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IAUC 7050: 1998es; P/1998 U3; C/1998 U5

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                                                 Circular No. 7050
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)

     E. Halderson, M. Modjaz, T. Shefler, J. Y. King, M. Papenkova,
W. D. Li, R. R. Treffers, and A. V. Filippenko, University of
California at Berkeley, report their discovery of an apparent
supernova in NGC 632 during the course of the Lick Observatory
Supernova Search (cf. IAUC 6627) with the 0.8-m Katzman Automatic
Imaging Telescope (KAIT).  SN 1998es was discovered and confirmed
on unfiltered observations taken on Nov. 13.3 (mag about 14.6) and
14.4 UT (mag about 14.3).  The new object is located at R.A. =
1h37m17s.50, Decl. = +5o52'50".3 (equinox 2000.0), which is about
11".4 north of the nucleus of NGC 632.  KAIT images of the same
field taken on Oct. 24.3 (limiting mag about 16.0) and Oct 21.3
(limiting mag about 19.5) showed nothing at the position of the
     S. Nakano, Sumoto, Japan, reports the following position end
figures and magnitude measured by M. Aoki, Toyama, from a CCD image
taken on Nov. 14.387 UT:  17s.47, 50".3, V = 14.5.  Aoki adds that
a star of mag 15 is located 10" northeast of SN 1998es.  Nakano
also forwards the following CCD position end figures and unfiltered
magnitude for SN 1998es from R. and Y. Kushida, Yatsugatake South
Base Observatory (0.40-m f/6.4 Schmidt-Cassegrain reflector) on
Nov. 14.510:  17s.48, 50".2, 14.5; the offset from the galaxy
center is 0".4 west and 10".8 north.  R. Kushida adds that there is
no star around the discovery position on her two previous frames of
this galaxy taken on 1997 Oct. 10 and Nov. 11.

     Orbital elements from MPC 32866:

     T = 1999 Mar.  7.7714 TT         Peri. = 179.4942
     e = 0.652672                     Node  = 303.8178  2000.0
     q = 2.152631 AU                  Incl. =  19.0944
       a =  6.197683 AU    n = 0.0638793    P =  15.4 years

     Visual m_1 and coma-diameter estimates:  Nov. 12.07 UT, 8.7,
7' (J. Bortle, Stormville, NY, 20x80 binoculars); 12.67, 8.3, 5'
(T. Seki, Geisei, Japan, 0.20-m refractor); 13.04, 8.2, 9'
(Bortle); 14.07, 7.8, 13' (Bortle, 10x50 binoculars).

                      (C) Copyright 1998 CBAT
1998 November 14               (7050)            Daniel W. E. Green

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