| Discovery | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg |
| Discovery date | 9 August 1923 |
| Designations | |
| (999) Zachia | |
| 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° | |
| 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
- Lightcurve plot of 999 Zachia, Palmer Divide Observatory, B. D. Warner (1999)
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 999 Zachia at AstDyS-2, Asteroids—Dynamic Site
- 999 Zachia at the JPL Small-Body Database
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