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IAUC 6532: 1997 A1; N Cru 1996; 1997A

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                                                  Circular No. 6532
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)


COMET 1997 A1
     E. F. Helin, Jet Propulsion Laboratory, on behalf of the
Near-Earth-Asteroid Tracking Team (cf. IAUC 6341), reports the
discovery of a comet on images obtained by the on-site USAF/Ground-based
Electro-Optical Deep Space Surveillance Team in Hawaii.  Available
precise positions:

     1997 UT             R.A. (2000) Decl.        m1    Observer
     Jan. 10.51495    9 39 18.96   +16 26 18.9   18.6   Helin
          10.52334    9 39 17.97   +16 26 28.9   18.8     "
          10.53174    9 39 17.04   +16 26 38.6   18.9     "
          11.33935    9 37 46.18   +16 42 31.0   18.9   Rabinowitz
          11.34959    9 37 45.11   +16 42 43.9            "

E. F. Helin, K. J. Lawrence and S. Pravdo (Haleakala-NEAT/GEODSS).  1-m
   f/2.2 Ritchey-Chretien + CCD.  Images clearly diffuse.
D. L. Rabinowitz (Table Mountain Observatory).  0.6-m reflector + CCD.
   Near limiting magnitude of exposure.  15" coma, extending
   asymmetrically to the south.


NOVA CRUCIS 1996
     M. Della Valle, Universita di Padova; and S. Benetti, European
Southern Observatory, report: "Analysis of a fully-reduced spectrum
(range 375-690 nm, resolution about 1.6 nm) obtained on Jan. 10.3 UT with
the ESO 3.6-m telescope + EFOSC1 confirms this object (cf. IAUC 6463,
6466, 6468) to be a galactic nova caught during the nebular phase.  The
spectrum is dominated by the Balmer emission lines, [O III] 500.7 and
495.9 nm, He II 468.6 nm and [Ne III] 386.9 and 396.8 nm.  In particular,
we note that the He II emission line is almost four times stronger than
H beta, suggesting that this nova belongs to the He/N class (Williams 1992,
A.J. 104, 725).  The expansion velocity provided by the FWHM of H alpha
and H beta is about 2000 km/s."


SUPERNOVA 1997A IN ANONYMOUS GALAXY
     Benetti and Della Valle also report: "Analysis of a spectrum
obtained as above on Jan. 10.2 UT shows that supernova 1997A (cf. IAUC
6531) resembles the type Ia supernova 1994D (cf. IAUC 5946, etc.) some
7-10 days past maximum.  The spectrum exhibits strong Fe II and fading
S II lines."

                      (C) Copyright 1997 CBAT
1997 January 11                (6532)              Brian G. Marsden

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