1951 Lick

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1951 Lick
Discovery [1]
Discovered by C. A. Wirtanen
Discovery site Lick Obs.
Discovery date 26 July 1949
MPC designation (1951) Lick
Named after
James Lick (philanthropist)[2]
1949 OA
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 67.12 yr (24,514 days)
Aphelion 1.4760 AU
Perihelion 1.3049 AU
1.3904 AU
Eccentricity 0.0616
1.64 yr (599 days)
0° 36m 3.96s / day
Inclination 39.091°
Earth MOID 0.3068 AU · 119.5 LD
Physical characteristics
Dimensions 5.57±0.5 km (IRAS:3)[5]
5.59 km (derived)[4]
4.424±0.006 h[6]
5.2974±0.0004 h[7]
5.3008±0.0024 h[a]
5.3016±0.0020 h[b]
5.317±0.001 h[8]
0.0895±0.020 (IRAS:3)[5]
0.1028 (derived)[4]
SMASS = A[1] · A[4][6]
14.20±0.2[b] · 14.2[1] · 14.35±0.2[9] · 14.35[4] · 14.5±0.2[6] · 14.51[5]

1951 Lick, provisional designation 1949 OA, is a rare-type asteroid and Mars-crosser, approximately 5.6 kilometers in diameter. It was discovered on 26 July 1949, by American astronomer Carl Wirtanen at Lick Observatory on the summit of Mount Hamilton, California, and named for American philanthropist James Lick.[2][3]


The asteroid orbits the Sun at a distance of 1.3–1.5 AU once every 20 months (599 days). Its orbit has an eccentricity of 0.06 and an inclination of 39° with respect to the ecliptic.[1] Lick's observation arc begins with its discovery observation, as no precoveries were taken, and no prior identifications were made.[3]

Physical characteristics[edit]

Spectral type[edit]

In the SMASS taxonomic scheme, Lick's spectral type is that of a rare A-type asteroid with a surface consisting of almost pure olivine.[10] As of 2016, only 17 minor planets of this type are known.[11]

Rotation period[edit]

In July 2008, a rotational lightcurve was obtained from photometric by astronomer Brian D. Warner at his Palmer Divide Observatory in Colorado, United States. It gave a well-defined rotation period of 5.2974 hours with a brightness variation of 0.25 in magnitude (U=3).[7] Several lightcurves with a lower or unassessed quality have been obtained by astronomers Wiesław Z. Wiśniewski and Petr Pravec in the 1980s and 1990s.[6][a][b] The most recent observation by Michael Lucas in February 2011, gave a period of 5.317 hours with an amplitude of 0.33 magnitude (U=2).[8]

Diameter and albedo[edit]

According to 3 observations taken by the Infrared Astronomical Satellite IRAS, Lick measures 5.57 kilometers in diameter and its surface has an albedo of 0.09.[5] The Collaborative Asteroid Lightcurve Link agrees with the results obtained by IRAS and derives an albedo of 0.10 and a diameter of 5.59 kilometers with an absolute magnitude of 14.35.[4]


Lick was named in honor of James Lick (1796–1876), American philanthropist and the founder of the discovering Lick Observatory of the University of California. He is also honored by a lunar crater Lick.[2] The approved naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 3938).[12]


  1. ^ a b Summary figures for (1951) Lick: rotation period 5.3008±0.0024 hours (Pravec-1998web) at Light Curve Database
  2. ^ a b c Summary figures for(1951) Lick: rotation period 5.3016 hours (Pravec-1997web) at Light Curve Database


  1. ^ a b c d e f "JPL Small-Body Database Browser: 1951 Lick (1949 OA)" (2016-09-10 last obs.). Jet Propulsion Laboratory. Retrieved 2 July 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1951) Lick. Springer Berlin Heidelberg. pp. 156–157. ISBN 978-3-540-00238-3. Retrieved 9 December 2016. 
  3. ^ a b c "1951 Lick (1949 OA)". Minor Planet Center. Retrieved 9 December 2016. 
  4. ^ a b c d e f "LCDB Data for (1951) Lick". Asteroid Lightcurve Database (LCDB). Retrieved 9 December 2016. 
  5. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 9 December 2016. 
  6. ^ a b c d Wisniewski, W. Z.; Michalowski, T. M.; Harris, A. W.; McMillan, R. S. (March 1995). "Photoelectric Observations of 125 Asteroids". Abstracts of the Lunar and Planetary Science Conference. Bibcode:1995LPI....26.1511W. Retrieved 9 December 2016. 
  7. ^ a b Warner, Brian D. (January 2009). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2008 May - September". The Minor Planet Bulletin. 36 (1): 7–13. Bibcode:2009MPBu...36....7W. ISSN 1052-8091. Retrieved 9 December 2016. 
  8. ^ a b Lucas, Michael P.; Ryan, Jeffrey G.; Fauerbach, Michael; Grasso, Salvatore (October 2011). "Lightcurve Analysis of Five Taxonomic A-class Asteroids". The Minor Planet Bulletin. 38 (4): 218–220. Bibcode:2011MPBu...38..218L. ISSN 1052-8091. Retrieved 9 December 2016. 
  9. ^ 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 9 December 2016. 
  10. ^ de León, J.; Duffard, R.; Licandro, J.; Lazzaro, D. (July 2004). "Mineralogical characterization of A-type asteroid (1951) Lick" (PDF). Astronomy and Astrophysics: L59–L62. Bibcode:2004A&A...422L..59D. doi:10.1051/0004-6361:20048009. Retrieved 9 December 2016. 
  11. ^ "JPL Small-Body Database Search Engine: spec. type = A (SMASSII)". JPL Solar System Dynamics. Retrieved 7 November 2015. 
  12. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 9 December 2016. 

External links[edit]