Gefion family
Encyclopedia
Name a e
1272 Gefion
1272 Gefion
1272 Gefion is an asteroid from the asteroid belt discovered on October 10, 1931 by Reinmuth, K. at Heidelberg.-References:...

 
2.78385 0.15170
1433 Geramtina
1433 Geramtina
1433 Geramtina is a main-belt asteroid discovered on October 30, 1937 by Eugène Joseph Delporte at the Royal Observatory of Belgium. This asteroid is named for the sister of B. Asplind.-References:...

 
2.79948 0.16918
1751 Herget
1751 Herget
1751 Herget is the name of an asteroid which was discovered at Goethe Link Observatory near Brooklyn, Indiana by the Indiana Asteroid Program....

 
2.79319 0.17242
1839 Ragazza
1839 Ragazza
1839 Ragazza is a main-belt asteroid discovered on October 20, 1971 by P. Wild at Zimmerwald.- External links :*...

 
2.79898 0.16824
2053 Nuki
2053 Nuki
2053 Nuki is a main-belt asteroid discovered on October 24, 1976 by R. M. West at La Silla.- External links :*...

 
2.80260 0.14050
2157 Ashbrook
2157 Ashbrook
2157 Ashbrook is a main-belt asteroid discovered on March 7, 1924 by K. Reinmuth at Heidelberg.- External links :*...

 
2.78440 0.11071
2373 Immo
2373 Immo
2373 Immo is a main-belt asteroid discovered on August 4, 1929 by Max Wolf at Heidelberg. It is named after the German astronomer Immo Appenzeller.- External links :*...

 
2.79433 0.17339
2386 Nikonov
2386 Nikonov
2386 Nikonov is a main-belt asteroid discovered on September 19, 1974 by L. Chernykh at Nauchnyj.- External links :*...

 
2.81456 0.15728
2493 Elmer
2493 Elmer
2493 Elmer is a main-belt asteroid discovered on December 1, 1978 by Harvard College at Agassiz Station.- External links :*...

 
2.78777 0.17198
2521 Heidi
2521 Heidi
This small asteroid is named after Johanna Spyri's well-known book, Heidi....

 
2.79475 0.08893
2595 Gudiachvili
2595 Gudiachvili
2595 Gudiachvili is a main-belt asteroid discovered on May 19, 1979 by Richard Martin West at La Silla Observatory.- External links :...

 
2.78595 0.14340
2631 Zhejiang
2631 Zhejiang
2631 Zhejiang is a main-belt asteroid discovered on October 7, 1980 by Purple Mountain Observatory at Nanking.- External links :*...

 
2.79730 0.16070
2801 Huygens
2801 Huygens
2801 Huygens is a small main belt asteroid, which was discovered by Hendrik van Gent in 1935. It belongs to the Gefion family of asteroids. It is named after Christiaan Huygens, the Dutch astronomer, mathematician and physicist....

 
2.79969 0.17422
2875 Lagerkvist
2875 Lagerkvist
2875 Lagerkvist is a main-belt asteroid discovered on February 11, 1983 by E. Bowell at Flagstaff .- External links :*...

 
2.79792 0.09969
2905 Plaskett
2905 Plaskett
2905 Plaskett is a main-belt asteroid discovered on January 24, 1982 by Ted Bowell at Flagstaff . It is named after the Canadian astronomers John Stanley Plaskett and Harry Hemley Plaskett.-References:...

 
2.80233 0.09847
2911 Miahelena
2911 Miahelena
2911 Miahelena is a main-belt asteroid discovered on April 8, 1938 by H. Alikoski at Turku.- External links :*...

 
2.79520 0.09303
2977 Chivilikhin
2977 Chivilikhin
2977 Chivilikhin is a main-belt asteroid discovered on September 19, 1974 by Chernykh, L. at Nauchnyj.- External links :*...

 
2.78884 0.16849
3724 Annenskij
3724 Annenskij
3724 Annenskij is a main-belt asteroid discovered on December 23, 1979 by Zhuravleva, L. at Nauchnyj.- External links :*...

 
2.76293 0.16535
3788 Steyaert
3788 Steyaert
3788 Steyaert is a main-belt asteroid discovered on August 29, 1986 by H. Debehogne at the European Southern Observatory. It is named after the Belgian astronomer Chris Steyaert .- External links :*...

 
2.79307 0.10127
3860 Plovdiv
3860 Plovdiv
3860 Plovdiv is a main-belt asteroid discovered on August 8, 1986 by E. W. Elst and Ivanova Elst at Rozhen.- External links :*...

 
2.80586 0.15548
3910 Liszt
3910 Liszt
3910 Liszt is a main-belt asteroid discovered on September 16, 1988 by E. W. Elst at Haute-Provence Observatory. It was named after Hungarian composer Ferenc Liszt.- External links :*...

