2830 Greenwich

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2830 Greenwich
Discovery [1]
Discovered by E. Bowell
Discovery site Anderson Mesa Stn.
Discovery date 14 April 1980
MPC designation 2830 Greenwich
Named after
Royal Greenwich Observatory
(historical observatory)[2]
1980 GA · 1969 KC
1978 VZ14
main-belt · Phocaea[3]
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 46.85 yr (17,113 days)
Aphelion 2.8672 AU
Perihelion 1.8899 AU
2.3785 AU
Eccentricity 0.2054
3.67 yr (1,340 days)
0° 16m 7.32s / day
Inclination 25.3513°
Physical characteristics
Dimensions 9.197±0.064 km[4]
9.25 km (taken)[3]
9.252 km[5]
9.50±0.43 km[6]
24 h[7]
B–V = 0.867[1]
U–B = 0.441[1]
Tholen = S[1] · S[3]

2830 Greenwich, provisional designation 1980 GA, is a stony Phocaea asteroid from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered by American astronomer Edward Bowell at Lowell's U.S. Anderson Mesa Station, Arizona, on 14 April 1980.[10]

The stony S-type asteroid is a member of the Phocaea family, a group of asteroids with similar orbital characteristics. It orbits the Sun at a distance of 1.9–2.9 AU once every 3 years and 8 months (1,340 days). Its orbit has an eccentricity of 0.21 and an inclination of 25° with respect to the ecliptic.[1] The first precovery was obtained at Crimea-Nauchnij in 1969, extending the asteroid's observation arc by 11 years prior to its discovery.[10]

In 2002, a photometric light-curve analysis by French amateur astronomer Christophe Demeautis gave an ambiguous rotation period of 24 hours with a brightness amplitude of 0.5 in magnitude (U=2).[7] According to the surveys carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures between 9.2 and 9.5 kilometers in diameter, and its surface has an albedo between 0.17 and 0.19.[4][5][6] The Collaborative Asteroid Lightcurve Link selects 9.3 kilometer as the best diameter estimate.[3]

The minor planet is named for the Royal Greenwich Observatory, home of the Astronomer Royal and located in the London borough of Greenwich, England. The naming took place on the occasion of the centennial of its adoption as "the Greenwich prime meridian for longitude and time". Originally founded for naval purposes in 1675, the Royal Observatory quickly became a leading institution in astronomy. In 1884, the prime meridian finally became a worldwide standard.[2] Naming citation was published on 15 May 1984 (M.P.C. 8801).[11]

See also[edit]

  • 14141 Demeautis, 3-kilometer Flora asteroid named after Christophe Demeautis


  1. ^ a b c d e f g "JPL Small-Body Database Browser: 2830 Greenwich (1980 GA)" (2016-03-23 last obs.). Jet Propulsion Laboratory. Retrieved May 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (2830) Greenwich. Springer Berlin Heidelberg. p. 232. ISBN 978-3-540-00238-3. Retrieved March 2016. 
  3. ^ a b c d e "LCDB Data for (2830) Greenwich". Asteroid Lightcurve Database (LCDB). Retrieved May 2016. 
  4. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved May 2016. 
  5. ^ a b c d Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved March 2016. 
  6. ^ a b c d 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. Retrieved May 2016. 
  7. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (2830) Greenwich". Geneva Observatory. Retrieved May 2016. 
  8. ^ 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. Retrieved May 2016. 
  9. ^ Harris, A. W.; Young, J. W. (October 1989). "Asteroid lightcurve observations from 1979-1981". Icarus: 314–364. Bibcode:1989Icar...81..314H. doi:10.1016/0019-1035(89)90056-0. ISSN 0019-1035. Retrieved March 2016. 
  10. ^ a b "2830 Greenwich (1980 GA)". Minor Planet Center. Retrieved March 2016. 
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved May 2016. 

External links[edit]