11885 Summanus
| Discovery[1] | |
|---|---|
| Discovered by | Spacewatch |
| Discovery site | Kitt Peak southwest of Tucson, Arizona, USA |
| Discovery date | September 25, 1990 |
| Designations | |
Designation | 1990 SS |
| MPO 196501 | |
Apollo  NEO | |
| Orbital characteristics[2] | |
| Epoch Dec 9, 2014 (JD 2457000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 7504 d 20.54 yr |
| Aphelion | 2.512238865 AU |
| Perihelion | 0.89465514 AU |
| 1.703447004 AU | |
| Eccentricity | 0.47479720 |
| 812.066074 d 2.22 yr | |
Average orbital speed | 21.4743560 km/s |
| 263.405392° | |
| Inclination | 19.41888° |
| 359.891766° | |
| 116.06646° | |
| Earth MOID | 0.0680088 AU |
| Physical characteristics | |
| Dimensions | 530–1200 m[3] |
| 7.358 h[2] | |
| 18.5[2] | |
11885 Summanus (also designated 1990 SS) is an asteroid that is a Near-Earth Object (NEO) and an Apollo asteroid.
Discovery and naming
11885 Summanus was discovered by Spacewatch on September 25, 1990, the first fully automatic discovery of a near-Earth asteroid.[4][5] The name Summanus is symbolic of the discovery of the asteroid by software running on a (lightning-fast) computer.[1]
Orbit
The orbit is well-established with over 20 years of observations. The closest approach to the Earth in the years 1900–2200 is 0.102 AU (15,300,000 km; 9,500,000 mi) on March 17, 1991, and March 17, 2011. For comparison, the distance to the Moon is about 0.0026 AU (390,000 km; 240,000 mi).
References
- ^ a b "(11885) Summanus = 1990 SS". Minor Planet Center. 2011-04-12.
- ^ a b c "JPL Small-Body Database Browser: 11885 Summanus (1990 SS)" (last observation: 2011-04-12; arc: 7504 days). Jet Propulsion Laboratory. Retrieved 2015-06-08.
- ^ "ABSOLUTE MAGNITUDE (H)". NASA.
- ^ "Twentieth Anniversary of the First Automatic Discovery of a Near-Earth Asteroid by Software -- Spacewatch Project". Spacewatch. September 25, 2010.
- ^ James V. Scotti (1993). Asteroids, Comets, Meteors 1993: Proceedings of the 160th Symposium of the International Astronomical Union, Held in Belgirate, Italy, June 14–18, 1993. Springer Science & Business Media (2012). p. 21. ISBN 9789401111485.
External links
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