161 ATHOR

161 Athor
	A three-dimensional model of 161 Athor based on its light curve.
Discovery
Discovered by	James Craig Watson
Discovery site	Detroit Observatory
Discovery date	19 April 1876
Designations
MPC designation	(161) Athor
Pronunciation	/ˈæθər/, /ˈɑːθər/
Named after	Hathor
Alternative designations	A876 HA; 1899 TA;; 1961 PF; 1973 YN4
Minor planet category	Main belt
Orbital characteristics
	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; Mean diameter; 47.0±0.2 km; circular fit
Synodic rotation period	7.280 h (0.3033 d); 7.281 ± 0.001 hours; 7.288 ± 0.007 hours
Geometric albedo	0.1980±0.033
Spectral type	M
Absolute magnitude (H)	9.15

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]

References

^ ^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.
^ Delbo, Marco; et al. (April 2019), "Ancient and primordial collisional families as the main sources of X-type asteroids of the inner main belt", Astronomy & Astrophysics, 624: 21, arXiv: 1902.01633, Bibcode: 2019A&A...624A..69D, doi: 10.1051/0004-6361/201834745, A69.
^ Pilcher, Frederick (July 2011), "Rotation Period Determinations for 28 Bellona, 81 Terpsichore, 126 Velleda 150 Nuwa, 161 Athor, 419 Aurelia, and 632 Pyrrha", The Minor Planet Bulletin, 38 (3): 156−158, Bibcode: 2011MPBu...38..156P.
^ Busarev, V. V.; Taran, M. N. (November 2002), "On the spectral similarity of carbonaceous chondrites and some hydrated and oxidized asteroids", Proceedings of Asteroids, Comets, Meteors - ACM 2002. International Conference, 29 July - 2 August 2002, Berlin, Germany. Ed. Barbara Warmbein. ESA SP-500., Noordwijk, Netherlands: ESA Publications Division, pp. 933−936, Bibcode: 2002ESASP.500..933B, ISBN 92-9092-810-7.

External links

161 Athor at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
161 Athor at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

This article about an asteroid native to the asteroid belt is a stub. You can help Wikipedia by expanding it.

[MPC-1] "Discovery Circumstances: Numbered Minor Planets (1)-(5000)". IAU: Minor Planet Center. Archived from the original on 2 February 2009. Retrieved 20 December 2008.

[2] Noah Webster (1884) A Practical Dictionary of the English Language

[3] "Hathor, Athor". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)

[jpldata-4] ^ ^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.

[5] "(161) Athor". AstDyS. Italy: University of Pisa. Retrieved 20 December 2008.

[SIMPS-6] 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.

[Dunham-7] Dunham & Herald (2008). "Asteroid Occultations". EAR-A-3-RDR-OCCULTATIONS-V6.0. Planetary Data System. Retrieved 27 December 2008.

[8] Pilcher & Higgins (2008). "Period Determination for 161 Athor". The Minor Planet Bulletin. 35 (4): 147. Bibcode: 2008MPBu...35..147P.

[9] 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-10] 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-11] 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.

[Delbo2019-12] Delbo, Marco; et al. (April 2019), "Ancient and primordial collisional families as the main sources of X-type asteroids of the inner main belt", Astronomy & Astrophysics, 624: 21, arXiv: 1902.01633, Bibcode: 2019A&A...624A..69D, doi: 10.1051/0004-6361/201834745, A69.

[Pilcher2011-13] Pilcher, Frederick (July 2011), "Rotation Period Determinations for 28 Bellona, 81 Terpsichore, 126 Velleda 150 Nuwa, 161 Athor, 419 Aurelia, and 632 Pyrrha", The Minor Planet Bulletin, 38 (3): 156−158, Bibcode: 2011MPBu...38..156P.

[Busarev2002-14] Busarev, V. V.; Taran, M. N. (November 2002), "On the spectral similarity of carbonaceous chondrites and some hydrated and oxidized asteroids", Proceedings of Asteroids, Comets, Meteors - ACM 2002. International Conference, 29 July - 2 August 2002, Berlin, Germany. Ed. Barbara Warmbein. ESA SP-500., Noordwijk, Netherlands: ESA Publications Division, pp. 933−936, Bibcode: 2002ESASP.500..933B, ISBN 92-9092-810-7.

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