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IAUC 6694: C/1997 N1; 1997cu

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                                                  Circular No. 6694
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/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1997 N1 (TABUR)
     The following precise CCD positions have been reported:

     1997 UT             R.A. (2000) Decl.        m1    Observer
     July  4.33101    4 59 27.00   -26 29 44.3   12.5   Holvorcem
           4.33852    4 59 30.32   -26 29 34.0   12.7     "
           5.79969    5 10 18.94   -25 58 19.0          Garradd
           5.82001    5 10 27.95   -25 57 51.6            "

P. R. Holvorcem (Barao Geraldo).  0.20-m f/6.3 reflector.
G. J. Garradd (Loomberah).  0.25-m f/4.1 reflector.

     Parabolic orbital elements from 14 observations July 3-5:

     T = 1997 Aug. 15.247 TT          Peri. = 345.448
                                      Node  = 148.240   2000.0
     q = 0.38322 AU                   Incl. =  86.402

1997 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
July  1     4 35.46    -27 27.9    1.256    1.136   58.9   50.0     10.0
      6     5 11.80    -25 53.8    1.202    1.043   55.3   53.3      9.6
     11     5 49.69    -23 36.7    1.166    0.947   50.9   56.4      9.1
     16     6 27.84    -20 34.3    1.150    0.850   45.7   58.8      8.6
     21     7 04.95    -16 49.8    1.156    0.752   39.8   60.0      8.1
     26     7 40.05    -12 29.5    1.182    0.654   33.6   59.1      7.5
     31     8 12.64    - 7 39.2    1.225    0.559   26.9   55.1      6.9


SUPERNOVA 1997cu IN ANONYMOUS GALAXY
     The Mount Stromlo Abell Cluster Supernova Search Team (cf.
IAUC 6639) reports the discovery of an apparent supernova (V =
18.2, R = 18.0) on CCD images taken on July 4 by S. Sabine at the
Mount Stromlo 1.27-m telescope (+ Macho Camera).  SN 1997cu is
located near Abell 3128 at R.A. = 3h29m03s.0, Decl. = -52d41'41"
(equinox 2000.0), within 1" of its high-surface-brightness
host.  SN 1997cu was not present on similar frames taken on Feb. 25 to
R = 20.  A spectrum (range 360-750 nm) obtained on the MSSSO 2.3-m reflector
+ DBS spectrograph on July 5 reveals that SN 1997cu is of type Ia and
near maximum.  The redshift of the host galaxy, measured from several
absorption lines is z = 0.062, coincident with the redshift of Abell
3128 (z = 0.06).

                      (C) Copyright 1997 CBAT
1997 July 5                    (6694)              Brian G. Marsden

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