Astronomy:11885 Summanus
| Discovery[1] | |
|---|---|
| Discovered by | Spacewatch |
| Discovery site | Kitt Peak Obs. |
| Discovery date | 25 September 1990 |
| Designations | |
| 1990 SS | |
| Pronunciation | /sʌˈmeɪnəs/[3] |
| Named after | Summānus |
| Minor planet category | NEO · Apollo[2] |
| Orbital characteristics[2] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 20.54 yr (7,504 days) |
| |{{{apsis}}}|helion}} | 2.5119 AU |
| |{{{apsis}}}|helion}} | 0.8950 AU |
| 1.7035 AU | |
| Eccentricity | 0.4746 |
| Orbital period | 2.22 yr (812 days) |
| Mean anomaly | 346.75° |
| Mean motion | 0° 26m 35.88s / day |
| Inclination | 19.419° |
| Longitude of ascending node | 359.89° |
| 116.07° | |
| Earth MOID | 0.0689 AU (26.8 LD) |
| Physical characteristics | |
| Mean diameter | 1.298±0.446 km[2] |
| Rotation period | 7.358 h[4] |
| Geometric albedo | 0.033±0.029[2] |
| Absolute magnitude (H) | 18.5[2] |
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.[2] It was named after Summanus, the Roman deity of nocturnal lightning and thunder.[1]
Discovery and naming
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
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.[2]
The closest approach to the Earth in the years 1900–2200 is 0.102 astronomical unit|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 astronomical unit|AU (390,000 km; 240,000 mi).
References
- ↑ 1.0 1.1 1.2 "11885 Summanus (1990 SS)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=11885. Retrieved 2 November 2017.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 "JPL Small-Body Database Browser: 11885 Summanus (1990 SS)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011885. Retrieved 2 November 2017.
- ↑ Noah Webster (1884) A Practical Dictionary of the English Language
- ↑ "LCDB Data for (11885) Summanus". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=11885%7CSummanus. Retrieved 2 November 2017.
- ↑ "Twentieth Anniversary of the First Automatic Discovery of a Near-Earth Asteroid by Software -- Spacewatch Project". Spacewatch. September 25, 2010. http://spacewatch.lpl.arizona.edu/1990_SS_text.html.
- ↑ 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. https://books.google.com/books?id=G8noCAAAQBAJ&q=1990+SS&pg=PA21.
External links
- Asteroid Lightcurve Database (LCDB), query form (info )
- 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
- Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
- 11885 Summanus at ESA–space situational awareness
- 11885 Summanus at the JPL Small-Body Database
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