C/2009 P1 (Garradd)
< C
Comet C/2009 P1 (Garradd) imaged from Italy on 23 September 2011 | |
| Discovery | |
|---|---|
| Discovered by | Gordon J. Garradd |
| Discovery site | Siding Spring Observatory |
| Discovery date | 10 August 2009 |
| Orbital characteristics | |
| Epoch | 22 November 2011 (JD 2455887.5) |
| Observation arc | 5.42 years |
| Earliest precovery date | 27 September 2008 |
| Number of observations | 9,044 |
| Aphelion | ~4,770 AU (inbound) ~12,000 AU (outbound) |
| Perihelion | 1.551 AU |
| Eccentricity | 0.99935 (inbound) 0.99974 (outbound) |
| Orbital period | ~116,000 years (inbound) ~462,000 years (outbound) |
| Inclination | 106.18° |
| 325.99° | |
| Argument of periapsis | 90.747° |
| Mean anomaly | –0.0005° |
| Last perihelion | 23 December 2011 |
| TJupiter | –0.432 |
| Earth MOID | 1.253 AU |
| Jupiter MOID | 1.307 AU |
| Physical characteristics | |
| Dimensions | 3.2–6.8 km (2.0–4.2 mi) |
Mean diameter | 5.0 km (3.1 mi) |
| 11.0±0.8 hours | |
| Comet total magnitude (M1) | 8.8 |
| 5.8 (2012 apparition) | |
Comet Garradd, formal designation C/2009 P1, is a non-periodic comet that was observed between September 2008 and March 2013. It is one of 17 comets discovered by Australian astronomer, Gordon J. Garradd.