273P/Pons–Gambart
 The comet on 18 March 2013 by the Palomar Transient Factory | |
| Discovery | |
|---|---|
| Discovered by | Jean-Louis Pons, Jean-Félix Adolphe Gambart (first discovery) Rob Matson (second discovery) |
| Discovery date | June 21, 1827 (first discovery) November 7, 2012 (second discovery) |
| Designations | |
| C/1827 M1; C/2012 V4 | |
| Orbital characteristics | |
| Epoch | 2014-May-22 (2456799.5) |
| Aphelion | 64.274 AU |
| Perihelion | 0.81043 AU |
| Semi-major axis | 32.542 AU |
| Eccentricity | 0.97509 |
| Orbital period | 185.6 years |
| Inclination | 136.39 |
| Last perihelion | December 19, 2012[1] June 8, 1827 |
| Next perihelion | ≈2191-Aug-09[2] |
| TJupiter | -0.643 |
| Earth MOID | 0.17 AU (25 million km) |
273P/Pons–Gambart, also called Comet Pons-Gambart, is a periodic comet in a retrograde orbit first discovered on June 21, 1827 by Jean-Louis Pons and Jean-Félix Adolphe Gambart. It has a 186 year orbit and it fits the classical definition of a Halley-type comet (20 years < period < 200 years). Its last perihelion was in December 2012 and will next come to perihelion around August 2191.[2]
The orbit was initially considered to be parabolic, but its orbit was recalculated in 1917 and it was found to be elliptical with an orbital period determined to be 64 years with 10 years uncertainly.[3] The comet was considered lost until November 7, 2012, when amateur astronomer Rob Matson discovered a comet in images taken by SWAN instrument on board SOHO, and it was identified that the pre-recovery short-arc orbital calculations for Pons-Gambart were completely wrong because the comet only had a 1-month observation arc with poor data and that was the first perihelion after the 1827 apparition.[3] It was last observed in April 2014 when it was 5.8 AU (870 million km) from the Sun.[1]
The original name when first discovered was C/1827 M1.[4] Before the 2012 return, when Comet Pons–Gambart was speculated to have a roughly 60 year orbit it was suspected of possibly being comet C/1110 K1.[5]
Of the numbered periodic comets only 153P/Ikeya-Zhang has a longer orbital period.
See also[edit]
References[edit]
- ^ a b MPC
- ^ a b "Horizons Batch for 273P/Pons-Gambart on 2191-Aug-09" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Archived from the original on May 2, 2023. Retrieved May 2, 2023. (JPL#11/Soln.date: 2021-Apr-15)
- ^ a b Kronk, Gary W. "273P/Pons-Gambart". Retrieved September 6, 2015.
- ^ Seargent, David A. J. (March 15, 2017). Visually Observing Comets. Springer. ISBN 9783319454351.
- ^ Hasegawa, Ichiro; Nakano, Syuichi (October 1995). "Periodic Comets Found in Historical Records". Publications of the Astronomical Society of Japan. 47 (5): 699–710. Bibcode:1995PASJ...47..699H.
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