|Discovered by||J. Gibson
C. U. Cesco
|Discovery site||El Leoncito|
|Discovery date||16 September 1971|
|MPC designation||1919 Clemence|
|1971 SA · 1970 EA1
|Orbital characteristics |
|Epoch 27 June 2015 (JD 2457200.5)|
|Uncertainty parameter 0|
|Observation arc||43.33 yr (15,826 days)|
|2.69 yr (983.78 days)|
|Earth MOID||0.8497 AU|
|B–V = 0.750
U–B = 0.254
Tholen = X
Photometric measurements of the X-type asteroid made in 2005 at the Palmer Divide Observatory showed a light curve with a period of ±0.1 hours and a brightness variation of 68.5±0.03 in magnitude. Czech astronomer 0.60Petr Pravec from the Ondřejov Observatory believes this may be a tumbling asteroid.
It is named for American astronomer Gerald Maurice Clemence (1908–1974), first scientific director of the United States Naval Observatory and professor of astronomy at the Yale Observatory, known for his work on the theory of the motion of Mars, and other contributions in celestial mechanics, notably on the motion of Mercury and on the system of astronomical constants. He served as president of the American Astronomical Society and of IAU.
- "JPL Small-Body Database Browser: 1919 Clemence (1971 SA)" (2015-01-14 last obs.). Jet Propulsion Laboratory. Retrieved October 2015.
- Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1919) Clemence. Springer Berlin Heidelberg. p. 154. ISBN 978-3-540-29925-7. Retrieved October 2015.
- Warner, Brian D. (2005), "Asteroid lightcurve analysis at the Palmer Divide Observatory - winter 2004-2005", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 32 (3), pp. 54–58, Bibcode:2005MPBu...32...54W.
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