Griqua asteroid
The Griqua asteroids (also known as the "Griquas") are a dynamical group of asteroids with marginally unstable orbits. The group derives its name from the asteroid 1362 Griqua. The Griquas are located in the Hecuba gap – one of the largest Kirkwood gaps in the asteroid belt at 3.27 AU – and stay in a 2:1 mean motion resonance with the gas giant Jupiter, which gradually perturbes their orbits over a long period until they either intersect with the orbit of Mars or Jupiter itself. The group has an estimated lifetime of 100 to 500 million years.
Beyond the Griquas and the Hecuba gap are the Cybele asteroid, located at 3.27–3.7 AU, followed by the Hilda asteroids and the Jupiter trojans.
Description
Griqua asteroids orbit the Sun between 3.1 and 3.27 AU. Asteroids in this group have eccentricities greater than 0.35.[1][2][3]
Members
Known members of the Griqua group include (articles in boldface):[4]:422
Strongly unstable group
Related but distinct from the Griquas, is the unnamed group of "strongly unstable" resonant asteroids:[4]:422,423
Zhongguo asteroids
While the Griquas are asteroids in a marginally unstable orbit, the Zhongguo asteroids (or "Zhongguos"; named after 3789 Zhongguo) are in a rather stable 1:2 resonance with Jupiter. The group of 26 identified members, with a lifetime of more than 530 million years, can be further divided into two clusters in the pseudo-proper element space:[4]:423
- 3789 Zhongguo
- (11097) 1994 UD1
- 11266 Macke
- 11573 Helmholtz
- 14871 Pyramus
- (16882) 1998 BO13
- (18888) 2000 AV246
- 22740 Rayleigh
- (24514) 2001 BB58
- (26112) 1991 PG18
- 31249 Renéefleming
- (31293) 1998 FP70
- (36140) 1999 RC168
- (37528) 1975 SX
- (37991) 1998 KZ5
- (38984) 2000 UZ4
- (39018) 2000 UM53
- (41262) 1999 XZ55
- (45511) 2000 BC23
- (71694) 2000 FN44
- (86343) 1999 XZ56
- (91182) 1998 RO49
- (102915) 1999 XT23
- (130295) 2000 EF60
- (138739) 2000 SF206
- (146258) 2001 AO22
References
- ↑ EasySky - Screenshots
- ↑ Minor planet groups/families Archived 2010-11-28 at the Wayback Machine.
- ↑ MPEC 2004-J28 : UNUSUAL MINOR PLANETS (2004 MAY 15.0 TT)
- 1 2 3 Roig, F.; Nesvorný, D.; Ferraz-Mello, S. (September 2002). "Asteroids in the 2 : 1 resonance with Jupiter: dynamics and size distribution [ Erratum: 2002MNRAS.336.1391R ]". Monthly Notices of the Royal Astronomical Society. 335 (2): 417–431. Bibcode:2002MNRAS.335..417R. doi:10.1046/j.1365-8711.2002.05635.x. Retrieved 31 March 2017.