27P/Crommelin
| Discovery | |
|---|---|
Semi-major axis | 9.204 AU |
| Eccentricity | 0.919 |
| Orbital period | 27.9 yr 27y 10m 2d (perihelion to perihelion) |
| Inclination | 28.96° |
| Last perihelion | August 3, 2011[1][2] February 20, 1984[1] |
| Next perihelion | May 27, 2039[1][2][3] |
Comet Crommelin, also known as Comet Pons-Coggia-Winnecke-Forbes, is a
Observational history
The first observation was by Jean-Louis Pons (Marseille, France) on February 23, 1818, he followed the comet until February 27 but was prevented further by bad weather. Johann Franz Encke attempted to calculate the orbit but was left with very large errors.
In 1872,
The next observation was on November 10, 1873, by Jérôme E. Coggia (Marseille, France), and again on November 11 by Friedrich A. T. Winnecke (Strasbourg, France), but it was lost by November 16. Weiss and Hind took up the calculations and tried to match it again with the 1818 appearance.
A third discovery was by Alexander F. I. Forbes (Cape Town, South Africa) on November 19, 1928, and confirmed by Harry E. Wood (Union Observatory, South Africa) on November 21. It was Crommelin who eventually established the orbit and finally linked the 1818 (Pons) and 1873 (Coggia-Winnecke) comets to it (also see Lost comet).
On its latest return, 27P/Crommelin was recovered on May 12, 2011, at apparent magnitude 18.7[4] and peaked at magnitude 10.7 at perihelion on August 3.[5] 27P/Crommelin was last observed in January 2012 and passed 1.5 AU from Saturn on July 11, 2015.[6]
The next
On December 22, 2120 it will pass 0.297 AU (44.4 million km) from Earth.[6]
References
- ^ a b c d MPC
- ^ Syuichi Nakano (2012-02-04). "27P/Crommelin (NK 2190)". OAA Computing and Minor Planet Sections. Retrieved 2012-02-18.
- ^ a b c "Horizons Batch for 27P/Crommelin (90000381) on 2039-May-27" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Retrieved 2023-05-12. (JPL#6 Soln.date: 2023-May-12)
- IAU Minor Planet Center. 2011-06-02. Retrieved 2011-06-13.
- ^ Seiichi Yoshida (2013-02-10). "27P/Crommelin (2011) - Magnitudes Graph". Retrieved 2016-03-19.
- ^ a b "JPL Small-Body Database Browser: 27P/Crommelin" (last observation: 2012-01-26). Jet Propulsion Laboratory. Retrieved 2023-05-12.
External links
- Orbital simulation from JPL (Java) / Horizons Ephemeris
- 27P/Crommelin at the Minor Planet Center's Database
- 27P at Kronk's Cometography
- 27P at Kazuo Kinoshita's Comets
- 27P at Seiichi Yoshida's Comet Catalog
- 27P at Earthrise Institute
- Lightcurve (Artyom Novichonok)
- 27P as seen by 10" GRAS-04 on 2011-05-30 (60 sec x 8)
- 27P as seen by 20" RCOS on 2011-07-10 Archived 2016-08-05 at the Wayback Machine (30 sec x 12; Joseph Brimacombe)
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