1362 Griqua
1362 Griqua, provisional designation 1935 QG1 is a dark, Jupiter-resonant background asteroid on an eccentric, cometary-like orbit and the namesake of the Griqua group, located in the Hecuba gap in the outermost region of the asteroid belt. The carbonaceous asteroid measures approximately 28 kilometers (17 miles) in diameter and has a rotation period of 6.9 hours. It was discovered on 31 July 1935, by South-African astronomer Cyril Jackson at Union Observatory in Johannesburg. The asteroid was named after the Griqua people in South Africa and Namibia.
| Discovery | |
|---|---|
| Discovered by | C. Jackson |
| Discovery site | Johannesburg Obs. |
| Discovery date | 31 July 1935 |
| Designations | |
MPC designation | (1362) Griqua |
Named after | Griqua people (South African tribe) |
Alternative designations | 1935 QG1 · 1931 BN |
Minor planet category | main-belt · (outer) Griqua · background ACO |
| Orbital characteristics | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.03 yr (31,788 d) |
| Aphelion | 4.4123 AU |
| Perihelion | 2.0213 AU |
Semi-major axis | 3.2168 AU |
| Eccentricity | 0.3716 |
Orbital period (sidereal) | 5.77 yr (2,107 d) |
Mean anomaly | 16.650° |
Mean motion | 0° 10m 14.88s / day |
| Inclination | 24.223° |
Longitude of ascending node | 121.34° |
| 261.82° | |
| TJupiter | 2.9490 |
| Physical characteristics | |
Mean diameter | 25.60±3.72 km 26.936±0.363 km 28.36±0.40 km 29.90±1.5 km 29.9±3.0 km 30±3 km 31.0 km (radiometric) |
Synodic rotation period | 6.891±0.0297 h 6.9±0.1 h 6.907±0.003 h 7 h (poor) |
| 0.055 (radiometric) 0.0667±0.007 0.07±0.01 0.075±0.002 0.082±0.013 0.091±0.042 | |
| Tholen = CP B (S3OS2) U–B = 0.360 B–V = 0.720 | |
| 11.18 11.18±0.10 11.561±0.003 (S) | |
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