11885 Summanus
| Discovery[1] | |
|---|---|
| Discovered by | Spacewatch |
| Discovery site | Kitt Peak southwest of Tucson, Arizona, USA |
| Discovery date | 25 September 1990 |
| Designations | |
| MPC designation | 1990 SS |
| MPO 196501 | |
Apollo  NEO | |
| Orbital characteristics[2] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 7504 days (20.54 yr) |
| Aphelion | 2.511961332 AU (375.7840665 Gm) |
| Perihelion | 0.894558836 AU (133.8240971 Gm) |
| 1.703260084 AU (254.8040818 Gm) | |
| Eccentricity | 0.47479610 |
| 2.22 yr (811.93 d) | |
Average orbital speed | 21.4743560 km/s |
| 80.7443653° | |
| 0° 26m 36.192s / day | |
| Inclination | 19.4198168° |
| 359.890291° | |
| 116.070841° | |
| Earth MOID | 0.067275 AU (10.0642 Gm) |
| Jupiter MOID | 2.77022 AU (414.419 Gm) |
| Jupiter Tisserand parameter | 4.005 |
| Physical characteristics | |
| Dimensions | 530–1200 m[3] |
| 7.358 h (0.3066 d) | |
Sidereal rotation period | 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
- 1 2 "(11885) Summanus = 1990 SS". Minor Planet Center. 2011-04-12.
- 1 2 3 "JPL Small-Body Database Browser: 11885 Summanus (1990 SS)" (last observation: 2011-04-12; arc: 7504 days). Jet Propulsion Laboratory. Retrieved 9 April 2016.
- ↑ "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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