Japanese version
Home page
Updated on May 13, 2024


* Profile

The perihelion distance is large as 4.3 A.U., and the orbit is almost circular with an eccentricity of 0.12. Kenji Muraoka's calculation revealed that this orbit does not change significantly for 200 years in the 20th and 21st centuries.

It reaches 17.5 mag at best based on the brightness at the discovery in 2007 January. The brightness in 1996 February coincides with it.

However, the comet was unexpectedly bright as 15.5 mag only in 1975 May and June. It seems to be a temporary outburst. In this apparition, the comet returned to be its normal brightness in 1977 July as 18 mag.

This comet is similar to 111P/Helin-Roman-Crockett; large perihelion distance, almost circular orbit, and a record of unexpected brightening in temporary outburst.

* Returns and Appearances

!Discovered *Appeared -Not observed #Appeared before discovery +Not observed before discovery .Returns in the future
2029 Apr. 24
* 186P
2019 May 4
! 186P/2007 B3
2008 Mar. 20
# 186P
1997 Aug. 17
1986 Dec. 26
# 186P/1977 O1
1976 Mar. 21


The apparitions in 1976 and 1997 are printed on M.P.E.C. 2007-D71.
The perihelion date in 1986 is calculated by Hirohisa Sato and Kenji Muraoka.


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