78P/Gehrels

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78P/Gehrels
Discovery
Discovered by Tom Gehrels
Discovery date September 23, 1973
Alternative
designations
1973 XI; 1981 XVII; 1989 XVII
Orbital characteristics A
Epoch March 6, 2006
Aphelion 5.462 AU
Perihelion 2.009 AU
Semi-major axis 3.735 AU
Eccentricity 0.4622
Orbital period 7.22 yr
Inclination 6.2530°
Last perihelion January 12, 2012[1]
October 27, 2004[2][3]
Next perihelion 2019 April 2[4]

78P/Gehrels, also known as Gehrels 2, is a periodic comet in the Solar System.

Outward migration[edit]

Comet 78P/Gehrels' aphelion (furthest distance from the Sun) of 5.4AU[1] is in the zone of control of the giant planet Jupiter and the orbit of the comet is frequently perturbed by Jupiter.[5] On September 15, 2029, the comet will pass within 0.018 AU (2.7 million kilometers) of Jupiter[5] and be strongly perturbed. By the year 2200, the comet will have a centaur-like orbit with a perihelion (closest distance to the Sun) near Jupiter.[6] This outward migration from a perihelion of 2AU to a perihelion of ~5AU could cause the comet to go dormant.

The Outward Migration of Comet 78P/Gehrels
AU 2009[1] 2030 2200[6]
Semi-major axis 3.73 6.02 9.37
Perihelion 2.00 4.08 4.99
Aphelion 5.46 7.96 13.7
Comet 78P passing within 0.018 AU of Jupiter in 2029.[5]

References[edit]

  1. ^ a b c "JPL Small-Body Database Browser: 78P/Gehrels 2". 2011-05-21 last obs. Retrieved 2009-05-11. 
  2. ^ Seiichi Yoshida (2006-10-03). "78P/Gehrels 2". Seiichi Yoshida's Comet Catalog. Retrieved 2010-02-24. 
  3. ^ Syuichi Nakano (2009-04-20). "78P/Gehrels 2 (NK 1760)". OAA Computing and Minor Planet Sections. Retrieved 2010-02-24. 
  4. ^ Syuichi Nakano (2011-06-10). "78P/Gehrels 2 (NK 2102)". OAA Computing and Minor Planet Sections. Retrieved 2012-02-18. 
  5. ^ a b c "JPL Close-Approach Data: 78P/Gehrels 2". 2006-02-26 last obs. Retrieved 2009-05-11. 
  6. ^ a b Heider. "Orbital Elements of 78P/Gehrels in 2200". Retrieved 2009-05-11. 

External links[edit]

Periodic comets (by number)
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