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11885 Summanus
Discovery^[1]
Discovered by	Spacewatch
Discovery site	Kitt Peak Obs.
Discovery date	25 September 1990
Designations
MPC designation	1990 SS
Pronunciation	/sʌˈmeɪnəs/^[2]
Named after	Summānus
Minor planet category	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
Semi-major axis	1.7035 AU
Eccentricity	0.4746
Orbital period (sidereal)	2.22 yr (812 days)
Mean anomaly	346.75°
Mean motion	0° 26^m 35.88^s / day
Inclination	19.419°
Longitude of ascending node	359.89°
Argument of perihelion	116.07°
Earth MOID	0.0689 AU (26.8 LD)
Physical characteristics
Mean diameter	1.298±0.446 km^[3]
Synodic rotation period	7.358 h^[4]
Geometric albedo	0.033±0.029^[3]
Absolute magnitude (H)	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

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.^[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

^ ^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

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
- Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
11885 Summanus at ESA–space situational awareness
- Ephemerides · Observations · Orbit · Physical properties · Summary
11885 Summanus at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

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