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IAUC 7045: C/1998 U5; 1998en

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                                                 Circular No. 7045
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
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1998 U5 (LINEAR)
     Preliminary parabolic orbital elements from 44 observations
(all of which appear on MPEC 1998-V03), spanning Oct. 30-Nov. 2:

     T = 1998 Dec. 21.774 TT          Peri. =  51.448
                                      Node  =  66.661   2000.0
     q = 1.23192 AU                   Incl. = 131.999

1998 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Oct. 30     6 54.92   +28 28.5   0.753   1.471  114.2   38.0   12.1
Nov.  1     6 47.02   +31 16.8   0.697   1.455  117.9   37.1   11.8
      3     6 36.84   +34 31.2   0.643   1.440  121.9   35.8   11.6
      5     6 23.50   +38 14.8   0.593   1.425  126.1   34.2   11.4
      7     6 05.66   +42 28.2   0.548   1.410  130.4   32.4   11.2
      9     5 41.27   +47 06.9   0.509   1.396  134.4   30.5   11.0
     11     5 07.37   +51 55.8   0.478   1.382  137.7   28.8   10.8
     13     4 20.30   +56 21.9   0.456   1.368  139.4   28.1   10.7
     15     3 18.12   +59 31.9   0.444   1.355  138.8   28.7   10.6
     17     2 05.92   +60 29.7   0.443   1.343  135.9   30.8   10.5
     19     0 56.74   +59 00.1   0.454   1.331  131.0   34.1   10.5
     21     0 00.92   +55 43.9   0.475   1.320  125.2   37.7   10.6
     23    23 19.85   +51 38.9   0.505   1.309  119.1   41.2   10.7

     Total visual magnitude and coma-diameter estimates:  Nov. 1.18
UT, 12.3, 1'.3 (J. D. Shanklin, Cambridge, England, 0.30-m
refractor); Nov. 1.51, 12.2, 2' (A. Hale, Cloudcroft, NM, 0.41-m
reflector; poor conditions).


SUPERNOVA 1998en IN UGC 3645
     W. D. Li, M. Modjaz, E. Halderson, T. Shefler, J. Y. King, M.
Papenkova, R. R. Treffers, and A. V. Filippenko, University of
California at Berkeley, report the discovery of an apparent
supernova in the course of the Lick Observatory Supernova Search
with the 0.8-m Katzman Automatic Imaging Telescope (KAIT).  SN
1998en was discovered on unfiltered frames taken on Oct. 30.5 (mag
about 18.4) and 31.5 UT (mag about 18.2).  The new object is
located at R.A. = 7h04m00s.05, Decl. = +50o40'30".0 (equinox
2000.0), which is about 10".4 west and 18".3 south of the nucleus
of UGC 3645.  KAIT images of the same field on Oct. 26.5 (limiting
mag about 18.5) and Oct. 21.5 (limiting mag about 19.0) showed
nothing at the position of the supernova.

                      (C) Copyright 1998 CBAT
1998 November 2                (7045)            Daniel W. E. Green

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