1806 Derice

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
1806 Derice
Discovery [1]
Discovery site Perth Obs. (Bickley)
Discovery date 13 June 1971
MPC designation (1806) Derice
Named after
Derice Harwood
(wife of astronomer)[2]
1971 LC · 1927 EB
1942 TD · 1949 YD
1967 EB
main-belt · Flora[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 67.44 yr (24,634 days)
Aphelion 2.4750 AU
Perihelion 1.9990 AU
2.2370 AU
Eccentricity 0.1064
3.35 yr (1,222 days)
0° 17m 40.56s / day
Inclination 3.8406°
Physical characteristics
Dimensions 7.976±0.759[4]
10.14±0.41 km[5]
10.697±0.061 km[6]
10.7 km (derived)[7]
3.22352±0.00004 h[a]
3.2236±0.0005 h[a]
3.2237±0.0001 h[a]
3.2240±0.0005 h[8]
3.4602±0.0007 h[9]
11.65±0.06 (R)[a] · 12.00[5][6] · 12.1[1] · 12.14±0.078[3][7]

1806 Derice, provisional designation 1971 LC, is a stony Flora asteroid from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. Discovered on 13 June 1971, at the Bickley site of the Perth Observatory in Western Australia, it was the first discovery of a minor planet ever made in Oceania. The asteroid was named after the wife of Dennis Harwood, staff member at Bickley.[2][10]

Classification and orbit[edit]

The S-type asteroid is a member of the Flora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,222 days). Its orbit has an eccentricity of 0.11 and an inclination of 4° with respect to the ecliptic.[1] The first used precovery was taken at Palomar Observatory in 1949, extending the asteroid's observation arc by 22 years prior to its official discovery at Bickley. The first unused observation dates back to 1927, at Tokyo Observatory.[10]

Physical characteristics[edit]


A large number of rotational lightcurves for this asteroid were obtained from several photometric observations. The first observations were made by Italian astronomer Silvano Casulli in November 2006, and gave a rotation period 3.4602±0.0007 hours with a brightness amplitude of 0.19 in magnitude (U=3).[9]

One month later, in December 2006, observations at the Carbuncle Hill Observatory gave a period of 3.2240±0.0005 hours with an identical amplitude of 0.19 in magnitude (U=3).[8]

Between November 2009 and December 2012, Czech astronomer Petr Pravec at Ondřejov Observatory obtained three more lightcurves with periods between 3.2235 and 3.2237 hours and corresponding amplitudes of 0.07. 0.10 and 0.10, respectively (U=3/3/3).[a]

Diameter and albedo[edit]

According to the space-based surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures between 8.0 and 10.7 kilometers in diameter, respectively, and its surface has a albedo between 0.035 and 0.282.[4][5][6] Astronomer Petr Pravec and the Collaborative Asteroid Lightcurve Link derive an albedo of 0.21 and a diameter of 10.7 kilometers with an absolute magnitude of 12.4.[3][7]


This minor planet was named after Derice Harwood, wife of Dennis Harwood, astrometric staff member of the discovering Perth Observatory.[2] The official naming citation was published by the Minor Planet Center on 11 December 1981 (M.P.C. 6530).[11]


  1. ^ a b c d e Pravec, P.; Wolf, M.; Sarounova, L. (2009, 2011 and 2012) web publication. Summary figures listed at the Light Curve Data Base-(1806) Derice


  1. ^ a b c d "JPL Small-Body Database Browser: 1806 Derice (1971 LC)" (2017-05-06 last obs.). Jet Propulsion Laboratory. Retrieved 3 June 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1806) Derice. Springer Berlin Heidelberg. p. 145. ISBN 978-3-540-00238-3. Retrieved 16 May 2016. 
  3. ^ a b c d "LCDB Data for (1806) Derice". Asteroid Lightcurve Database (LCDB). Retrieved 16 May 2016. 
  4. ^ a b c Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 8 December 2016. 
  5. ^ 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 16 May 2016. 
  6. ^ 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 16 May 2016. 
  7. ^ 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 4 November 2015. 
  8. ^ a b Pray, Donald P.; Galad, Adrian; Husarik, Marek; Oey, Julian (March 2008). "Lightcurve Analysis of Fourteen Asteroids". The Minor Planet Bulletin. 35 (1): 34–36. Bibcode:2008MPBu...35...34P. ISSN 1052-8091. Retrieved 4 November 2015. 
  9. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1806) Derice". Geneva Observatory. Retrieved 16 May 2016. 
  10. ^ a b "1806 Derice (1971 LC)". Minor Planet Center. Retrieved 16 May 2016. 
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 16 May 2016. 

External links[edit]