2005/04/01 | 霍姆伯格半径[Holmberg Radius]
类别(¤〖天文〗) | 评论(0) | 阅读(41) | 发表于 16:10
The radius of the isophote of an elliptical galaxy corresponding to a surface brightness of 26.5 blue magnitudes per square arcsecond.
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