2903 Zhuhai

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]

2903 Zhuhai
Discovery [1]
Discovered byPurple Mountain Obs.
Discovery sitePurple Mountain Obs.
Discovery date23 October 1981
(2903) Zhuhai
Named after
Zhuhai[1] (Chinese city)
1981 UV9 · 1955 MC
1973 UK4 · 1975 GC
1977 TN7 · 1977 VL2
main-belt[1][2] · (middle)
background[3] · Maria[4][5]
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc62.44 yr (22,808 d)
Aphelion2.7128 AU
Perihelion2.4104 AU
2.5616 AU
4.10 yr (1,497 d)
0° 14m 25.44s / day
Physical characteristics
Mean diameter
13.58±0.90 km[6]
13.581±0.896 km[6]
14.01±0.86 km[7]
5.263±0.002 h[8]
5.268±0.003 h[9]
6.152 h[4]
0.20 (assumed)[10]

Orbit and classificationEdit

Based on osculating Keplerian orbital elements, Zhuhai has also been classified as a member of the Maria family (506), a large family of stony asteroids, named after 170 Maria.[4] When applying the hierarchical clustering method to its proper orbital elements, the asteroid is both a non-family asteroid of the main belt's background population (according to Nesvorný),[3] as well as a core member of the Maria family (according to Milani and Knežević).[5]

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 MC at Goethe Link Observatory in June 1955, or 26 years prior to its official discovery observation at Nanking.[1]

Physical characteristicsEdit

Zhuhai has been characterized as a common, stony S-type asteroid by Pan-STARRS photometric survey.[10][11]

Rotation periodEdit

Until 2012, three rotational lightcurves of Zhuhai have been obtained from photometric observations.[8][9][4] Best-rated lightcurve from the Oakley Southern Sky Observatory gave a well-defined rotation period of 5.263 hours with a brightness amplitude of 0.32 magnitude (U=3).[8][10]

Diameter and albedoEdit

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]


This minor planet was named after the city of located in the Guangdong province of southern China.[1] The official naming citation was published by the Minor Planet Center on 11 March 1990 (M.P.C. 16041).[12]


  1. ^ a b c d e f g "2903 Zhuhai (1981 UV9)". Minor Planet Center. Retrieved 27 April 2018.
  2. ^ a b c d "JPL Small-Body Database Browser: 2903 Zhuhai (1981 UV9)" (2017-11-25 last obs.). Jet Propulsion Laboratory. Retrieved 27 April 2018.
  3. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Archived from the original on 2 August 2017. Retrieved 27 April 2018.
  4. ^ a b c d Alvarez-Candal, Alvaro; Duffard, René; Angeli, Cláudia A.; Lazzaro, Daniela; Fernández, Silvia (December 2004). "Rotational lightcurves of asteroids belonging to families". Icarus. 172 (2): 388–401. Bibcode:2004Icar..172..388A. doi:10.1016/j.icarus.2004.06.008.
  5. ^ a b "Asteroid 2903 Zhuhai – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
  6. ^ a b c d e Masiero, 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.
  7. ^ a b c d Usui, 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. Retrieved 27 April 2018. Online catalog
  8. ^ a b c Moravec, 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. ISSN 1052-8091.
  9. ^ a b Li, 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. ISSN 1052-8091.
  10. ^ a b c d e f g "LCDB Data for (2903) Zhuhai". Asteroid Lightcurve Database (LCDB). Retrieved 27 April 2018.
  11. ^ a b c Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007.
  12. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 27 April 2018.

External linksEdit