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HD 72023


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The occultation of gamma Geminorum by the asteroid 381 Myrrha
The occultation of Gamma Geminorum by asteroid 381 Myrrha on January 13,1991, observed in Japan and China, was the brightest event ever seen ofa stellar occultation by an asteroid. By the analysis of the timing dataof this event measured in Japan, it is shown that the cross section ofMyrrha is well fitted with an ellipse of (147.2 +/- 2.4) km x (126.6 +/-7.9) km. An upper limit of the diameter of Gamma Geminorum is alsoestimated to be 2.6 milliarcsec. The companion of Gamma Geminorum ofabout 7.5 mag was sited at separation (64 +/- 8) milliarcsec in thedirection P = 129 deg +/- 59 deg, and the relative position of Myrrha toGamma Geminorum was determined to an accuracy of about 1 milliarcsec.Direct constraints on Myrrha's 3D shape and the direction of itsrotation axis are obtained on the assumption of it being a triaxialellipsoid with isotropic orientation.

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观测天体数据

星座:巨蟹座
右阿森松:08h31m29.20s
赤纬:+24°58'52.2"
视星:8.504
距离:561.798 天文距离
右阿森松适当运动:0.3
赤纬适当运动:1.2
B-T magnitude:10.744
V-T magnitude:8.689

目录:
适当名称   (Edit)
HD 1989HD 72023
TYCHO-2 2000TYC 1941-596-1
USNO-A2.0USNO-A2 1125-05652706
HIPHIP 41812

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