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艾琳达族

艾琳达家族小行星的一族,轨道长半径约在2.5AU离心率则在0.4~0.65之间,因为在1918年被马克斯·沃尔夫发现的第一颗命名(887) 艾琳达而得名。

这个家族占有与木星为1:3,并与地球为4:1的的轨道共振位置。在此处的天体因为共振的缘故,轨道离心率会因为木星的引力作用缓慢且稳定的增加,直到与内部的行星近距离的遭遇才能打破共振的关系。

一些艾琳达家族成员的近日点非常靠近地球的轨道,而因为4:1的轨道周期,因此几乎都会很准确的每隔4年与地球接近一次。

一个重要意义是,如果一颗艾琳达小行星在不利于观测的位置上接近地球(小的离日度-与太阳之间分离的角度),则这种状态将持续数十年。实际上,在2004年,艾琳达家族的(3360) 1981 VA和(1915)Quetzálcoatl从1985年起就未再被观测到,(2068)2608 Seneca从1994年起也未被观测到。

另一个重要的意义是,这些小行星会很接近地球,因此可以提供良好的机会以地基的雷达进行研究。例如,(4179)杜塔提斯(Toutatis)和(6489) Golevka。

一些艾琳达家族的成员列于下表:

名称 a e
887 Alinda 2.48422 0.56356
1429 Pemba 2.55185 0.33858
1550 Tito 2.54673 0.30984
1607 Mavis 2.54783 0.30741
1915 Quetzálcoatl 2.54207 0.57170
2608 Seneca 2.5035 0.57620
(3360) 1981 VA 2.46803 0.74295
3628 Božněmcová 2.53691 0.30052
3806 Tremaine 2.54058 0.31301
4179 Toutatis 2.51005 0.63423
5847 Wakiya 2.54442 0.30086
5864 Montgolfier 2.55866 0.32007
6318 Cronkite 2.51002 0.46522
(6322) 1991 CQ 2.51628 0.47349
6489 Golevka 2.50768 0.60382
(6491) 1991 OA 2.50959 0.58946
7092 Cadmus 2.52493 0.70202
7345 Happer 2.45047 0.32467
(7568) 1988 VJ2 2.52739 0.33216
(7569) 1989 BK 2.54950 0.30348
7638 Gladman 2.53634 0.31606
(8201) 1994AH2 2.53362 0.70851
8709 Kadlu 2.53497 0.48432
(9047) 1991 QF 2.52479 0.31661
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艾琳达族
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