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HD 154377


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A mass estimate for the companion to the 'Cartwheel' galaxy
The velocity and the velocity dispersion of the elliptical companion tothe ring galaxy known as the 'Cartwheel' are measured. The velocityconfirms the suggestion by Fosbury and Hawarden (1977) that thiscompanion galaxy was the interloper responsible for the ring structure.The mass inferred from the dispersion is only 5-10% of the mass of theCartwheel itself as determined from the kinematics of the ring. It ispointed out that this low mass is not sufficient to account for theobserved ring by the collisionless kinematic model of Lynds and Toomre(1976). It is thought likely, however, that whereas the underlyingmechanism is an encounter of the kind suggested by Lynds and Toomre, thering is brightened by the star formation induced.

Spectral and Luminosity Classification of the Bright Sequence Stars in the C Regions.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1955ApJ...121...32N&db_key=AST

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观测天体数据

星座:武仙座
右阿森松:17h04m32.54s
赤纬:+14°46'42.6"
视星:9.745
右阿森松适当运动:13.9
赤纬适当运动:-3.2
B-T magnitude:11.173
V-T magnitude:9.863

目录:
适当名称   (Edit)
HD 1989HD 154377
TYCHO-2 2000TYC 988-201-1
USNO-A2.0USNO-A2 0975-08798967
HIPHIP 83552

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