1510 Charlois, provisional designation 1939 DC, is a carbonaceous Eunomia asteroid from the middle region of the asteroid belt, approximately 24 kilometers in diameter.
Discovery[1] | |
---|---|
Discovered by | A. Patry |
Discovery site | Nice Obs. |
Discovery date | 22 February 1939 |
Designations | |
(1510) Charlois | |
Named after | Auguste Charlois (astronomer)[2] |
1939 DC · 1959 WE 1963 UB | |
main-belt · Eunomia[3] | |
Orbital characteristics[1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 78.10 yr (28,525 days) |
Aphelion | 3.0649 AU |
Perihelion | 2.2791 AU |
2.6720 AU | |
Eccentricity | 0.1470 |
4.37 yr (1,595 days) | |
16.619° | |
0° 13m 32.52s / day | |
Inclination | 11.821° |
331.49° | |
165.25° | |
Physical characteristics | |
Dimensions | 20.30±0.39 km[4] 23.68 km (derived)[3] 23.80±2.8 km (IRAS:11)[5] 24.507±0.345[6] 26.98±0.64 km[7] 27.608±0.373 km[8] |
5.866±0.0003 h[9] 6.653±0.008 h[10] | |
0.0769±0.0086[8] 0.0791 (derived)[3] 0.081±0.004[7] 0.1033±0.029 (IRAS:11)[5] 0.118±0.017[4][6] | |
SMASS = C[1] · C[3][11] | |
11.2[7][8] · 11.40[4] · 11.5[1][3] | |
It was discovered on 22 February 1939, by French astronomer André Patry at Nice Observatory in southeastern France, and later named after astronomer Auguste Charlois.[2][12]
Charlois is a carbonaceous C-type asteroid and a member of the Eunomia family, a large group of otherwise mostly S-type asteroids and the most prominent family in the intermediate main-belt. It orbits the Sun in the central main-belt at a distance of 2.3–3.1 AU once every 4 years and 4 months (1,595 days). Its orbit has an eccentricity of 0.15 and an inclination of 12° with respect to the ecliptic.[1] As no precoveries were taken and no prior identifications were made, the body's observation arc begins with its discovery observation in 1939.[12]
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Charlois measures between 20.3 and 27.6 kilometers in diameter, and its surface has an albedo between 0.077 and 0.12,[4][5][6][7][8] while the Collaborative Asteroid Lightcurve Link derives an albedo of 0.079 and a diameter of 23.7 kilometers based on an absolute magnitude of 11.5.[3]
In November 2007, a rotational lightcurve, constructed from photometric observations by Crag Bennefeld at the Rick Observatory, gave a rotation period of 6.653±0.008 hours with a brightness variation of 0.23 in magnitude (U=2).[10] Another lightcurve, obtained by French astronomers Pierre Antonini and René Roy in February 2013, gave a period of 5.866±0.0003 hours with an amplitude of 0.18 (U=2).[9]
This minor planet was named in memory of French astronomer Auguste Charlois (1864–1910), an early discoverer of minor planets at the Nice Observatory where this asteroid was discovered. He was a pioneer during the transition from visual to photographic discoveries in the late 19th century. Until his homicide in 1910, he had discovered 99 asteroids.[2] The official naming citation was published by the Minor Planet Center on 30 June 1977 (M.P.C. 4190).[13]