P/2011 S1 (Gibbs)
Periodic comet or active centaur
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P/2011 S1 (Gibbs) is a periodic comet or an active centaur with a 25-year orbit around the Sun.
Discoverydate19 September 2011
| Discovery[1] | |
|---|---|
| Discovered by | Alex R. Gibbs |
| Discovery site | Mount Lemmon Survey |
| Discovery date | 19 September 2011 |
| Orbital characteristics[2] | |
| Epoch | 5 June 2013 (JD 2456448.5) |
| Observation arc | 8.26 years |
| Earliest precovery date | 29 September 2010 |
| Number of observations | 148 |
| Aphelion | 10.409 AU |
| Perihelion | 6.894 AU |
| Semi-major axis | 8.652 AU |
| Eccentricity | 0.20315 |
| Orbital period | 25.448 years |
| Inclination | 2.679° |
| 218.89° | |
| Argument of periapsis | 193.37° |
| Mean anomaly | 342.76° |
| Last perihelion | 24 August 2014 |
| Next perihelion | 2 November 2039[3] |
| TJupiter | 3.124 |
| Earth MOID | 5.903 AU |
| Jupiter MOID | 1.885 AU |
| Physical characteristics[2] | |
Mean radius | 4.0 km (2.5 mi)[4] |
| Comet total magnitude (M1) | 7.1 |
| Comet nuclear magnitude (M2) | 11.5 |
Discovery
American astronomer, Alex R. Gibbs, reported the discovery of a new object from CCD images obtained from the 1.5 m (4.9 ft) reflector telescope from the Mount Lemmon Survey on 19 September 2011.[1] Precovery images show that the object produced comet-like activity as early as September 2010, a year before its discovery.[6]
