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The Gefion or Gefionian family of asteroids is a grouping of S-type asteroids in the intermediate asteroid belt. ==Properties== The members have proper orbital elements in the approximate ranges〔according to the HCM analysis by V. Zappalà, Ph. Bendjoya, A. Cellino, P. Farinella and C. Froeschlé, ''(Asteroid Families: Search of a 12,487-Asteroid Sample Using Two Different Clustering Techniques )'', Icarus, Volume 116, Issue 2 (August 1995), pages 291-314〕 At the present epoch, the range of osculating orbital elements of these core members is The namesake is 1272 Gefion. The family is fairly large, e.g. the Zappala 1995 analysis found about a hundred core members. A search of a recent proper element database〔(AstDys )〕 found 766 objects (about 0.8% of the total) lying within the region defined by the first table above. 2631 Zhejiang has a diameter of 34 km, and is the largest core member whose diameter has been reliably estimated, although 2911 Miahelena is brighter, and would have a rough diameter of about 47 km, given the same (very low) albedo of 0.025. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gefion family」の詳細全文を読む スポンサード リンク
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