2903 Zhuhai, provisional designation 1981 UV9, is a stony background or Marian asteroid from the central regions of the asteroid belt, approximately 14 kilometers (8.7 miles) in diameter. It was discovered on 23 October 1981, by astronomers at Purple Mountain Observatory near Nanking, China.[1] The S-type asteroid has a rotation period of 5.26 hours.[10] It was named for the Chinese city of Zhuhai.[1]
It orbits the Sun in the central main-belt at a distance of 2.4–2.7 AU once every 4 years and 1 month (1,497 days; semi-major axis of 2.56 AU). Its orbit has an eccentricity of 0.06 and an inclination of 14° with respect to the ecliptic.[2] The body's observation arc begins with its first observation as 1955 MCatGoethe Link Observatory in June 1955, or 26 years prior to its official discovery observation at Nanking.[1]
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Zhuhai measures between 13.58 and 14.01 kilometers in diameter and its surface has an albedo between 0.146 and 0.276.[6][7] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 13.58 kilometers based on an absolute magnitude of 11.7.[10]
^ abcdeMasiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8.
^ abcdUsui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Online catalog
^ abcMoravec, Patricia; Cochren, Joseph; Gerhardt, Michael; Harris, Andrew; Karnemaat, Ryan; Melton, Elizabeth; et al. (October 2012). "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2012 January-April". The Minor Planet Bulletin. 39 (4): 213–216. Bibcode:2012MPBu...39..213M. ISSN1052-8091.
^ abLi, Bin; Zhao, Haibin; Yao, Jingshen (October 2011). "The Lightcurve Analysis of Five Asteroids". The Minor Planet Bulletin. 38 (4): 179–180. Bibcode:2011MPBu...38..179L. ISSN1052-8091.