Gefion family

      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 Darbydyar 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 Scorzelli 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 Chrisbondi 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 or Gefionian family of asteroids is a grouping of S-type asteroids in the intermediate asteroid belt.

      Location and structure of the Gefion family.

      Properties

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

      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[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.

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      Ceres family, Minerva family, and interlopers

      Until recently, this family was known as the Ceres (Cererean) family or the Minerva (Minervian) 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.

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      Core members

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

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      References

      1. ^ 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
      2. ^ AstDys
      3. ^ 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).
      4. ^ Identified by inspection of the SMASSII data set, S.J. Bus and R.P. Binzel, Phase II of the Small Main-Belt Asteroid Spectroscopic Survey, Icarus Vol. 158, p. 106 (2002).
      5. ^ 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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      Last modified on 26 February 2013, at 01:09