1919 Clemence

1919 Clemence

Discovery
Discovered by	J. Gibson C. U. Cesco
Discovery site	El Leoncito
Discovery date	16 September 1971
Designations
MPC designation	1919 Clemence
Named after	Gerald Clemence
Alternative names	1971 SA · 1970 EA1 1971 QZ
Minor planet category	main-belt (inner)
Orbital characteristics
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
Semi-major axis	1.9358 AU
Eccentricity	0.0947
Orbital period	2.69 yr (983.78 days)
Mean anomaly	353.53°
Inclination	19.336°
Longitude of ascending node	356.99°
Argument of perihelion	100.07°
Earth MOID	0.8497 AU
Physical characteristics
Rotation period	67.4 h
Spectral type	B–V = 0.750 U–B = 0.254 Tholen = X
Absolute magnitude (H)	13.45

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.

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.

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.

External links

1919 Clemence at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters