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IAUC 7344: C/1999 XS_87; 1999et; SNe

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                                                  Circular No. 7344
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 XS_87 (LINEAR)
     An object that was assumed to be asteroidal was found by
LINEAR on 1999 Dec. 7 and 8 (discovery observation given below; see
also MPS 8038), and it was later linked to observations by LINEAR
on 2000 Jan. 6 and 7 by G. V. Williams, Minor Planet Center.
Following a request from the Minor Planet Center after seeing that
the orbit appeared cometlike, M. Tichy and Z. Moravec obtained
observations at Klet on Jan. 11 and 12 that showed this object to
be diffuse with a coma diameter of 15".

     1999 UT             R.A. (2000) Decl.        m2
     Dec.  7.37830    6 40 43.95   +21 14 14.5   17.3

     Full astrometry and orbital elements appear on MPEC 2000-A43.

     T = 1999 Aug.  6.5518 TT         Peri. = 151.3264
     e = 0.840979                     Node  = 266.7267  2000.0
     q = 2.771006 AU                  Incl. =  14.8424
       a = 17.425430 AU    n = 0.0135497    P =  72.740 years


SUPERNOVA 1999et IN NGC 1643
     H. Yamaoka, Kyushu University; and M. Yamamoto, Ayabe
Astronomical Observatory (AAO), report a precise position for SN
1999et (cf. IAUC 7304), from images taken with the 0.95-m AAO
reflector:  R.A. = 4h43m43s.53, Decl. = -5o19'19".8 (equinox
2000.0).  During Nov. 10-Dec. 8, the supernova remained at R = 17.1
+/- 0.1.  A foreground star (R about 16.0) superposed on the bulge
of the host galaxy has position end figures 43s.70, 03".2.


SUPERNOVAE
     CCD magnitudes (unfiltered unless otherwise noted) by L. Kiss,
K. Sarneczky, and K. Sziladi, at Piszkesteto, Hungary:
SN 1999el in NGC 6951, 1999 Dec. 31.786 UT, 16.4 +/- 0.1.
SN 1999em in NGC 1637, Dec. 31.870, 14.6 +/- 0.2.
SN 1999ev in NGC 4274, Dec. 31.207, R = 18.2 +/- 0.4.
SN 1999ew in NGC 3677, Dec. 31.178, R = 17.7 +/- 0.3.
SN 1999fz in UGC 8164, Dec. 31.200, R = 17.9 +/- 0.3.
SN 1999gb in NGC 2532, Dec. 31.213, R = 16.8 +/- 0.2.
SN 1999gd in NGC 2623, Dec. 31.219, R = 17.5 +/- 0.3.
SN 1999gi in NGC 3184, Dec. 31.172, R = 14.6 +/- 0.1.
SN 1999gl in NGC 317B, Dec. 31.792, 17.8 +/- 0.3.
SN 1999go in NGC 1376, Dec. 31.886, 16.6 +/- 0.1.
SN 1999gp in UGC 1993, Dec. 29.693, R = 16.7 +/- 0.2.

                      (C) Copyright 2000 CBAT
2000 January 12                (7344)            Daniel W. E. Green

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