108P/Ciffréo
108P/Ciffréo is a periodic comet with an orbital period of 7 years discovered by Jacqueline Ciffréo on November 8, 1985.[5] The comet is noted for having a peculiar double morphology, in which the nucleus is accompanied by a comoving, detached, diffuse tail, which is probably a perspective artifact of particles ejected sunwards and then repelled by solar wind.[4][6]
Comet 108P/Ciffréo from 31 January to 24 May 2022 | |
| Discovery[1] | |
|---|---|
| Discovered by | Jacqueline Ciffréo |
| Discovery date | 8 November 1985 |
| Designations | |
| 1985p, 1985 XVI, 1992s, 1993 I | |
| Orbital characteristics[3] | |
| Epoch | 19 May 2018 |
| Aphelion | 5.759 AU |
| Perihelion | 1.526 AU |
| Semi-major axis | 3.642 AU |
| Eccentricity | 0.581 |
| Orbital period | 6.95 years |
| Inclination | 13.980° |
| 52.402° | |
| Argument of periapsis | 356.86° |
| Last perihelion | 11 October 2021 |
| Next perihelion | 2028-Dec-09[2] |
| Earth MOID | 0.535 AU |
| Jupiter MOID | 0.283 AU |
| Physical characteristics | |
Mean diameter | 3.2 km [3] 1 km[4] |
| Comet total magnitude (M1) | 10.9 [3] |
The comet was discovered by Jacqueline Ciffréo on 8 November 1985 using a 0.9 m Schmidt camera at Caussols. The comet was then a diffuse object with an apparent magnitude of 10. H. Kosai from the Tokyo Observatory noticed on 9 November that it also had a faint tail about 1.5 arcminutes long.[1] An elliptical orbit was published by Daniel W. E. Green on 18 November, with an estimated orbital period of 7.81 years, while perihelion had taken place on 28 October 1985 at a distance of 1.72 AU.[7] Further observations revealed that the perihelion was on 30 October and the orbital period of the comet was 7.22 years.[5] On December 1985 a detacted coma or tail was detected 6 arcseconds from the nucleus of the comet and extending for 20 arcseconds to the north-east. The visual magnitude of the comet was estimated to be 12.5.[8]
The comet was recovered on 1992 September 24 by J. V. Scotti with the Spacewatch telescope. The comet passed perihelion on 23 January 1993. The next perihelion was in April 2000 and the comet was observed in November and December 1999 and November and December 2000.[5] During the 2014 and 2021 apparition the comet featured a detached coma, similar to that observed in 1985.[6] The peculiar morphology was attributed to a possible fragmentation event[9] but further observations revealed it is most probably an artifact of the turnaround of particles ejected sunward and repelled by sunlight.[4]
References edit
- ^ a b Heudier, J. -L.; Ciffreo, J.; Kosai, H. (12 November 1985). "Comet Ciffreo (1985p)". International Astronomical Union Circular (4135): 1. ISSN 0081-0304.
- ^ "Horizons Batch for 108P/Ciffreo (90000970) on 2028-Dec-09" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Retrieved 2023-04-29. (Soln.date: 2022-Aug-16)
- ^ a b c "Small-Body Database Lookup: 108P/Ciffreo". ssd.jpl.nasa.gov. Retrieved 26 March 2023.
- ^ a b c Kim, Yoonyoung; Jewitt, David; Luu, Jane; Li, Jing; Mutchler, Max (1 April 2023). "Comet 108P/Ciffreo: The Blob". The Astronomical Journal. 165 (4): 150. arXiv:2302.03697. doi:10.3847/1538-3881/acba07.
- ^ a b c Kronk, Gary. "108P/Ciffreo". cometography.com. Retrieved 26 March 2023.
- ^ a b Manzini, Federico; Ochner, Paolo; Oldani, Virginio; Bedin, Luigi R.; Reguitti, Andrea; Bosch, Jean Gabriel; Soulier, Jean François (25 January 2022). "Comet C/108P (Ciffreo) is not splitting". The Astronomer's Telegram. 15177: 1.
- ^ Green, Daniel (18 November 1985). "IAUC 4137: 1985p; CH Cyg; MU Cep". Central Bureau for Astronomical Telegrams.
- ^ Marsden, Brian (3 January 1986). "IAUC 4158: PLUTO; 1985p". Central Bureau for Astronomical Telegrams.
- ^ Jewitt, David; Agarwal, Jessica; Kim, Yoonyoung; Li, Jing; Mutchler, Max (1 January 2022). "Disintegrating Comet 108P/Ciffreo". HST Proposal: 16904. Bibcode:2022hst..prop16904J.