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IAUC 8412: C/2004 S1; 2004er, 2004es

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                                                  Circular No. 8412
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET C/2004 S1 (VAN NESS)
     M. E. Van Ness, Lowell Observatory, reports his discovery of a
comet on CCD images taken by himself with the 0.59-m Schmidt LONEOS
telescope (discovery observation below), reporting an 8" moderately
condensed coma with a fan-shaped tail 155" long in p.a. 225 deg.
B. A. Skiff reports that LONEOS images taken by himself on Sept.
27.4 UT show a nearly circular, poorly condensed coma of red mag
18.0 and about 12" across in bright moonlight.  Following posting
on "The NEO Confirmation Page", J. E. McGaha (Tucson, AZ, 0.36-m
f/10.0 Schmidt-Cassegrain reflector + CCD) reports that 20 stacked
60-s exposures from Sept. 27.3 show an unusual appearance, with a
split fan-shaped tail 18" long in p.a. 280 deg and 250 deg, and an
elongated coma in p.a. 260 deg and no sharp central condensation;
McGaha's 30 stacked exposures on Sept. 28.3 also show a diffuse,
elongated coma 14" (axis along p.a. 265 deg-85 deg) x 4", again
with no sharp condensation, and an 8" fan-shaped tail in p.a. 225
deg.  J. Young reports that CCD frames taken with the Table
Mountain 0.6-m reflector on Sept. 28.28-28.38 show a 4" coma
without any central condensation and a very wide fan-shaped tail
about 6"-8" long spanning p.a. 205 deg-280 deg, and a narrow 25"
'spike' in p.a. 255 deg.

     2004 UT             R.A. (2000) Decl.       Mag.
     Sept.26.25518    3 11 20.77   + 9 32 37.4   18.3

     Additional astrometry, preliminary parabolic orbital elements
(T = 2004 Dec. 9.1 TT, Peri. = 92.5 deg, Node = 19.3 deg, i = 114.6
deg, equinox 2000.0, q = 0.687 AU), and an ephemeris appear on MPEC
2004-S81.


SUPERNOVAE 2004er AND 2004es
     Further to IAUC 8406, H. Pugh, S. Park, and W. Li report the
LOSS discoveries of two apparent supernovae on unfiltered KAIT
images.

SN       2004 UT        R.A.  (2000.0)  Decl.    Mag.     Offset
2004er   Sept. 25.40   2 36 59.04  - 5 21 19.7   17.0   7".3 E, 22".2 S
2004es   Sept. 26.54   7 23 34.62  +41 25 38.3   17.6   15".9 E, 27".0 S

Additional approximate magnitudes:  SN 2004er in MCG -01-7-24,
Sept. 21.38 UT, [19.0; 26.38, 16.8.  SN 2004es in UGC 3825, Apr.
8.21, [19.0; Sept. 27.53, 17.5.  SN 1998C appeared 26" to the north
of 2004es.

                      (C) Copyright 2004 CBAT
2004 September 28              (8412)            Daniel W. E. Green

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