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IAUC 7298: C/1999 U4; 1999ej

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                                                  Circular No. 7298
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 U4 (CATALINA-SKIFF)
    Yesterday T. B. Spahr, Lunar and Planetary Laboratory, reported
the discovery by the Catalina Sky Survey of a slow-moving object
that was independently discovered today by B. A. Skiff (measurer B.
W. Koehn) by the LONEOS survey.  In response to Skiff's alert, R.
L. Millis and L. H. Wasserman, on a 5-min R-band exposure with the
Perkins 1.8-m reflector, detected a coma extending 8" southeastward
from the nucleus.  After a posting in The NEO Confirmation Page, M.
Tichy and Z. Moravec, Klet, also reported that the object had an 8"
coma.  The discovery observations follow, with very preliminary
parabolic elements and an ephemeris from MPEC 1999-V04.

     T = 2001 Sept.14.404 TT          Peri. =  77.087
                                      Node  =  31.540   2000.0
     q = 4.77674 AU                   Incl. =  47.304

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Oct. 29     2 10.01   +20 14.5   6.065   7.052  173.0    1.0   16.9
Nov.  3     2 07.32   +20 17.6   6.042   7.026  172.2    1.1   16.9
      8     2 04.64   +20 20.2   6.027   7.000  168.4    1.6   16.9
     13     2 02.01   +20 22.4   6.020   6.974  163.5    2.3   16.8
     18     1 59.45   +20 24.3   6.020   6.949  158.3    3.0   16.8


SUPERNOVA 1999ej IN NGC 495
     S. Jha, P. Challis, P. Garnavich, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum
obtained by M. Calkins with the F. L. Whipple Observatory 1.5-m
telescope (+ FAST spectrograph) on Oct. 30.27 UT shows SN 1999ej to
be a normal type-Ia supernova near maximum light.  Adopting the NED
recession velocity for NGC 945 of 4414 km/s yields expansion
velocities for Si II (rest 635.5 nm) and Ca II (H+K) of 10 500 km/s
and 15 700 km/s, respectively.  The estimated age of the supernova
based on the observed spectral features (Riess et al. 1998, Ap.J.
504, 935) is 1.5 +/- 3 days before maximum light.

                      (C) Copyright 1999 CBAT
1999 November 1                (7298)            Daniel W. E. Green

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