999 Zachia
| Discovery | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg |
| Discovery date | 9 August 1923 |
| Designations | |
| 1923 NW | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 92.68 yr (33850 days) |
| Aphelion | 3.1787 AU (475.53 Gm) |
| Perihelion | 2.0450 AU (305.93 Gm) |
| 2.6118 AU (390.72 Gm) | |
| Eccentricity | 0.21704 |
| 4.22 yr (1541.8 d) | |
| 352.050° | |
| 0° 14m 0.6s / day | |
| Inclination | 9.7603° |
| 214.972° | |
| 128.034° | |
| Earth MOID | 1.054 AU (157.7 Gm) |
| Jupiter MOID | 2.32521 AU (347.846 Gm) |
| Jupiter Tisserand parameter | 3.355 |
| Physical characteristics | |
Mean radius | 8.95 km |
| 22.77 h (0.949 d) | |
| 0.1994±0.051 | |
| 10.8 | |
|
| |
999 Zachia is a main-belt asteroid that was discovered by German astronomer Karl W. Reinmuth in 1923 and named after Hungarian astronomer Franz Xaver von Zach.
Photometric observations of this asteroid collected during 1999 show a rotation period of 22.77 ± 0.03 hours with a brightness variation of 0.3 magnitude.[2]
References
- ↑ "999 Zachia (1923 NW)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 2 May 2016.
- ↑ Warner, B. (March 2000), "Asteroid Photometry at the Palmer Divide Observatory", The Minor Planet Bulletin, 27: 4–6, Bibcode:2000MPBu...27....4W.
External links
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