 
2.79442 0.13349
3964 Danilevskij
3964 Danilevskij
3964 Danilevskij is a main-belt asteroid discovered on September 12, 1974 by Zhuravleva, L. at Nauchnyj.- External links :*...

 
2.75822 0.16608
4020 Dominique
4020 Dominique
4020 Dominique is a main-belt asteroid discovered on March 1, 1981 by Bus, S. J. at Siding Spring.- External links :*...

 
2.77626 0.15885
4096 Kushiro
4096 Kushiro
4096 Kushiro is a main-belt asteroid discovered on November 15, 1987 by Seiji Ueda and Hiroshi Kaneda at Kushiro.- External links :*...

 
2.80989 0.15066
4182 Mount Locke
4182 Mount Locke
4182 Mount Locke is a main-belt asteroid discovered on May 2, 1951 by Yerkes-McDonald at Fort Davis, Texas.- External links :*...

 
2.79806 0.13498
4702 Berounka
4702 Berounka
4702 Berounka is a main-belt asteroid discovered on April 23, 1987 by A. Mrkos at Klet.- External links :*- Notes :...

 
2.79387 0.09181
5159 Burbine
5159 Burbine
5159 Burbine is a main-belt asteroid discovered on September 9, 1977 by Harvard Observatory at Harvard. It is named after former Mt. Holyoke College professor and current Bates College astronomy professor Tom Burbine.- External links :*...

 
2.78979 0.10861
5401 Minamioda
5401 Minamioda
5401 Minamioda is a main-belt asteroid discovered on March 6, 1989 by T. Nomura and K. Kawanishi at Minami-Oda.- External links :*...

 
2.79463 0.15238
2.80083 0.17319
5685 Sanenobufukui
5685 Sanenobufukui
5685 Sanenobufukui is a main-belt asteroid discovered on December 8, 1990 by T. Nomura and K. Kawanishi at Minami-Oda.- External links :*...

 
2.79967 0.09267
5712 Funke
5712 Funke
5712 Funke is a main-belt asteroid discovered on September 25, 1979 by A. Mrkos at Klet.- External links :*...

 
2.77496 0.16644
5823 Oryo
5823 Oryo
5823 Oryo is a main-belt asteroid discovered on December 20, 1989 by T. Seki at Geisei.- External links :*...

 
2.77638 0.16166
5955 Khromchenko
5955 Khromchenko
5955 Khromchenko is a main-belt asteroid discovered on September 2, 1987 by L. I. Chernykh at the Crimean Astrophysical Observatory.- External links :*...

 
2.80234 0.09628
6044 Hammer-Purgstall
6044 Hammer-Purgstall
6044 Hammer-Purgstall is a main belt asteroid with an orbital period of 1687.0813666 days .The asteroid was discovered on September 13, 1991.-References:...

 
2.77489 0.15517
6078 Burt
6078 Burt
6078 Burt is a main-belt asteroid discovered on October 10, 1980 by Shoemaker, C. S. at Palomar.- External links :*...

 
2.80392 0.17351
6211 Tsubame
6211 Tsubame
6211 Tsubame is a main-belt asteroid discovered on February 19, 1991 by S. Inoda and T. Urata at the Karasuyama Astronomical Observatory.- External links :*...

 
2.75642 0.09601
6594 Tasman
6594 Tasman
6594 Tasman is a main-belt asteroid discovered on June 25, 1987 by A. Mrkos at Klet.- External links :*...

 
2.78152 0.15916
7094 Godaisan
7094 Godaisan
7094 Godaisan is a main-belt asteroid discovered on September 4, 1992 by T. Seki at Geisei.It is named after Mount Godaisan, a small mountain in the Japanese city of Kochi- External links :*...

 
2.78088 0.16534
7211 Xerxes
7211 Xerxes
7211 Xerxes is a main-belt asteroid discovered on March 25, 1971 by Cornelis Johannes van Houten, Ingrid van Houten-Groeneveld and Tom Gehrels at Palomar Observatory.- External links :*...

 
2.79870 0.16302
7272 Darbydyar
7272 Darbydyar
7272 Darbydyar is a main belt asteroid with an orbital period of 1694.0049260 days . The asteroid was discovered on February 21, 1980.-References:...

 
2.78220 0.09822
(7397) 1986 QS
(7397) 1986 QS
1986 QS is a main-belt minor planet. It was discovered by Henri Debehogne at the La Silla Observatory in Chile on August 26, 1986.-References:...

 
2.78255 0.16568
7451 Verbitskaya
7451 Verbitskaya
7451 Verbitskaya is a main-belt asteroid discovered on August 8, 1978 by N. S. Chernykh at the Crimean Astrophysical Observatory.- External links :*...

