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IAUC 7170: C/1999 J4; 1999ce

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                                                  Circular No. 7170
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)


COMET C/1999 J4 (LINEAR)
     An asteroidal object reported by LINEAR on May 15.3 UT (mag
18.2-18.8) with unusual motion was noted on The NEO Confirmation
Page, and it has subsequently been reported to be cometary in
appearance by several observers, including now M. Elowitz and F.
Shelly from May 17 LINEAR observations.  P. Pravec, U. Babiakova,
and P. Kusnirak (Ondrejov, 0.65-m f/3.6 reflector + V filter)
reported a coma diameter of 0'.2 and a tail 0'.6 long in p.a. 160
deg, and J. Ticha and M. Tichy (Klet, 0.57-m f/5.2 reflector) noted
the object to be slightly diffuse (coma diameter about 7"), on May
16.9.  The discovery observation is given below; additional
astrometry (May 15-17) appears on MPEC 1999-K06.

     1999 UT             R.A. (2000) Decl.        m2
     May  15.31791   15 51 26.96   +45 12 11.2   18.3

     Preliminary parabolic orbital elements by B. G. Marsden:

     T = 1999 Oct. 28.036 TT          Peri. =  90.878
                                      Node  = 264.309   2000.0
     q = 3.86165 AU                   Incl. = 118.822

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m2
May  12    15 57.95   +44 25.5   3.578   4.132  116.8   12.6   18.1
     22    15 37.86   +46 33.0   3.598   4.103  113.1   13.1   18.1
June  1    15 16.99   +47 59.8   3.646   4.074  107.9   13.7   18.1
     11    14 56.71   +48 46.7   3.716   4.047  101.8   14.2   18.2
     21    14 38.24   +48 58.5   3.801   4.022   95.2   14.6   18.2
July  1    14 22.41   +48 42.8   3.897   3.999   88.3   14.7   18.3
     11    14 09.59   +48 07.7   3.997   3.977   81.6   14.6   18.3
     21    13 59.83   +47 20.8   4.096   3.957   75.0   14.4   18.4


SUPERNOVA 1999ce IN ANONYMOUS GALAXY
     M. Papenkova and W. D. Li, University of California at
Berkeley, on behalf of the Lick Observatory Supernova Search (cf.
IAUC 6627, 7126), report their discovery of an apparent supernova
on an unfiltered image taken on May 16.2 UT (mag about 18.3) with
the 0.8-m Katzman Automatic Imaging Telescope (KAIT), the object
being confirmed on an earlier image taken on May 10.2 (mag about
18.8).  SN 1999ce is located at R.A. = 11h28m51s.57, Decl. =
+57o08'04".0 (equinox 2000.0), which is about 1".5 southeast of the
nucleus of the host galaxy.  KAIT images of the same field taken on
May 1.3 (limiting mag about 19.0), Apr. 26.4 (limiting mag about
19.0) and Jan. 11.5 (limiting mag about 19.3) show nothing at the
position of the new star.

                      (C) Copyright 1999 CBAT
1999 May 17                    (7170)            Daniel W. E. Green

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