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IAUC 7335: 1999gn; C/1999 S4

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                                                  Circular No. 7335
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVA 1999gn IN M61
     Alessandro Dimai, Cortina, Italy, reports his discovery of an
apparent supernova (mag 16.0) on an arm of the host galaxy (NGC
4303 = M61), found on a CCD frame taken on Dec. 17.22 UT with a
0.50-m telescope.  He reported the new object as being 35" east and
25" south of the galaxy nucleus; the new star is not present in J.
Wray's Color Atlas of Galaxies.  W. Li, University of California at
Berkeley, reports that an image taken on Dec. 18.5 with the Katzman
Automatic Imaging Telescope (KAIT) shows SN 1999gn at mag about
15.5.  Li measured a position for SN 1999gn:  R.A. = 12h21m57s.02,
Decl. = +4o27'45".6 (equinox 2000.0), which is 31".7 east and 39".8
south of the nucleus of M61.  A KAIT image taken on Nov. 26.5
showed nothing at the position of the new star (limiting mag about
19.0).  Previous supernovae in M61 were 1926A, 1961I, and 1964F.


COMET C/1999 S4 (LINEAR)
     Improved parabolic orbital elements from MPC 37026 (and
ephemeris extension to IAUC 7285):

     T = 2000 July 26.1053 TT         Peri. = 151.0719
                                      Node  =  83.1520  2000.0
     q = 0.763984 AU                  Incl. = 149.3583

1999/00     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Dec. 28     2 21.84   +33 00.8   2.627   3.305  126.2   13.9   14.3
Jan.  7     2 05.20   +31 22.1   2.673   3.187  112.9   16.5   14.2
     17     1 52.35   +29 49.1   2.737   3.067  100.1   18.4   14.1
     27     1 43.03   +28 28.4   2.811   2.946   88.0   19.5   13.9
Feb.  6     1 36.81   +27 23.4   2.884   2.823   76.6   19.9   13.8
     16     1 33.19   +26 35.5   2.948   2.699   65.8   19.5   13.7
     26     1 31.69   +26 03.9   2.997   2.573   55.7   18.5   13.5
Mar.  7     1 31.89   +25 47.6   3.025   2.445   46.1   17.0   13.3
     17     1 33.44   +25 45.4   3.028   2.315   37.2   15.1   13.1

     Visual m_1 estimates:  Nov. 13.51 UT, 13.9 (Y. Nagai,
Yamanashi, Japan, 0.40-m reflector); 17.45, 13.8 (A. Hale,
Cloudcroft, NM, 0.41-m reflector); 27.76, 14.0 (W. Hasubick,
Buchloe, Germany, 0.44-m reflector); Dec. 7.03, 13.7 (J. Carvajal,
Avila, Spain, 0.45-m reflector); 9.88, 14.0 (K. Hornoch,
Lelekovice, Czech Republic, 0.35-m reflector).

                      (C) Copyright 1999 CBAT
1999 December 18               (7335)            Daniel W. E. Green

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