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]
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. http://www.cfa.harvard.edu/iau/lists/NumberedMPs000001.html. Retrieved December 20, 2008. 
  2. ^ "161 Athor". JPL Small-Body Database. Jet Propulsion Laboratory. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=161+Athor. Retrieved December 27, 2008. 
  3. ^ "(161) Athor". AstDyS. Italy: University of Pisa. http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.0&n=161. 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 2010-01-17. http://www.webcitation.org/5mqp8r4gD. 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 01, 2008. http://wayback.archive.org/web/20080101000000/http%3A//www.psi.edu/pds/resource/occ.html. 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 2010-01-17. http://www.webcitation.org/5mqq3h9Es. 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. http://web.archive.org/web/20080611192847/http%3A//www.psi.edu/pds/resource/astermag.html. Retrieved December 27, 2008. 
160 Una•161 Athor• 162 Laurentia
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