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IAUC 6672: 1997co; C/1997 J1

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                                                 Circular No. 6672
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)
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Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVA 1997co IN NGC 5125
     The Beijing Astronomical Observatory (BAO) Supernova Survey
(cf. IAUC 6612, plus D.-w. Lu) reports the discovery of a supernova
(mag about 18.2) on an unfiltered CCD frame taken on May 29.7 UT
with the BAO 0.6-m reflector, with a confirming image obtained
under poor weather conditions on May 31.  SN 1997co is located at
R.A. = 13h24m01s.18, Decl. = +9o42'22".9 (equinox 2000.0), which is
6".8 east and 14".5 south of the nucleus of NGC 5125.  Unfiltered
CCD images of the same field taken on May 16 (limiting mag about
19.0) show no star at this position.  S. Nakano, Sumoto, Japan,
forwards the following position end figures and magnitude from M.
Aoki, Tsukioka, Toyama (0.43-m f/6 reflector + CCD; limiting mag
18.5), obtained on May 31.502:  01s.15, 23".2, V = 17.0.
     L. Wang and J. C. Wheeler, University of Texas; and P. O.
Shull, Oklahoma State University, write:  "A low-resolution, low-
signal-to-noise spectrogram of SN 1997co was obtained on May 31.2
UT with the 2.7-m telescope (+ LCS) at McDonald Observatory,
showing this to be a type-II supernova with a conspicuous H-alpha
P-Cyg profile.  The expansion velocity measured at the minimum of
the absorption trough is about 5000 km/s."


COMET C/1997 J1 (MUELLER)
     Extension to ephemeris on IAUC 6644 (elements MPC 29880):

1997 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
June  1     9 26.80   +62 40.3   2.611   2.326   62.6   22.8   12.8
      6     9 21.51   +60 32.7   2.693   2.335   58.8   21.8   12.8
     11     9 18.00   +58 33.2   2.774   2.345   55.0   20.8   12.9
     16     9 15.81   +56 41.7   2.852   2.356   51.4   19.7   13.0
     21     9 14.59   +54 57.7   2.928   2.369   47.8   18.5   13.1
     26     9 14.11   +53 20.8   3.000   2.382   44.4   17.4   13.2
July  1     9 14.18   +51 50.5   3.068   2.397   41.1   16.2   13.2
      6     9 14.69   +50 26.3   3.132   2.413   38.0   15.0   13.3
     11     9 15.52   +49 07.8   3.190   2.431   35.2   13.9   13.4
     16     9 16.59   +47 54.6   3.243   2.449   32.7   12.9   13.4
     21     9 17.83   +46 46.2   3.290   2.469   30.5   12.1   13.5

     Total visual magnitude estimates:  May 13.02 UT, 13.2 (R. J.
Bouma, Groningen, The Netherlands, 0.25-m reflector); 25.88, 12.6
(K. Hornoch, Lelekovice, Czech Republic, 0.35-m reflector); 28.11,
12.5 (J. E. Bortle, Stormville, NY, 0.41-m reflector).

                      (C) Copyright 1997 CBAT
1997 May 31                    (6672)            Daniel W. E. Green

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