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 · (inner)[3]
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 39.92 yr (14,580 days)
Aphelion 3.2210 AU
Perihelion 1.9017 AU
2.5613 AU
Eccentricity 0.2575
4.10 yr (1,497 days)
0° 14m 25.44s / day
Inclination 12.285°
Physical characteristics
Dimensions 6.833 km[4]
7.26±1.03 km[5]
8.18 km (calculated)[3]
3.179±0.001 h[6]
0.20 (assumed)[3]

11441 Anadiego, provisional designation 1975 YD, is a stony asteroid from the inner regions 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]

The S-type asteroid orbits the Sun at a distance of 1.9–3.2 AU once every 4 years and 1 month (1,497 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]

A rotational light-curve 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).[6]

According to the surveys carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 6.8 and 7.3 kilometers in diameter and its surface has an albedo of 0.287 and 0.254, respectively.[4][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, based on an absolute magnitude of 12.8.[3]

The 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] Naming citation was published 10 December 2011 (M.P.C. 77501).[8]


  1. ^ a b c d "JPL Small-Body Database Browser: 11441 Anadiego (1975 YD)" (2015-12-01 last obs.). Jet Propulsion Laboratory. Retrieved 7 September 2016. 
  2. ^ a b c d "11441 Anadiego (1975 YD)". Minor Planet Center. Retrieved 7 September 2016. 
  3. ^ a b c d e f "LCDB Data for (11441) Anadiego". Asteroid Lightcurve Database (LCDB). Retrieved 7 September 2016. 
  4. ^ 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:1109.6407free to read. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 7 September 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:1209.5794free to read. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 7 September 2016. 
  6. ^ 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. 
  7. ^ a b 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:1506.00762free to read. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 7 September 2016. 
  8. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 7 September 2016. 

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