128P/Shoemaker-Holt 1

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Updated on August 25, 2018


* Profile

Kazuo Kinoshita's calculation revealed that it passed only 0.13 A.U. from Jupiter in 1982, and the perihelion distance was reduced from 4.2 A.U. down to 3.1 A.U. It was discovered in 1987 when it came into inner part of the solar system and became bright for the first time.

In the next return in 1997, it became much fainter than at the discovery by 3 mag when recovered. But it started brightening rapidly 4 months prior to the perihelion passage. After the perihelion passage, it reached to the same brightness as at the discovery.

In the next return in 2007, it was as bright as the previous apparition before the perihelion passage. But it kept faint, did not brighten as shown in the previous apparition, even after the perihelion passage.

The nucleus was split into two pieces in 1997 apparition. The unusual brightening in that apparition was probably a temporary event due to the nuclear split. The comet should be usually 18-19 mag at best.

Kazuo Kinoshita's calculation revealed that it will pass only 0.28 A.U. from Jupiter in 2029, and the perihelion distance will be increased up to 4.1 A.U. again. The comet will be extremely faint, fainter than 22 mag at best, after that.

* Returns and Appearances

!Discovered *Appeared -Not observed #Appeared before discovery +Not observed before discovery .Returns in the future
2026 July 17
* 128P
2017 Jan. 10
* 128P
2007 June 13
* 128P/1996 S2
1997 Nov. 20
! 128P/1987 U1
1988 May 21


The perihelion dates in the past appearances are printed on Catalog of Cometary Orbits 1996.
Information on the discovery and historical highlights are available at General Comet Info (Gary W. Kronk).
The past and future orbital elements calculated by Kazuo Kinoshita (http://www9.ocn.ne.jp/~comet/pcmtn/0128p.htm).


Copyright(C) Seiichi Yoshida (comet@aerith.net). All rights reserved.