161 Athor

      161 Athor
      Discovery[1]
      Discovered by James Craig Watson
      Discovery site Detroit Observatory
      Discovery date April 19, 1876
      Designations
      MPC designation 161
      Named after Hathor
      Minor planet category Main belt[2]
      Orbital characteristics[3]
      Epoch November 30, 2008
      Ap 2.7075 AU
      Peri 2.0507 AU
      Semi-major axis 2.3791 AU
      Eccentricity 0.138031
      Orbital period 1340.35 days (3.67 years)
      Mean anomaly 317.519°
      Inclination 9.054°
      Longitude of ascending node 18.766°
      Argument of peri 294.4°
      Physical characteristics
      Dimensions 44.19 kilometres (27.46 mi) ± 3.3 kilometres (2.1 mi)
      Mean diameter[4]
      47.0 kilometres (29.2 mi) ± 0.2 kilometres (0.12 mi)
      circular fit[5]
      Rotation period

      7.281 ± 0.001 hours[6]

      7.288 ± 0.007 hours[7]
      Albedo 0.198 ± 0.033[4]
      Spectral type M[8]
      Absolute magnitude (H) 9.15[9]

      161 Athor is an M-type Main belt asteroid that was discovered by James Craig Watson on April 19, 1876 at the Detroit Observatory[1] and named after Hathor, an Egyptian fertility goddess. An occultation by Athor was observed, on October 15, 2002 resulting in an estimated diameter of 47.0 kilometres (29.2 mi).[5]

      References

      1. ^ a b "Discovery Circumstances: Numbered Minor Planets (1)-(5000)". IAU: Minor Planet Center. Archived from the original on February 2, 2009. Retrieved December 20, 2008. 
      2. ^ "161 Athor". JPL Small-Body Database. Jet Propulsion Laboratory. Retrieved December 27, 2008. 
      3. ^ "(161) Athor". AstDyS. Italy: University of Pisa. Retrieved December 20, 2008. 
      4. ^ a b Tedesco et al. (2004). "Supplemental IRAS Minor Planet Survey (SIMPS)". IRAS-A-FPA-3-RDR-IMPS-V6.0. Planetary Data System. Archived from the original on January 17, 2010. Retrieved December 27, 2008. 
      5. ^ a b Dunham and Herald (2008). "Asteroid Occultations". EAR-A-3-RDR-OCCULTATIONS-V6.0. Planetary Data System. Archived from the original on January 1, 2008. Retrieved December 27, 2008. 
      6. ^ Pilcher and Higgins (2008). "Period Determination for 161 Athor". The Minor Planet Bulletin 35 (4): 147. Bibcode:2008MPBu...35..147P. 
      7. ^ Debehogne and Zappala (1980). "Photoelectric lightcurves of the asteroids 139 Juewa and 161 Athor, obtained with the 50 CM photometric telescope at ESO, La Silla". Astronomy and Astrophysics Supplement Series 42: 85–89. Bibcode:1980A&AS...42...85D. 
      8. ^ Neese (2005). "Asteroid Taxonomy". EAR-A-5-DDR-TAXONOMY-V5.0. Planetary Data System. Archived from the original on January 17, 2010. Retrieved December 27, 2008. 
      9. ^ Tholen (2007). "Asteroid Absolute Magnitudes". EAR-A-5-DDR-ASTERMAG-V11.0. Planetary Data System. Archived from the original on June 11, 2008. Retrieved December 27, 2008. 
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      Last modified on 13 March 2013, at 09:30