11885 Summanus

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11885 Summanus
Discovery [1]
Discovered bySpacewatch
Discovery siteKitt Peak Obs.
Discovery date25 September 1990
Designations
MPC designation1990 SS
MPO 196501
NEO · Apollo[2]
Orbital characteristics[2]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc20.54 yr (7,504 days)
Aphelion2.5119 AU
Perihelion0.8950 AU
1.7035 AU
Eccentricity0.4746
2.22 yr (812 days)
346.75°
0° 26m 35.88s / day
Inclination19.419°
359.89°
116.07°
Earth MOID0.0689 AU · 26.8 LD
Physical characteristics
Dimensions0.593 km (calculated)[3]
1.298±0.446 km[2]
7.358 h (0.3066 d)[2]
0.033±0.029[2]
S (assumed)[3]
18.5[2]

11885 Summanus, provisionally designated 1990 SS, is an asteroid and a near-Earth object of the Apollo group, approximately 1 kilometer in diameter.[2]

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.[4][5] 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.[2]

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]

  1. ^ a b "11885 Summanus (1990 SS)". Minor Planet Center. Retrieved 2 November 2017.
  2. ^ a b c d e f g h "JPL Small-Body Database Browser: 11885 Summanus (1990 SS)" (2011-04-12 last obs.). Jet Propulsion Laboratory. Retrieved 2 November 2017.
  3. ^ a b "LCDB Data for (11885) Summanus". Asteroid Lightcurve Database (LCDB). Retrieved 2 November 2017.
  4. ^ "Twentieth Anniversary of the First Automatic Discovery of a Near-Earth Asteroid by Software -- Spacewatch Project". Spacewatch. September 25, 2010. Archived from the original on 2015-09-22. Retrieved 2015-06-09.
  5. ^ 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]