录:
适当名称
HD 1989HD 217145
TYCHO-2 2000TYC 5241-1373-1
USNO-A2.0USNO-A2 0825-19825616
HIPHIP 113451

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