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IAUC 7331: P/1999 X1; 1999ge; 1999em

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                                                  Circular No. 7331
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  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)

     Gary Hug and Graham E. Bell, Eskridge, KS, report their
discovery of a comet (discovery observation given below) showing a
faint tail in p.a. 285 deg on CCD images taken with a 0.3-m
Schmidt-Cassegrain reflector on Dec. 10.  Following posting on the
NEO Confirmation Page, L. Sarounova (Ondrejov, 0.65-m reflector)
obtained observations on Dec. 11.2 UT showing a tail 20" long in
p.a. about 300 deg.  C. Hergenrother, Lunar and Planetary
Laboratory, reports that a co-added 1200-s R-band image obtained
with the 1.54-m Kuiper telescope on Dec. 11 shows a 15" coma and a
slightly curved tail > 1' long in p.a. 280 deg.

     1999 UT             R.A. (2000) Decl.        m1
     Dec. 10.33347    8 24 32.66   +20 07 54.0   18.8

All of the available astrometry (including prediscovery
observations on Oct. 10 and Dec. 7 by LINEAR), along with the
following orbital elements, appear on MPEC 1999-X24:

     T = 1999 June 20.7057 TT         Peri. = 296.8671
     e = 0.471559                     Node  = 103.6425  2000.0
     q = 1.936291 AU                  Incl. =  10.9682
       a =  3.664160 AU    n = 0.1405214    P =   7.014 years

     S. Jha, P. Challis, P. Garnavich, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum of SN
1999ge, obtained by A. Mahdavi on Dec. 7.13 UT with the F. L.
Whipple Observatory 1.5-m telescope (+ FAST spectrograph),
indicates it to be a type-II supernova at an early epoch.  The
spectrum exhibits a generally featureless and very blue continuum.
The most prominent feature is weak H-delta absorption, though
absorption from H-beta and H-gamma is also visible, as well as a
hint of a P-Cyg H-alpha profile.  Cross-correlation of the host-
galaxy spectrum with an emission-line template yields a recession
velocity of 5650 +/- 30 km/s for NGC 309.

SUPERNOVA 1999em IN NGC 1637
     CCD photometry by J. Safar and D. Hanzl, Brno, Czech Republic:
Nov. 2.051 UT, V = 13.89 +/- 0.03; 15.943, V = 13.92 +/- 0.01, B-V
= +0.75 +/- 0.2; Dec. 2.903, V = 14.00 +/- 0.05.

                      (C) Copyright 1999 CBAT
1999 December 11               (7331)            Daniel W. E. Green

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