999 Zachia

999 Zachia
Discovery
Discovered by	K. Reinmuth
Discovery site	Heidelberg
Discovery date	9 August 1923
Designations
MPC designation	(999) Zachia
Alternative designations	1923 NW
Orbital characteristics
	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)
Semi-major axis	2.6118 AU (390.72 Gm)
Eccentricity	0.21704
Orbital period (sidereal)	4.22 yr (1541.8 d)
Mean anomaly	352.050°
Mean motion	0° 14m 0.6s / day
Inclination	9.7603°
Longitude of ascending node	214.972°
Argument of perihelion	128.034°
Physical characteristics
Mean radius	8.95 km
Synodic rotation period	22.77 h (0.949 d)
Geometric albedo	0.1994±0.051
Absolute magnitude (H)	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)
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
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
999 Zachia at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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[jpldata-1] "999 Zachia (1923 NW)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 2 May 2016.

[MPB27_4-2] Warner, B. (March 2000), "Asteroid Photometry at the Palmer Divide Observatory", The Minor Planet Bulletin, 27: 4–6, Bibcode:2000MPBu...27....4W.

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