82P/Gehrels

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82P/Gehrels
Discovery
Discovered by Tom Gehrels
Discovery date October 27, 1975
Alternative
designations		 Gehrels 3
Orbital characteristics A
Epoch 2011-Feb-08
2455600.5
Aphelion 4.6509 AU
Perihelion 3.6333 AU[1]
Semi-major axis 4.1421 AU
Eccentricity 0.12284
Orbital period 8.43 a
Inclination 1.1259°
Last perihelion 2010-Jan-12[1]
Next perihelion 2018 June 28[2][3]

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]

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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Periodic comets (by number)
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81P/Wild		 82P/Gehrels Next
83D/Russell


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