82P/Gehrels

82P/Gehrels is a periodic comet that was discovered on October 27, 1975, by Tom Gehrels at the Palomar Mountain Observatory in California having a faint nuclear brightness of magnitude 17.[1]

82P/Gehrels
Discovery
Discovered byTom Gehrels
Discovery dateOctober 27, 1975
Alternative
designations		Gehrels 3
Orbital characteristics A
Epoch2011-Feb-08
2455600.5
Aphelion4.6509 AU
Perihelion3.6333 AU[1]
Semi-major axis4.1421 AU
Eccentricity0.12284
Orbital period8.43 a
Inclination1.1259°
Last perihelion2018 June 28[2][3]
2010-Jan-12[1]
Next perihelion2026-Nov-14 (JPL Horizons last obs 2020-05-20)

Calculations based on the early sightings gave an estimated perihelion of 23 April 1975 and an orbital period of 8.11 years. It was observed by J. Gibson on its next predicted apparition in 1984, using the 122-cm Schmidt at Palomar, when he estimated the nuclear brightness at a very faint magnitude 20. It has since been observed in 1993, 2001 and 2010.[4]

The object has been identified as a quasi-Hilda comet, which means it is near a 3:2 mean-motion resonance with the planet Jupiter.[5] It fits the definition of an Encke-type comet with (TJupiter > 3; a < aJupiter).[1] It has an estimated diameter of 1.46 km.[6]

On 15 August 1970 the comet passed 0.00143 AU (214,000 km; 133,000 mi) from Jupiter.[7]

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References
  1. "JPL Small-Body Database Browser: 82P/Gehrels 3" (2011-03-14 last obs). Jet Propulsion Laboratory. Retrieved 2012-02-18.
  2. Seiichi Yoshida (2011-07-03). "82P/Gehrels 3". Seiichi Yoshida's Comet Catalog. Retrieved 2012-02-18.
  3. Patrick Rocher (2011-03-23). "Note number : 0090 P/Gehrels 3 : 82P". Institut de mécanique céleste et de calcul des éphémérides. Retrieved 2012-02-19.
  4. "82P/Gehrels 3/publisher= Cometography". Retrieved 24 February 2015.
  5. Ohtsuka, K.; Ito, T.; Yoshikawa, M.; Asher, D. J.; Arakida, H. (1 October 2008). "Quasi-Hilda comet 147P/Kushida-Muramatsu. Another long temporary satellite capture by Jupiter". Astronomy and Astrophysics. 489 (3): 1355–1362. arXiv:0808.2277. Bibcode:2008A&A...489.1355O. doi:10.1051/0004-6361:200810321.
  6. Lamy, P. L.; Toth, I.; Fernandez, Y. R.; Weaver, H. A. (2004). M. C. Festou; H. U. Keller; H. A. Weaver (eds.). The sizes, shapes, albedos, and colors of cometary nuclei. Bibcode:2004come.book..223L.
  7. "JPL Close-Approach Data: 82P/Gehrels 3" (2011-03-14 last obs). Retrieved 2012-07-28.
Numbered comets
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81P/Wild		 82P/Gehrels Next
83D/Russell
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