Gefion family

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Template:Short description The Gefion family (FIN: 516; adj. Gefionian; also known as the Ceres family or the 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

File:Gefion family.png
Location and structure of the Gefion family.

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

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[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.

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,[4] having a different spectral class from the bulk of the members. Other known interlopers are 255 Oppavia, 374 Burgundia, 2507 Bobone, and 2559 Svoboda.[5] 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.[6]

Name a (AU) 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
Name a (AU) e
Template:Mpl 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 Darbydyar 2.78220 0.09822
(7397) 1986 QS 2.78255 0.16568
7451 Verbitskaya 2.81240 0.16818
Template:Mp 2.78349 0.10158
7651 Villeneuve 2.78245 0.14156
7735 Scorzelli 2.75694 0.16628
Template:Mp 2.78591 0.09965
8440 Wigeon 2.78016 0.14078
8451 Gaidai 2.77253 0.16753
Template:Mpl 2.76992 0.15337
Template:Mpl 2.78176 0.15170
8819 Chrisbondi 2.78098 0.17028
Template:Mpl 2.79053 0.11959
9511 Klingsor 2.76784 0.14054
10245 Inselsberg 2.78004 0.09434
Template:Mpl 2.79360 0.15011
10649 VOC 2.81578 0.12154
Name a (AU) e
10665 Ortigão 2.79851 0.15765
12275 Marcelgoffin 2.76315 0.15291
12279 Laon 2.76990 0.09282
Template:Mp 2.81210 0.10526
Template:Mp 2.76810 0.16222
Template:Mp 2.76575 0.17269
Template:Mp 2.81525 0.15026
Template:Mp 2.78514 0.15738
Template:Mpl 2.78785 0.17691
Template:Mpl 2.78987 0.17546
19994 Tresini 2.77468 0.17725
Template:Mp 2.75828 0.11401
Template:Mp 2.76196 0.10315
Template:Mp 2.81391 0.17207
Template:Mp 2.80445 0.18117
(26099) 1989 WH 2.76196 0.14457
(26799) 1979 XL 2.78649 0.11048
Template:Mp 2.79852 0.15112
Template:Mp 2.76377 0.14769
Template:Mp 2.77225 0.10578
Template:Mp 2.75702 0.12711
Template:Mp 2.76469 0.16515
Template:Mp 2.74368 0.08177
Template:Mp 2.77635 0.10965
Template:Mp 2.76154 0.11756
Template:Mp 2.79337 0.16135
Template:Mpl 2.78491 0.17877
Template:Mp 2.8035 0.1627

References

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  1. ↑ Script error: No such module "citation/CS1".
  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 Template:Webarchive
  4. ↑ 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).
  5. ↑ Identified by inspection of the SMASSII data set Template:Webarchive, S.J. Bus and R.P. Binzel, Phase II of the Small Main-Belt Asteroid Spectroscopic Survey, Icarus Vol. 158, p. 106 (2002).
  6. ↑ The asteroid families data set is taken from Script error: No such module "citation/CS1". with updated names and numbers as of April 2005

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