1919 Clemence

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1919 Clemence
Discovery [1]
Discovered by J. Gibson
C. U. Cesco
Discovery site El Leoncito
Discovery date 16 September 1971
MPC designation 1919 Clemence
Named after
Gerald Clemence[2]
1971 SA · 1970 EA1
1971 QZ
main-belt (inner)
Orbital characteristics[1]
Epoch 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc 43.33 yr (15,826 days)
Aphelion 2.1192 AU
Perihelion 1.7523 AU
1.9358 AU
Eccentricity 0.0947
2.69 yr (983.78 days)
Inclination 19.336°
Earth MOID 0.8497 AU
Physical characteristics
67.4 h
B–V = 0.750
U–B = 0.254
Tholen = X

1919 Clemence, provisional designation 1971 SA, is an inner main-belt asteroid discovered on September 16, 1971 by J. Gibson and Carlos Ulrrico Cesco at Leoncito Astronomical Complex, Argentina.[2]

Photometric measurements of the X-type asteroid made in 2005 at the Palmer Divide Observatory showed a light curve with a period of 68.5±0.1 hours and a brightness variation of 0.60±0.03 in magnitude. Czech astronomer Petr Pravec from the Ondřejov Observatory believes this may be a tumbling asteroid.[3]

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.[2]


  1. ^ a b "JPL Small-Body Database Browser: 1919 Clemence (1971 SA)" (2015-01-14 last obs.). Jet Propulsion Laboratory. Retrieved October 2015. 
  2. ^ a b c 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. 
  3. ^ 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. 

External links[edit]

External links[edit]

1919 Clemence at the JPL Small-Body Database