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IAUC 6883: 1998 H1

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                                                 Circular No. 6883
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 1998 H1
     On Apr. 22, the Central Bureau received a report from Patrick
L. Stonehouse of an apparent visual comet discovery, with motion
stated to the north (later to the northwest), and the object was
described as diffuse with slight condensation.  Poor initial
positions evidently caused attempts at confirming the comet over
several square degrees with CCDs by T. Kojima (Chiyoda) and M.
Tichy (Klet) on Apr. 22-23 UT, and by H. Mikuz and J. Skvarc (Crni
Vrh) on Apr. 25, to be unsuccessful.  Continuing observations by
Stonehouse encouraged the Bureau to issue refined search
ephemerides, resulting in confirmation as indicated below
(observations from Japanese observers were communicated by S.
Nakano, Sumoto):

     1998 UT             R.A. (2000) Decl.        m1    Observer
     Apr. 22.25      15 54.6       + 0 21        12     Stonehouse
          23.016     15 51.2       + 2 15        13       "
          24.229     15 44.0       + 5 20                 "
          25.0       15 36.4       + 8 03                 "
          26.265     15 30.1       +10 44        10.7   Hale
          26.53337   15 28 43.45   +11 30 16.3          Garradd
          26.53461   15 28 42.94   +11 30 28.0            "
          26.53586   15 28 42.44   +11 30 39.7            "
          26.53756   15 28 41.76   +11 30 55.8            "
          26.53865   15 28 41.30   +11 31 06.0            "
          26.61007   15 28 12.87   +11 42 01.5   11.5   Nakamura
          26.61215   15 28 12.04   +11 42 21.4            "
          26.61424   15 28 11.19   +11 42 41.0            "
          26.67567   15 27 46.45   +11 52 18.0   12.4   Ikari
          26.67660   15 27 45.79   +11 52 43.1          Garradd
          26.67763   15 27 45.42   +11 52 53.4            "
          26.68012   15 27 44.64   +11 53 00.2          Ikari

P. L. Stonehouse (Wolverine, MI).  0.44-m reflector.
A. Hale (Cloudcroft, NM).  Visual observation with 0.41-m reflector.
  Coma diameter 4'.5; comet diffuse with condensation; motion
  northwest.
G. J. Garradd (Loomberah).  0.25-m f/4.1 reflector + CCD.  Tail 30"
  long in p.a. 155 deg on short CCD exposures; m_2 = 14.8-15.4.
A. Nakamura (Kuma).  Communicated by S. Nakano.  0.60-m f/6
  reflector + CCD.  Tail > 5' long in p.a. 202 deg, extends out of
  CCD field.
Y. Ikari (Moriyama).  0.25-m f/6.3 reflector + CCD.

                      (C) Copyright 1998 CBAT
1998 April 26                  (6883)            Daniel W. E. Green

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