Discovery [1] | |
---|---|
Discovered by | H. Debehogne |
Discovery site | La Silla Obs. |
Discovery date | 18 September 1982 |
Designations | |
(11474) 1982 SM2 | |
1982 SM2 · 1995 KD | |
main-belt · Baptistina [2] | |
Orbital characteristics [1] | |
Epoch 4 September 2017 ( JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 32.59 yr (11,905 days) |
Aphelion | 2.7224 AU |
Perihelion | 1.8294 AU |
2.2759 AU | |
Eccentricity | 0.1962 |
3.43 yr (1,254 days) | |
76.029 ° | |
0° 17m 13.56s / day | |
Inclination | 5.4069° |
348.59° | |
355.61° | |
Physical characteristics | |
Dimensions | 5.71 km (calculated) [2] |
1917.2214±2716 h [3] | |
0.057 (assumed) [2] | |
C [2] | |
14.493±0.001 (R) [3] · 14.7 [1] · 14.94 [2] · 14.94±0.61 [4] | |
(11474) 1982 SM2 is a carbonaceous Baptistina asteroid and potentially slow rotator from the inner regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 18 September 1982, by Belgian astronomer Henri Debehogne at ESO' La Silla Observatory in northern Chile. [5]
The C-type asteroid belongs to the small Baptistina family. It orbits the Sun at a distance of 1.8–2.7 AU once every 3 years and 5 months (1,254 days). Its orbit has an eccentricity of 0.20 and an inclination of 5 ° with respect to the ecliptic. [1] As no precoveries were taken, and no prior identifications were made, the asteroid's observation arc begins with its official discovery observation. [5]
In September 2013, a rotational lightcurve of this asteroid was obtained from photometric observations in the R-band at the Palomar Transient Factory in California. It gave an exceptionally long rotation period of 1917 hours with a brightness amplitude of 0.04 magnitude ( U=1). [3] However, the fragmentary light-curve has received a low quality rating by the Collaborative Asteroid Lightcurve Link (CALL) which means that the result could be completely wrong (also see potentially slow rotator). [2] [3]
CALL assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 5.71 kilometers, based on an absolute magnitude of 14.49. [2]
This minor planet was numbered by the Minor Planet Center on 28 September 1999. [6] As of 2018, it has not been named. [5]