Global Information161 Athor information
 A three-dimensional model of 161 Athor based on its light curve. | |
| Discovery[1] | |
|---|---|
| Discovered by | James Craig Watson |
| Discovery site | Detroit Observatory |
| Discovery date | 19 April 1876 |
| Designations | |
MPC designation | (161) Athor |
| Pronunciation | /ˈæθər/,[2] /ˈɑːθər/[3] |
Named after | Hathor |
Alternative designations | A876 HA; 1899 TA; 1961 PF; 1973 YN4 |
Minor planet category | Main belt[4] |
| Orbital characteristics[4][5] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 116.50 yr (42551 d) |
| Aphelion | 2.70593 AU (404.801 Gm) |
| Perihelion | 2.05285 AU (307.102 Gm) |
Semi-major axis | 2.37939 AU (355.952 Gm) |
| Eccentricity | 0.137237 |
Orbital period (sidereal) | 3.67 yr (1340.6 d) |
Mean anomaly | 348.807° |
Mean motion | 0° 16m 6.737s / day |
| Inclination | 9.05986° |
Longitude of ascending node | 18.6090° |
Time of perihelion | 2024-Jan-13 |
Argument of perihelion | 295.007° |
| Physical characteristics | |
| Dimensions | 44.19±3.3 km[4] Mean diameter[6] 47.0±0.2 km circular fit[7] |
Synodic rotation period | 7.280 h (0.3033 d)[4] 7.281 ± 0.001 hours[8] 7.288 ± 0.007 hours[9] |
Geometric albedo | 0.1980±0.033[4][6] |
Spectral type | M[10] |
Absolute magnitude (H) | 9.15[4][11] |
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. It is the namesake of a proposed Athor asteroid family, estimated to be ~3 billion years old.[12]
Photometric observations of the minor planet in 2010 gave a rotation period of 7.2798±0.0001 h with an amplitude of 0.19±0.02 in magnitude. This result is consistent with previous determinations.[13] An occultation by Athor was observed, on October 15, 2002, showing an estimated diameter of 47.0 kilometres (29.2 mi).[7] The spectra is similar to that of carbonaceous chondrites, with characteristics of ferric oxides and little or no hydrated minerals.[14]
- ^ a b "Discovery Circumstances: Numbered Minor Planets (1)-(5000)". IAU: Minor Planet Center. Archived from the original on 2 February 2009. Retrieved 20 December 2008.
- ^ Noah Webster (1884) A Practical Dictionary of the English Language
- ^ "Hathor, Athor". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- ^ a b c d e f "161 Athor". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Archived from the original on 20 August 2020. Retrieved 12 May 2016.
- ^ "(161) Athor". AstDyS. Italy: University of Pisa. Retrieved 20 December 2008.
- ^ 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 August 17, 2009. Retrieved December 27, 2008.
- ^ a b Dunham & Herald (2008). "Asteroid Occultations". EAR-A-3-RDR-OCCULTATIONS-V6.0. Planetary Data System. Retrieved 27 December 2008.
- ^ Pilcher & Higgins (2008). "Period Determination for 161 Athor". The Minor Planet Bulletin. 35 (4): 147. Bibcode:2008MPBu...35..147P.
- ^ Debehogne & 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.
- ^ Neese (2005). "Asteroid Taxonomy". EAR-A-5-DDR-TAXONOMY-V5.0. Planetary Data System. Archived from the original on August 5, 2009. Retrieved December 27, 2008.
- ^ Tholen (2007). "Asteroid Absolute Magnitudes". EAR-A-5-DDR-ASTERMAG-V11.0. Planetary Data System. Archived from the original on August 16, 2009. Retrieved December 27, 2008.
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