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.
| 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 | |
| 8.95 km | |
| 22.77 h (0.949 d) | |
| 0.1994±0.051 | |
| 10.8 | |
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
edit- ^ "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
edit- 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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