The Gefion family (FIN: 516; adj. Gefionian; also known as Ceres family and Minerva family) is an asteroid family located in the intermediate asteroid belt between 2.74 and 2.82 AU at inclinations of 7.4° to 10.5°. The family of S-type asteroids is named after 1272 Gefion and consists of more than 2,500 known members. It had previously been known as the Ceres family. It is still known as Minerva family, named after then thought parent body 93 Minerva, until it was identified to be an interloper into its own family.[1]

Properties

Location and structure of the Gefion family.

The members have proper orbital elements in the approximate ranges[2]

apepip
min2.74 AU0.1208.6°
max2.82 AU0.1489.6°

At the present epoch, the range of osculating orbital elements of these core members is

aei
min2.74 AU0.0817.4°
max2.82 AU0.1810.5°

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[3] 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.

Core members

The core members identified by the Zappalà HCM method survey are shown in the table at right (minus interlopers).[4]

Alternative name and interlopers

Until recently, this family was known as the Ceres family (adj. Cererean) or the Minerva family (adj. Minervian) 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,[5] having a different spectral class from the bulk of the members. Other known interlopers are 255 Oppavia, 374 Burgundia, 2507 Bobone, and 2559 Svoboda.[6] This left the fairly minor asteroid 1272 Gefion as the lowest-numbered member.

List of members

This is a list of the known family members, without the above-mentioned interlopers.[4]

Namea (AU)e
1272 Gefion2.783850.15170
1433 Geramtina2.799480.16918
1751 Herget2.793190.17242
1839 Ragazza2.798980.16824
2053 Nuki2.802600.14050
2157 Ashbrook2.784400.11071
2373 Immo2.794330.17339
2386 Nikonov2.814560.15728
2493 Elmer2.787770.17198
2521 Heidi2.794750.08893
2595 Gudiachvili2.785950.14340
2631 Zhejiang2.797300.16070
2801 Huygens2.799690.17422
2875 Lagerkvist2.797920.09969
2905 Plaskett2.802330.09847
2911 Miahelena2.795200.09303
2977 Chivilikhin2.788840.16849
3724 Annenskij2.762930.16535
3788 Steyaert2.793070.10127
3860 Plovdiv2.805860.15548
3910 Liszt2.794420.13349
3964 Danilevskij2.758220.16608
4020 Dominique2.776260.15885
4096 Kushiro2.809890.15066
4182 Mount Locke2.798060.13498
4702 Berounka2.793870.09181
5159 Burbine2.789790.10861
5401 Minamioda2.794630.15238
Namea (AU)e
(5622) 1990 TL42.800830.17319
5685 Sanenobufukui2.799670.09267
5712 Funke2.774960.16644
5823 Oryo2.776380.16166
5955 Khromchenko2.802340.09628
6044 Hammer-Purgstall2.774890.15517
6078 Burt2.803920.17351
6211 Tsubame2.756420.09601
6594 Tasman2.781520.15916
7094 Godaisan2.780880.16534
7211 Xerxes2.798700.16302
7272 Darbydyar2.782200.09822
(7397) 1986 QS2.782550.16568
7451 Verbitskaya2.812400.16818
(7576) 1990 BN2.783490.10158
7651 Villeneuve2.782450.14156
7735 Scorzelli2.756940.16628
(8334) 1984 CF2.785910.09965
8440 Wigeon2.780160.14078
8451 Gaidai2.772530.16753
(8511) 1991 PY102.769920.15337
(8659) 1990 SE112.781760.15170
8819 Chrisbondi2.780980.17028
(9173) 1989 TZ152.790530.11959
9511 Klingsor2.767840.14054
10245 Inselsberg2.780040.09434
(10335) 1991 PG92.793600.15011
10649 VOC2.815780.12154
Namea (AU)e
10665 Ortigão2.798510.15765
12275 Marcelgoffin2.763150.15291
12279 Laon2.769900.09282
(15216) 1981 EX142.812100.10526
(16188) 2000 AH1752.768100.16222
(16283) 2545 P-L2.765750.17269
(16344) 2370 T-32.815250.15026
(17344) 1120 T-32.785140.15738
(17480) 1991 PE102.787850.17691
(18351) 1990 QN52.789870.17546
19994 Tresini2.774680.17725
(22259) 1979 MD52.758280.11401
(24623) 1979 MD82.761960.10315
(26026) 4664 P-L2.813910.17207
(26032) 6556 P-L2.804450.18117
(26099) 1989 WH2.761960.14457
(26799) 1979 XL2.786490.11048
(29038) 4030 T-12.798520.15112
(29043) 2024 T-22.763770.14769
(30655) 2289 T-12.772250.10578
(30731) 1981 EK22.757020.12711
(34961) 2252 T-22.764690.16515
(35013) 1981 EL32.743680.08177
(37508) 3190 T-22.776350.10965
(43734) 1979 MY72.761540.11756
(48348) 4124 P-L2.793370.16135
(85188) 1991 PK122.784910.17877
(117991) 1033 T-22.80350.1627

References

  1. Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. S2CID 119280014.
  2. 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
  3. AstDys Archived February 20, 2006, at the Wayback Machine
  4. 1 2 The asteroid families data set is taken from "Archived copy". Archived from the original on February 1, 2004. Retrieved December 26, 2005.{{cite web}}: CS1 maint: archived copy as title (link) with updated names and numbers as of April 2005
  5. 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).
  6. Identified by inspection of the SMASSII data set Archived January 5, 2006, at the Wayback Machine, S.J. Bus and R.P. Binzel, Phase II of the Small Main-Belt Asteroid Spectroscopic Survey, Icarus Vol. 158, p. 106 (2002).
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