| Discovery[1] | |
|---|---|
| Discovered by | M. R. Cesco |
| Discovery site | El Leoncito Complex |
| Discovery date | 31 December 1975 |
| Designations | |
| (11441) Anadiego | |
Named after | Ana Teresa Diego (political activist)[2] |
| 1975 YD · 1989 GA2 | |
| main-belt · (middle) background | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 41.25 yr (15,065 days) |
| Aphelion | 3.2218 AU |
| Perihelion | 1.9025 AU |
| 2.5621 AU | |
| Eccentricity | 0.2575 |
| 4.10 yr (1,498 days) | |
| 93.428° | |
| 0° 14m 25.08s / day | |
| Inclination | 12.286° |
| 217.96° | |
| 205.40° | |
| Physical characteristics | |
| Dimensions | 6.833 km[3][4] 7.26±1.03km[5] 8.18 km(calculated)[6] |
| 3.179±0.001 h[7] | |
| 0.20 (assumed)[6] 0.254±0.129[5] 0.2869±0.0600[3] 0.287±0.060[4] | |
| S[6][8] | |
| 12.44±0.57[8] · 12.8[1][3][5][6] | |
11441 Anadiego, provisional designation 1975 YD, is a stony background asteroid from the central region of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 31 December 1975, by Argentine astronomer Mario R. Cesco at the El Leoncito Complex in western Argentina.[2] It was named in memory of Argentine political activist Ana Diego.[2]
Anadiego orbits the Sun in the central main-belt at a distance of 1.9–3.2 AU once every 4 years and 1 month (1,498 days). Its orbit has an eccentricity of 0.26 and an inclination of 12° with respect to the ecliptic.[1] As no precoveries were taken, the asteroid's observation arc starts with its discovery observation in 1975.[2]
Anadiego has been characterized as a common S-type asteroidbyPan-STARRS photometric survey.[8]
A rotational lightcurve was obtained for this asteroid by astronomer Kevin Hills at the Australian Riverland Dingo Observatory in February 2013. It gave a rotation periodof3.179±0.001 hours with a brightness variation of 0.11 magnitude (U=2).[7]
According to the surveys carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Anadiego measures 6.8 and 7.3 kilometers in diameter and its surface has an albedo of 0.287 and 0.254, respectively.[3][5] The Collaborative Asteroid Lightcurve Link assumes a lower standard albedo for stony asteroids of 0.20, and, correspondingly calculates a larger diameter of 8.2 kilometers with an absolute magnitude of 12.8.[6]
This minor planet was named in memory of Ana Teresa Diego (1954–1976), an astronomy student at La Plata Astronomical Observatory and political activist, who was kidnapped and disappeared in September 1976, by unidentified persons believed working for the military junta then ruling Argentina.[2] The approved naming citation was published by the Minor Planet Center 10 December 2011 (M.P.C. 77501).[9]
