128P/Shoemaker–Holt, also known as Shoemaker-Holt 1, is a periodic comet in the Solar System. The comet passed close to Jupiter in 1982 and was discovered in 1987. The comet was last observed in March 2018.[4]

Discovered byCarolyn S. Shoemaker
Eugene Merle Shoemaker
Henry E. Holt
Discovery dateOctober 18, 1987
1988 VII; 1996 S2
Orbital characteristics A
EpochMarch 6, 2006
Aphelion5.952 AU
Perihelion3.068 AU
Semi-major axis4.51 AU
Orbital period9.579 a
Jupiter MOID0.153 AU (22,900,000 km)
Dimensions4.6 km (B)[1]
Last perihelionMay 6, 2017? (A)[2]
January 10, 2017[3][4][5]
June 13, 2007
Next perihelion2026-Jul-17
2026-Jul-17 (B)[6]
2027-Jan-10? (A)

The nucleus was split into two pieces (A+B) during the 1997 apparition.[7] Fragment A was last observed in 1996 and only has a 79-day observation arc.[2] Fragment B is estimated to be 4.6 km in diameter.[1]


  1. "JPL Small-Body Database Browser: 128P/Shoemaker-Holt 1-B" (last observation: 1999-04-16). Jet Propulsion Laboratory. Retrieved 2017-04-08.
  2. "JPL Small-Body Database Browser: 128P/Shoemaker-Holt 1-A" (last observation: 1996-12-04). Jet Propulsion Laboratory. Retrieved 2017-04-07.
  3. MPC
  4. "JPL Small-Body Database Browser: 128P/Shoemaker-Holt 1" (last observation: 2018-03-21). Jet Propulsion Laboratory. Retrieved 2017-04-07.
  5. Syuichi Nakano (2006-09-30). "128P/Shoemaker-Holt 1 – B (NK 2190)". OAA Computing and Minor Planet Sections. Retrieved 2012-02-25.
  6. Syuichi Nakano (2018-02-01). "128P/Shoemaker-Holt 1 – B (NK 3529)". OAA Computing and Minor Planet Sections. Retrieved 2020-07-11.
  7. Seiichi Yoshida (2008-08-10). "128P/Shoemaker-Holt 1". Seiichi Yoshida's Comet Catalog. Retrieved 2012-02-25.
Numbered comets
128P/Shoemaker–Holt Next

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