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IAUC 6499: C/1996 Q1; 1996bo

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                                                  Circular No. 6499
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444 (for emergency use only)

     This comet began to fade rapidly around Oct. 20, and has
become increasingly less condensed as it approaches perihelion on
Nov. 3.  T. Yusa, Kogota, Japan, obtained a 100-s CCD exposure with
a 0.20-m reflector on Oct. 29.41 UT that shows a diffuse,
uncondensed, elongated image of total mag about 9.  J. E. Bortle,
Stormville, NY, reports that a visual observation on Oct. 29.99
showed an elongated "streak" aligned in p.a. 20-200 deg (with the
comet's head located toward the northeast end of the streak but
showing very little condensation).  H. Mikuz, Ljubljana, Slovenia,
reports that CCD photometry with a 0.20-m f/2 Baker-Schmidt camera
on Oct. 30.74 shows a coma of magnitude V = 8.5 and size about 13'
x 5' aligned along p.a. about 10-190 deg and a straight tail at
least 1.2 deg long on 5-min V and R exposures; the inner coma is
almost uniform without central condensation.  W. Offutt, Cloudcroft,
NM, notes that the "head" is broad and poorly defined with no
apparent condensation on four 50-s CCD frames (0.60-m reflector)
obtained under poor conditions during Oct. 31.06-31.07.  Total
visual magnitude estimates:  Oct. 13.75, 5.2 (M. Plsek, Lelekovice,
Czech Republic, 7x50 binoculars); 19.16, 5.6 (C. E. Spratt,
Victoria, BC, 11x80 binoculars); 20.23, 6.6 (A. Pereira, Cabo da
Roca, Portugal, 9x34 binoculars); 22.17, 7.6 (B. H. Granslo,
Fjellhamar, Norway, 0.20-m reflector); 23.19, 7.8 (G. Glitscher,
Darmstadt, Germany, 20x80 binoculars); 29.76, 8.1 (R. J. Bouma,
Groningen, The Netherlands, 15x80 binoculars); 29.99, 9.4 (Bortle,
0.32-m reflector); 30.80, 9.3 (Pereira, 0.25-m reflector).

     I. Sato, National Astronomical Observatory of Japan, reports
the following magnitude and precise position measured from a CCD
image obtained by H. Fukushima, N. Yamamoto, and himself at Mitaka
on Oct. 30.49 UT:  I = 16.3, R.A. = 1h48m22s.862, Decl. =
+11 31'15".13 (equinox J2000.0; correction of systematic error from
GSC to PPM system by Delta(R.A.) = +0".31 +/- 0".35 and Delta(Decl.)
= -0".79 +/- 0".25), which is 6".14 east and 1".58 south of the
galaxy's center.
     Corrigendum.  On IAUC 6497, line 24, for  Patat et al. 1996,
278,  read  Patat et al. 1996, MNRAS 278,

                      (C) Copyright 1996 CBAT
1996 October 31                (6499)            Daniel W. E. Green

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