128P/Shoemaker–Holt

For other comets discovered by Carolyn and Eugene Shoemaker, see Comet Shoemaker.

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.^[3]

128P/Shoemaker-Holt

Discovery
Discovered by	Carolyn S. Shoemaker Eugene Merle Shoemaker Henry E. Holt
Discovery date	October 18, 1987
Designations
Alternative designations	1988 VII; 1996 S2
Orbital characteristics
Epoch	March 6, 2006
Aphelion	5.952 AU
Perihelion	3.068 AU
Semi-major axis	4.51 AU
Eccentricity	0.3197
Orbital period	9.579 a
Inclination	4.3555°
Last perihelion	May 6, 2017? (A)[1] January 10, 2017[2][3][4] June 13, 2007
Next perihelion	2026-Jul-17 2026-Jul-17 (B)[5] 2027-Jan-10? (A)
Jupiter MOID	0.153 AU (22,900,000 km)
Physical characteristics
Dimensions	4.6 km (B)[6]

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.^[1] Fragment B is estimated to be 4.6 km in diameter.^[6]