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Updated on December 10, 2022


* Profile

The orbit is almost circular, and the comet is always so faint, fainter than 20 mag.

However, it brightened up to 14.7 mag in unusual outburst in 1989, and it was discovered.

Kazuo Kinoshita's calculation revealed that it passed extremely close by Jupiter in 1976, down to 0.012 A.U. It may have caused the outburst in 1989. It will pass extremely close by Jupiter again in 2071, down to 0.037 A.U.

Around the two great approaches to Jupiter, the comet rotates around Jupiter for a while. But the perihelion distance or eccentricity does not change so much, and the comet keeps always so faint, fainter than 20 mag.

* Returns and Appearances

!Discovered *Appeared -Not observed #Appeared before discovery +Not observed before discovery .Returns in the future
2029 Dec. 9
2021 June 15
* 111P
2013 Jan. 30
* 111P
2004 Dec. 27
* 111P
1996 Oct. 31
! 111P/1989 A2
1988 Sept.13


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/0111p.htm).


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