11885 Summanus

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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
MPO 196501
NEO · Apollo[2]
Orbital characteristics[2]
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
Dimensions 0.593 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]

External links[edit]