 
2.81240 0.16818
(7576) 1990 BN  2.78349 0.10158
7651 Villeneuve
7651 Villeneuve
7651 Villeneuve is a main belt asteroid with an orbital period of 1695.4519877 days . The asteroid was discovered on November 15, 1990.-References:...

 
2.78245 0.14156
7735 Scorzelli
7735 Scorzelli
7735 Scorzelli is a main-belt asteroid discovered on October 31, 1980 by S. J. Bus at Palomar.- External links :*...

 
2.75694 0.16628
(8334) 1984 CF  2.78591 0.09965
8440 Wigeon
8440 Wigeon
8440 Wigeon is a main-belt asteroid discovered on October 17, 1977 by Cornelis Johannes van Houten, Ingrid van Houten-Groeneveld and Tom Gehrels at Palomar Observatory.- External links :*...

 
2.78016 0.14078
8451 Gaidai
8451 Gaidai
8451 Gaidai is a main-belt asteroid discovered on September 11, 1977 by N. S. Chernykh at the Crimean Astrophysical Observatory.- External links :*...

 
2.77253 0.16753
2.76992 0.15337
2.78176 0.15170
8819 Chrisbondi
8819 Chrisbondi
8819 Chrisbondi is a main belt asteroid with an orbital period of 1695.8484499 days . The asteroid was discovered on September 14, 1985.-References:...

 
2.78098 0.17028
2.79053 0.11959
9511 Klingsor
9511 Klingsor
- External links :*...

 
2.76784 0.14054
10245 Inselsberg
10245 Inselsberg
10245 Inselsberg is a main-belt asteroid discovered on September 24, 1960 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.- External links :*...

 
2.78004 0.09434
2.79360 0.15011
10649 VOC
10649 VOC
10649 VOC is a main belt asteroid with an orbital period of 1723.0155778 days . The asteroid was discovered on September 24, 1960.-References:...

 
2.81578 0.12154
10665 Ortigão
10665 Ortigão
10665 Ortigão is a main belt asteroid with an orbital period of 1708.9510202 days . The asteroid was discovered on October 16, 1977.-References:...

 
2.79851 0.15765
12275 Marcelgoffin
12275 Marcelgoffin
- External links :*...

 
2.76315 0.15291
12279 Laon
12279 Laon
12279 Laon is a main-belt asteroid discovered on November 16, 1990 by E. W. Elst at the European Southern Observatory.- External links :*...

 
2.76990 0.09282
2.81210 0.10526
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
2.78785 0.17691
2.78987 0.17546
19994 Tresini
19994 Tresini
19994 Tresini is a main-belt asteroid discovered on October 13, 1990 by L. G. Karachkina and G. R. Kastel' at the Crimean Astrophysical Observatory.- External links :*...

 
2.77468 0.17725
2.75828 0.11401
2.76196 0.10315
(26026) 4664 P-L  2.81391 0.17207
(26032) 6556 P-L  2.80445 0.18117
(26099) 1989 WH
(26099) 1989 WH
1989 WH is a main-belt minor planet. It was discovered by Yoshiaki Oshima at the Gekko Observatory in the Shizuoka Prefecture of Japan, on November 20, 1989.-References:...

 
2.76196 0.14457
(26799) 1979 XL
(26799) 1979 XL
1979 XL is a main-belt minor planet. It was discovered by Henri Debehogne and Edgar Rangel Netto at the La Silla Observatory in Chile on December 15, 1979.-References:...

 
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
2.75702 0.12711
(34961) 2252 T-2  2.76469 0.16515
2.74368 0.08177
(37508) 3190 T-2  2.77635 0.10965
2.76154 0.11756
(48348) 4124 P-L  2.79337 0.16135
2.78491 0.17877
(117991) 1033 T-2  2.8035 0.1627

The Gefion family of asteroids
Asteroid family
An asteroid family is a population of asteroids that share similar proper orbital elements, such as semimajor axis, eccentricity, and orbital inclination. The members of the families are thought to be fragments of past asteroid collisions...

 is a grouping of S-type
S-type asteroid
S-type asteroids are of a stony composition, hence the name. Approximately 17% of asteroids are of this type, making it the second most common after the C-type.-Characteristics:...

 asteroid
Asteroid
Asteroids are a class of small Solar System bodies in orbit around the Sun. They have also been called planetoids, especially the larger ones...

s in the intermediate main belt.

Properties

The members have proper orbital elements
Proper orbital elements
The proper orbital elements of an orbit are constants of motion of an object in space that remain practically unchanged over an astronomically long timescale...

 in the approximate ranges
! !! ap
Semi-major axis
The major axis of an ellipse is its longest diameter, a line that runs through the centre and both foci, its ends being at the widest points of the shape...

