5751 Zao
| Discovery[1] | |
|---|---|
| Discovered by | M. Koishikawa |
| Discovery site | Ayashi Station |
| Discovery date | January 5, 1992 |
| Designations | |
| MPC designation | 1992 AC |
|
Named after
|
Mount Zaō |
| MPO 319156, 1989 EN1 | |
Amor  NEO |
|
| Orbital characteristics[2] | |
| Epoch May 14, 2008 | |
| Aphelion | 2.993785803 ± 2.114e-08 AU |
| Perihelion | 1.21607607 ± 1.6591e-07 AU |
| 2.104930938 ± 1.4863e-08 AU | |
| Eccentricity | .422272697 ± 7.6573e-08 |
| 1115.463089 ± 1.1815e-05 d | |
| 115.323764 ± 2.5873e-05° | |
| Inclination | 16.0689199 ± 8.3868e-06° |
| 121.723507 ± 1.6679e-05° | |
| 25.210457 ± 2.605e-05° | |
| Physical characteristics | |
| Dimensions | 2.3 km[3] |
| 76 hr[3] | |
| 0.36[3] | |
| 14.8 | |
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5751 Zao also designated 1992 AC is an Amor asteroid discovered on January 5, 1992 by M. Koishikawa at the Ayashi Station of the Sendai Astronomical Observatory.
Physical properties
5751 Zao has been observed by several groups to determine its rotational period. Its light curve was observed by Pravec, et al. between 1992 and 1995 with the intention of determining its rotational period. From its nearly constant brightness it was determined that the asteroid is roughly spherical and has a rotational period of ≥ 21.7 hr.[4] Another group led by Wisniewski conducted an approximately 5 hour observation and were unable to conclude a rotational period.[5] 5751 Zao was again observed in 2001 by Delbó, et al. using the Keck telescope. They were able to determine the asteroid's albedo of 0.36 and re-classify the asteroid from X-type to E-type.[6] Using the asteroid's albedo and the Near Earth Asteroid Thermal Model (NEATM) the asteroid's diameter was estimated to be 2.3 km.[6] Further study of the asteroid by the Ondrejov Asteroid Photometry Project concludes that a rotational period of 76 hours is consistent with earlier measurements.[3][7]
External links
- IAUC 5426 - Initial discovery
- IAUC 5442 - Refined orbital elements
- IAUC 5474 - Extension to ephemeris
- 5751 at the JPL Small-Body Database
References
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