| Discovery | |
|---|---|
| Discovered by | D. Stewart |
| Discovery date | 14 August 1901 |
| Designations | |
| MPC designation | (475) Ocllo |
| Pronunciation | /ˈɒkloʊ/ |
| Named after | Mama Uqllu, legendary first queen of the Kingdom of Cuzco |
| Alternative designations | 1901 HN; 1959 JS; 1979 DD |
| Minor planet category | Mars-crosser |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 97.47 yr (35601 d) |
| Aphelion | 3.5821 AU (535.87 Gm) |
| Perihelion | 1.60661 AU (240.345 Gm) |
| Semi-major axis | 2.59436 AU (388.111 Gm) |
| Eccentricity | 0.38073 |
| Orbital period (sidereal) | 4.18 yr (1526.3 d) |
| Mean anomaly | 174.037° |
| Mean motion | 0° 14 9.096 / day |
| Inclination | 18.926° |
| Longitude of ascending node | 34.496° |
| Argument of perihelion | 305.68° |
| Earth MOID | 0.670978 AU (100.3769 Gm) |
| Mars MOID | 0.3173 AU (47.47 Gm) |
| Physical characteristics | |
| Dimensions | 11–25 km |
| Mass | 3.1×10? kg |
| Mean density | 2.0? g/cm |
| Synodic rotation period | 7.3151 h (0.30480 d) |
| Spectral type | X |
| Absolute magnitude (H) | 11.88 |
475 Ocllo is a large Mars-crossing asteroid. It was discovered by American astronomer DeLisle Stewart on August 14, 1901 and was assigned a provisional name of 1901 HN.
Photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces, New Mexico during 2010 gave a light curve with a period of 7.3151 ± 0.0002 hours and a brightness variation of 0.66 ± 0.04 in magnitude.
References
- "The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
- ^ "JPL Small-Body Database Browser: 475 Ocllo (1901 HN)". Jet Propulsion Laboratory. Retrieved 9 May 2016.
- "Absolute Magnitude (H)". NASA/JPL. Archived from the original on 2 March 2001. Retrieved 14 June 2015.
- ^ Pilcher, Frederick (April 2011), "Rotation Period Determinations for 25 Phocaea, 140 Siwa, 149 Medusa 186 Celuta, 475 Ocllo, 574 Reginhild, and 603 Timandra", The Minor Planet Bulletin, 38 (2): 76–78, Bibcode:2011MPBu...38...76P.
- Pickering, Edward C. (1905). "Positions of (475) Ocllo during 1904". Astronomische Nachrichten. 169 (8–9): 139–142. Bibcode:1905AN....169..139P. doi:10.1002/asna.19051690806. ISSN 0004-6337.
- Kreutz, H. (1904). "Planet (475) Ocllo". Astronomische Nachrichten. 167 (21): 349–350. doi:10.1002/asna.19041672106. ISSN 0004-6337.
External links
- 475 Ocllo at AstDyS-2, Asteroids—Dynamic Site
- 475 Ocllo at the JPL Small-Body Database
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