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 | |
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Discovered by | K. Reinmuth |
Discovery site | Heidelberg |
Discovery date | 9 August 1923 |
Designations | |
MPC designation | (999) Zachia |
Alternative 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) |
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 |
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]
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