11885 Summanus
| Discovery[1] | |
|---|---|
| Discovered by | Spacewatch |
| Discovery site | Kitt Peak Obs. |
| Discovery date | 25 September 1990 |
| Designations | |
| 1990 SS | |
| Pronunciation | /sʌˈmeɪnəs/[2] |
Named after | Summānus |
| NEO · Apollo[3] | |
| Orbital characteristics[3] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 20.54 yr (7,504 days) |
| Aphelion | 2.5119 AU |
| Perihelion | 0.8950 AU |
| 1.7035 AU | |
| Eccentricity | 0.4746 |
| 2.22 yr (812 days) | |
| 346.75° | |
| 0° 26m 35.88s / day | |
| Inclination | 19.419° |
| 359.89° | |
| 116.07° | |
| Earth MOID | 0.0689 AU (26.8 LD) |
| Physical characteristics | |
| 1.298±0.446 km[3] | |
| 7.358 h[4] | |
| 0.033±0.029[3] | |
| 18.5[3] | |
11885 Summanus (prov. designation: 1990 SS) is a dark asteroid and large near-Earth object of the Apollo group. It was discovered by astronomers with the Spacewatch programm at Kitt Peak Observatory on 25 September 1990. The object has a rotation period of 7.3 hours and measures approximately 1.3 kilometers (0.8 miles) in diameter.[3] It was named after Summanus, the Roman deity of nocturnal lightning and thunder.[1]
Discovery and naming
[edit]Summanus was discovered on 25 September 1990, by Spacewatch survey at the Kitt Peak Observatory, southwest of Tucson, Arizona, United States. It was the first fully automatic discovery of a near-Earth asteroid.[5][6] The name Summanus is symbolic of the discovery of the asteroid by software running on a (lightning-fast) computer.[1]
Orbit
[edit]The orbit is well-established with over 20 years of observations. Summanus orbits the Sun in the inner main-belt at a distance of 0.9–2.5 AU once every 2 years and 3 months (812 days). Its orbit has an eccentricity of 0.47 and an inclination of 19° with respect to the ecliptic.[3]
The closest approach to the Earth in the years 1900–2200 is 0.102 AU (15,300,000 km; 9,500,000 mi) on 17 March 1991, and 17 March 2011. For comparison, the distance to the Moon is about 0.0026 AU (390,000 km; 240,000 mi).
References
[edit]- ^ a b c "11885 Summanus (1990 SS)". Minor Planet Center. Retrieved 2 November 2017.
- ^ Noah Webster (1884) A Practical Dictionary of the English Language
- ^ a b c d e f g "JPL Small-Body Database Browser: 11885 Summanus (1990 SS)" (2011-04-12 last obs.). Jet Propulsion Laboratory. Archived from the original on 27 July 2020. Retrieved 2 November 2017.
- ^ "LCDB Data for (11885) Summanus". Asteroid Lightcurve Database (LCDB). Retrieved 2 November 2017.
- ^ "Twentieth Anniversary of the First Automatic Discovery of a Near-Earth Asteroid by Software -- Spacewatch Project". Spacewatch. 25 September 2010. Archived from the original on 22 September 2015. Retrieved 9 June 2015.
- ^ 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
[edit]- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- 11885 Summanus at NeoDyS-2, Near Earth Objects—Dynamic Site
- 11885 Summanus at ESA–space situational awareness
- 11885 Summanus at the JPL Small-Body Database
