11885 Summanus

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

    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

    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

    1. 1 2 "11885 Summanus (1990 SS)". Minor Planet Center. Retrieved 2 November 2017.
    2. 1 2 3 4 5 6 7 8 "JPL Small-Body Database Browser: 11885 Summanus (1990 SS)" (2011-04-12 last obs.). Jet Propulsion Laboratory. Retrieved 2 November 2017.
    3. 1 2 "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.
    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.
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