!! ep !! ip
Inclination
Inclination in general is the angle between a reference plane and another plane or axis of direction.-Orbits:The inclination is one of the six orbital parameters describing the shape and orientation of a celestial orbit...

>
min 2.74 AU
Astronomical unit
An astronomical unit is a unit of length equal to about or approximately the mean Earth–Sun distance....

 
0.120 8.6°
max 2.82 AU 0.148 9.6°


At the present epoch
Epoch (astronomy)
In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as celestial coordinates, or elliptical orbital elements of a celestial body, where these are subject to perturbations and vary with time...

, the range of osculating
Osculating orbit
In astronomy, and in particular in astrodynamics, the osculating orbit of an object in space is the gravitational Kepler orbit In astronomy, and in particular in astrodynamics, the osculating orbit of an object in space (at a given moment of time) is the gravitational Kepler orbit In astronomy,...

 orbital elements
Orbital elements
Orbital elements are the parameters required to uniquely identify a specific orbit. In celestial mechanics these elements are generally considered in classical two-body systems, where a Kepler orbit is used...

 of these core members is
a
Semi-major axis
The major axis of an ellipse is its longest diameter, a line that runs through the centre and both foci, its ends being at the widest points of the shape...

e i
Inclination
Inclination in general is the angle between a reference plane and another plane or axis of direction.-Orbits:The inclination is one of the six orbital parameters describing the shape and orientation of a celestial orbit...

min 2.74 AU
Astronomical unit
An astronomical unit is a unit of length equal to about or approximately the mean Earth–Sun distance....

 
0.081 7.4°
max 2.82 AU 0.18 10.5°


The namesake is 1272 Gefion
1272 Gefion
1272 Gefion is an asteroid from the asteroid belt discovered on October 10, 1931 by Reinmuth, K. at Heidelberg.-References:...

. 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
2631 Zhejiang
2631 Zhejiang is a main-belt asteroid discovered on October 7, 1980 by Purple Mountain Observatory at Nanking.- External links :*...

 has a diameter of 34 km, and is the largest core member whose diameter has been reliably estimated, although 2911 Miahelena
2911 Miahelena
2911 Miahelena is a main-belt asteroid discovered on April 8, 1938 by H. Alikoski at Turku.- External links :*...

 is brighter, and would have a rough diameter of about 47 km, given the same (very low) albedo of 0.025.

Ceres family, Minerva family, and interlopers

Until recently, this family was known as the Ceres family or the Minerva family after 1 Ceres
1 Ceres
Ceres, formally 1 Ceres, is the smallest identified dwarf planet in the Solar System and the only one in the asteroid belt. With a diameter of about 950 km, Ceres is by far the largest and most-massive asteroid, comprising about a third of the mass of the asteroid belt. Discovered on 1 January 1801...

 (the largest asteroid) or 93 Minerva
93 Minerva
93 Minerva is a large trinary main-belt asteroid. It is a C-type asteroid, meaning that it has a dark surface and possibly a primitive carbonaceous composition. It was discovered by J. C. Watson on August 24, 1867, and named after Minerva, the Roman equivalent of Athena, goddess of wisdom...

. However, spectroscopic analyses showed that these largest members were in fact interlopers in their own family, having a different spectral class
Asteroid spectral types
Asteroids are assigned a type based on spectral shape, color, and sometimes albedo. These types are thought to correspond to an asteroid's surface composition...

 from the bulk of the members. Other known interlopers are 255 Oppavia
255 Oppavia
255 Oppavia is a sizeable Main belt asteroid. It classified as a dark P-type asteroid.It was discovered by Johann Palisa on March 31, 1886 in Vienna and was named after Opava, town in the Czech Republic , where Palisa was born....

, 374 Burgundia
374 Burgundia
374 Burgundia is a typical Main belt asteroid. It is classified as an S-type asteroid.It was discovered by Auguste Charlois on September 18, 1893 in Nice. It was named for the former French region of Burgandy...

, 2507 Bobone
2507 Bobone
2507 Bobone is a main-belt asteroid discovered on November 18, 1976 by Felix Aguilar Observatory at El Leoncito.- External links :*...

, and 2559 Svoboda
2559 Svoboda
2559 Svoboda is a main-belt asteroid discovered on October 23, 1981 by A. Mrkos at Klet.- External links :*...

. This left the fairly minor asteroid 1272 Gefion
1272 Gefion
1272 Gefion is an asteroid from the asteroid belt discovered on October 10, 1931 by Reinmuth, K. at Heidelberg.-References:...

as the lowest-numbered member.

Core members

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