11441 Anadiego

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11441 Anadiego
Discovery [1]
Discovered by M. R. Cesco
Discovery site El Leoncito Complex
Discovery date 31 December 1975
MPC designation (11441) Anadiego
Named after
Ana Teresa Diego
(political activist)[2]
1975 YD · 1989 GA2
main-belt · (middle)
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)
0° 14m 25.08s / day
Inclination 12.286°
Physical characteristics
Dimensions 6.833 km[3][4]
7.26±1.03 km[5]
8.18 km (calculated)[6]
3.179±0.001 h[7]
0.20 (assumed)[6]
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]

Orbit and classification[edit]

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]

Physical characteristics[edit]

Anadiego has been characterized as a common S-type asteroid by Pan-STARRS photometric survey.[8]

Rotation period[edit]

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 period of 3.179±0.001 hours with a brightness variation of 0.11 magnitude (U=2).[7]

Diameter and albedo[edit]

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]


  1. ^ a b c d "JPL Small-Body Database Browser: 11441 Anadiego (1975 YD)" (2017-03-30 last obs.). Jet Propulsion Laboratory. Retrieved 23 June 2017. 
  2. ^ a b c d e "11441 Anadiego (1975 YD)". Minor Planet Center. Retrieved 7 September 2016. 
  3. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 7 September 2016. 
  4. ^ a b Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096Freely accessible. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 4 December 2016. 
  5. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 7 September 2016. 
  6. ^ a b c d e "LCDB Data for (11441) Anadiego". Asteroid Lightcurve Database (LCDB). Retrieved 7 September 2016. 
  7. ^ a b Hills, Kevin (January 2014). "Asteroid Lightcurve Analysis at Riverland Dingo Observatory (RDO): 2013 Results". The Minor Planet Bulletin. 41 (1): 2–3. Bibcode:2014MPBu...41....2H. ISSN 1052-8091. Retrieved 7 September 2016. 
  8. ^ a b c Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 7 September 2016. 
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 7 September 2016. 

External links[edit]