Properties
The members have proper orbital elements in the approximate ranges
| ap | ep | ip | |
|---|---|---|---|
| min | 2.74 AU | 0.120 | 8.6° |
| max | 2.82 AU | 0.148 | 9.6° |
At the present epoch, the range of osculating orbital elements of these core members is
| a | e | i | |
|---|---|---|---|
| min | 2.74 AU | 0.081 | 7.4° |
| max | 2.82 AU | 0.18 | 10.5° |
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 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.
Read more about this topic: Gefion Family
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