(meteorobs) Comets of 1668 and 1843

[Gary W. Kronk]

Actually, the accepted period of C/1843 D1 is considered to be somewhere
between 355 and 800 years, as determined by H. Kreutz (1901), B. G.
Marsden (1989), Z. Sekanina (2002). These were all determined using the
actual observations of the comet and/or a slight fudging of the orbit to
make C/1843 D1 and C/1880 C1 siblings of a comet from the previous
perihelion passage (mid-11th century). During 2008, a paper by Sekanina
and P. W. Chodas considered the observations and the overall evolution
of the Kreutz sungrazing family of comets. They determined the period
was likely 742 years, based on a probable link to the sungrazer X/1106
C1.

Marsden did look at a period of 175 years in 1989, in an attempt to link
C/1843 D1 to C/1668 E1; however, he found that this period did not fit
the 1843 nighttime observations as well as the longer periods and did
not fit the 1843 daytime observations at all.

Sincerely,
Gary



> -------- Original Message --------
> Subject: (meteorobs) Comets of 1668 and 1843
> From: Pat Branch <pat_branch at yahoo.com>
> Date: Tue, April 29, 2014 8:58 am
> To: "meteorobs at meteorobs.org" <meteorobs at meteorobs.org>
> 
> 
> If the comets of 1668 and 1843 are the same (period of 175 years versus 170 year period calculated for 1843 long ago)...then there should be a repeat in late Feb 2018.
> Is it too early to start looking for that comet in large telescopes? If we assume they are the same, then we can correct the rough orbit of 1843 with the predicted 2018 passage time and get a rough current location.
> Are we still 2-3 years away from being able to spot it?<hr>_______________________________________________
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