1922 Zulu
| Discovery | |
|---|---|
| Discovered by | E. Johnson |
| Discovery site | Johannesburg Obs. |
| Discovery date | 25 April 1949 |
| Designations | |
| MPC designation | (1922) Zulu |
|
Named after
|
Zulu (tribe) |
| 1949 HC | |
|
main-belt · (outer) Griqua |
|
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 67.70 yr (24,727 days) |
| Aphelion | 4.7945 AU |
| Perihelion | 1.6775 AU |
| 3.2360 AU | |
| Eccentricity | 0.4816 |
| 5.82 yr (2,126 days) | |
| 187.91° | |
| 0° 10m 9.48s / day | |
| Inclination | 35.446° |
| 226.53° | |
| 31.395° | |
| Earth MOID | 0.7153 AU |
| Jupiter MOID | 0.6296 AU |
| Physical characteristics | |
| Dimensions |
12.41±2.60 km 19.30 km (calculated) 20.561±0.321 km |
|
18.64±0.01 h 18.65 h |
|
|
0.055±0.006 0.057 (assumed) 0.16±0.05 |
|
| C | |
| 12.2 · 12.27±0.24 · 12.3 | |
1922 Zulu, provisional designation 1949 HC, is a carbonaceous Griqua asteroid from the outermost regions of the asteroid belt, approximately 20 kilometers in diameter. It was discovered on 25 April 1949, by South African astronomer Ernest Johnson at Union Observatory in Johannesburg, and named for the South African Zulu people.
Zulu is the second largest member of the Griqua family, a small and moderately-to-strongly unstable group of asteroids located near the 2 : 1 orbital resonance with the gas giant Jupiter, that corresponds to one of the prominent Kirkwood gaps in the asteroid belt. It orbits the Sun at a distance of 1.7–4.8 AU once every 5 years and 10 months (2,126 days). Its orbit has an eccentricity of 0.48 and an inclination of 35° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Johannesburg, as no precoveries were taken and no prior identifications were made.
Zulu was lost shortly after its 1949-discovery (see Lost asteroid), and only rediscovered in 1974 by Richard Eugene McCrosky, Cheng-yuan Shao and JH Bulger based on a predicted position by C. M. Bardwell of the Cincinnati Observatory. It is quite highly inclined for asteroids in the asteroid belt, with an inclination of 35.4 degrees. This may be related to its 2:1 resonance with Jupiter.
In May 2002, a rotational lightcurve of Zulu was obtained from photometric observations by American astronomer Robert Stephens at the Santana Observatory in California. Lightcurve analysis gave a well-defined rotation period of 18.64 hours with a brightness variation of 0.11 magnitude (U=3). One month later, French amateur astronomers René Roy and Laurent Brunetto obtained another lightcurve with a concurring period of 18.65 hours and an amplitude of 0.09 magnitude (U=1).
...
Wikipedia