D/1977 C1 ( Skiff-Kosai )

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Updated on December 10, 2022


* Profile

It was observed for only one month between February 13 and March 12 in 1977. It has not been observed since that.

The condition was worst at the discovery, at conjunction with the sun around the perihelion passage. It has been returning in better condition than at the discovery every time since that, but not been observed.

Kazuo Kinoshita's calculation revealed that it passed close by Jupiter in 1973, then the perihelion distance dramatically decreased from 5.9 A.U. down to 2.8 A.U. Probably it was in outburst in 1977 because it came closer to the sun for the first time.

It was not observed in 1999, so the usual brightness must be fainter than at the discovery by 3 mag or more. It must be fainter than 20 mag usually.

Kazuo Kinoshita's calculation reveals that it will pass close by Jupiter in 2055 again, then the perihelion distance increases up to 3.8 A.U. As a result, it will be apparently fainter furthermore by 3 mag, and it will never be brighter than 23 mag.

* Returns and Appearances

!Discovered *Appeared -Not observed #Appeared before discovery +Not observed before discovery .Returns in the future
2029 Jan. 23
2021 July 27
2014 Feb. 10
2006 Aug. 31
1999 Mar. 9
1991 Sept.14
1984 Feb. 26
! D/1977 C1
1976 Aug. 4


The perihelion dates in the past appearances are printed on Catalog of Cometary Orbits 1996.
The perihelion dates of non-observed returns from 1984 to 1991 are calculated using the Minor Planet & Comet Ephemeris Service.
The past and future orbital elements calculated by Kazuo Kinoshita (http://www9.ocn.ne.jp/~comet/pcmt/j77c1.htm).


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