Gefion family

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Name	a	e
1272 Gefion	2.78385	0.15170
1433 Geramtina	2.79948	0.16918
1751 Herget	2.79319	0.17242
1839 Ragazza	2.79898	0.16824
2053 Nuki	2.80260	0.14050
2157 Ashbrook	2.78440	0.11071
2373 Immo	2.79433	0.17339
2386 Nikonov	2.81456	0.15728
2493 Elmer	2.78777	0.17198
2521 Heidi	2.79475	0.08893
2595 Gudiachvili	2.78595	0.14340
2631 Zhejiang	2.79730	0.16070
2801 Huygens	2.79969	0.17422
2875 Lagerkvist	2.79792	0.09969
2905 Plaskett	2.80233	0.09847
2911 Miahelena	2.79520	0.09303
2977 Chivilikhin	2.78884	0.16849
3724 Annenskij	2.76293	0.16535
3788 Steyaert	2.79307	0.10127
3860 Plovdiv	2.80586	0.15548
3910 Liszt	2.79442	0.13349
3964 Danilevskij	2.75822	0.16608
4020 Dominique	2.77626	0.15885
4096 Kushiro	2.80989	0.15066
4182 Mount Locke	2.79806	0.13498
4702 Berounka	2.79387	0.09181
5159 Burbine	2.78979	0.10861
5401 Minamioda	2.79463	0.15238
(5622) 1990 TL₄	2.80083	0.17319
5685 Sanenobufukui	2.79967	0.09267
5712 Funke	2.77496	0.16644
5823 Oryo	2.77638	0.16166
5955 Khromchenko	2.80234	0.09628
6044 Hammer-Purgstall	2.77489	0.15517
6078 Burt	2.80392	0.17351
6211 Tsubame	2.75642	0.09601
6594 Tasman	2.78152	0.15916
7094 Godaisan	2.78088	0.16534
7211 Xerxes	2.79870	0.16302
(7272) 1980 DD₁	2.78220	0.09822
(7397) 1986 QS	2.78255	0.16568
7451 Verbitskaya	2.81240	0.16818
(7576) 1990 BN	2.78349	0.10158
7651 Villeneuve	2.78245	0.14156
(7735) 1980 UL₁	2.75694	0.16628
(8334) 1984 CF	2.78591	0.09965
8440 Wigeon	2.78016	0.14078
8451 Gaidai	2.77253	0.16753
(8511) 1991 PY₁₀	2.76992	0.15337
(8659) 1990 SE₁₁	2.78176	0.15170
(8819) 1985 RR₄	2.78098	0.17028
(9173) 1989 TZ₁₅	2.79053	0.11959
9511 Klingsor	2.76784	0.14054
10245 Inselsberg	2.78004	0.09434
(10335) 1991 PG₉	2.79360	0.15011
10649 VOC	2.81578	0.12154
10665 Ortigão	2.79851	0.15765
12275 Marcelgoffin	2.76315	0.15291
12279 Laon	2.76990	0.09282
(15216) 1981 EX₁₄	2.81210	0.10526
(16188) 2000 AH₁₇₅	2.76810	0.16222
(16283) 2545 P-L	2.76575	0.17269
(16344) 2370 T-3	2.81525	0.15026
(17344) 1120 T-3	2.78514	0.15738
(17480) 1991 PE₁₀	2.78785	0.17691
(18351) 1990 QN₅	2.78987	0.17546
19994 Tresini	2.77468	0.17725
(22259) 1979 MD₅	2.75828	0.11401
(24623) 1979 MD₈	2.76196	0.10315
(26026) 4664 P-L	2.81391	0.17207
(26032) 6556 P-L	2.80445	0.18117
(26099) 1989 WH	2.76196	0.14457
(26799) 1979 XL	2.78649	0.11048
(29038) 4030 T-1	2.79852	0.15112
(29043) 2024 T-2	2.76377	0.14769
(30655) 2289 T-1	2.77225	0.10578
(30731) 1981 EK₂	2.75702	0.12711
(34961) 2252 T-2	2.76469	0.16515
(35013) 1981 EL₃	2.74368	0.08177
(37508) 3190 T-2	2.77635	0.10965
(43734) 1979 MY₇	2.76154	0.11756
(48348) 4124 P-L	2.79337	0.16135
(85188) 1991 PK₁₂	2.78491	0.17877
(117991) 1033 T-2	2.8035	0.1627

The Gefion family of asteroids is a grouping of S-type asteroids in the intermediate main belt.

Location and structure of the Gefion family.

1 Properties
2 Ceres family, Minerva family, and interlopers
3 Core members
4 References

[edit] Properties

The members have proper orbital elements in the approximate ranges^[1]

	a_p	e_p	i_p
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^[2] 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.

[edit] Ceres family, Minerva family, and interlopers

Until recently, this family was known as the Ceres family or the Minerva family after 1 Ceres (the largest asteroid) or 93 Minerva. However, spectroscopic analyses showed that these largest members were in fact interlopers in their own family,^[3] having a different spectral class from the bulk of the members. Other known interlopers are 255 Oppavia, 374 Burgundia, 2507 Bobone, and 2559 Svoboda.^[4] This left the fairly minor asteroid 1272 Gefion as the lowest-numbered member.

[edit] Core members

The core members identified by the Zappalà HCM method survey are shown in the table at right (minus interlopers).^[5]

[edit] References

^ 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
^ AstDys
^ A. Cellino et al "Spectroscopic Properties of Asteroid Families", in Asteroids III, p. 633-643, University of Arizona Press (2002). (Table on page 636, in particular).
^ Identified by inspection of the SMASSII dataset, S.J. Bus and R.P. Binzel, Phase II of the Small Main-Belt Asteroid Spectroscopic Survey, Icarus Vol. 158, p. 106 (2002).
^ The asteroid families data set is taken from http://pdssbn.astro.umd.edu/SBNast/archive/FAMILY/family.tab with updated names and numbers as of april 2005

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