[IAUC] CBET 3715: 20131116 : COMET C/2012 S1 (ISON)

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                                                  Electronic Telegram No. 3715
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


COMET C/2012 S1 (ISON)
     H. Boehnhardt, C. Tubiana, N. Oklay, and J. B. Vincent, Max Planck
Institute for Solar System Research, Katlenburg-Lindau; and U. Hopp, C. Ries,
M. Schmidt, A. Riffeser, and C. Goessl, Astronomical Institute, Ludwig
Maximilian University, Munich, report the detection of coma wings in Laplace-
filter-processed CCD exposures of comet C/2012 S1 obtained with the 0.4-m
telescope of the Mt. Wendelstein Observatory on Nov. 14.16-14.21 and
16.16-16.21 UT.  The arclet-like wings appeared in opposite direction from
the nucleus at position angles 15 and 195 deg on Nov. 14 and at p.a. 25 and
205 deg on Nov. 16.  The coma wings extended straight from the nucleus for
about 4700 km on Nov. 14 and 13500 km on Nov. 16 on either side of the
extended radius vector and continued in streamers of the plasma tail.  No
coma wings were found in similar exposures obtained on Nov. 13.  The coma
wings suggest the presence of two or more sub-nuclei with individual
expanding atmospheres in the overall cometary coma and may indicate recent
nucleus splitting in the comet.


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                         (C) Copyright 2013 CBAT
2013 November 16                 (CBET 3715)              Daniel W. E. Green