Astronomy:161 Athor
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Short description: Main-belt asteroid
.png) 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 | |
| (161) Athor | |
| Pronunciation | /ˈæθər/,[3] /ˈɑːθər/[4] |
| Named after | Hathor |
| A876 HA; 1899 TA; 1961 PF; 1973 YN4 | |
| Minor planet category | Main belt[2] |
| Orbital characteristics[2][5] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 116.50 yr (42551 d) |
| ||helion}} | 2.70593 astronomical unit|AU (404.801 Gm) |
| ||helion}} | 2.05285 AU (307.102 Gm) |
| 2.37939 AU (355.952 Gm) | |
| Eccentricity | 0.137237 |
| Orbital period | 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° |
| ||helion}} | 2024-Jan-13 |
| 295.007° | |
| Physical characteristics | |
| Dimensions | 44.19±3.3 km[2] Mean diameter[6] 47.0±0.2 km circular fit[7] |
| Rotation period | 7.280 h (0.3033 d)[2] 7.281 ± 0.001 hours[8] 7.288 ± 0.007 hours[9] |
| Geometric albedo | 0.1980±0.033[2][6] |
| M[10] | |
| Absolute magnitude (H) | 9.15[2][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]
References
- ↑ 1.0 1.1 "Discovery Circumstances: Numbered Minor Planets (1)-(5000)". IAU: Minor Planet Center. Archived from the original on February 2, 2009. https://web.archive.org/web/20090202185140/http://www.cfa.harvard.edu/iau/lists/NumberedMPs000001.html. Retrieved December 20, 2008.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 "161 Athor". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=161.
- ↑ Noah Webster (1884) A Practical Dictionary of the English Language
- ↑ Hathor, Athor (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=Hathor%2C+Athor (Subscription or UK public library membership required.)
- ↑ "(161) Athor". AstDyS. Italy: University of Pisa. https://newton.spacedys.com/astdys/index.php?pc=1.1.0&n=161. Retrieved December 20, 2008.
- ↑ 6.0 6.1 Tedesco (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. https://web.archive.org/web/20090817051318/http://www.psi.edu/pds/resource/imps.html. Retrieved December 27, 2008.
- ↑ 7.0 7.1 Dunham; Herald (2008). "Asteroid Occultations". EAR-A-3-RDR-OCCULTATIONS-V6.0. Planetary Data System. http://www.psi.edu/pds/resource/occ.html. Retrieved December 27, 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. https://web.archive.org/web/20090805185511/http://www.psi.edu/pds/resource/taxonomy.html. 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. https://web.archive.org/web/20090816200758/http://www.psi.edu/pds/resource/astermag.html. 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, doi:10.1051/0004-6361/201834745, A69, Bibcode: 2019A&A...624A..69D.
- ↑ 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, ISBN 92-9092-810-7, Bibcode: 2002ESASP.500..933B.
External links
- 161 Athor at AstDyS-2, Asteroids—Dynamic Site
- 161 Athor at the JPL Small-Body Database
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