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IAUC 3964: N Vul 1984; 1984j; 1984i

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                                                  Circular No. 3964
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444

     R. Argyle, Royal Greenwich Observatory, provides the following
precise position, obtained on July 29.95 UT, the object being
of mpg = 8.8: R.A. = 19h24m03s44, Decl. = +27deg15'54" 4 (equinox 1950.0).
C.-Y. Shao, Center for Astrophysics, informs us that his examination
of the Palomar Sky Survey prints shows a blue star of mag ~
17 in a close optical double (or triple) system that may be the
prenova; there is no other star brighter than mpg = 15 within 0'5
of the nova's position.  Visual magnitude estimates: July 30.23 UT,
8.8 (C. S. Morris, Tujunga, CA); 31.13, 8.4 (D. Weier, Madison,
WI); 31.52, 8.2 (R. H. McNaught, Siding Spring Observatory).

     A telex from Y. Kozai, Tokyo Astronomical Observatory, reported
the discovery by Takamizawa of a possible comet of diameter
2' and moving southward.  A further telex contained a confirmatory
observation the following night by Saito, who described the comet
as diffuse with condensation but no tail.  Confirmation has also
been received from C. S. Morris and A. Hale at Whitaker Peak, CA,
who made the following magnitude estimates: Aug. 1.41 UT, 9.5
(Morris, 0.25-m reflector); 1.43, 9.3 (Hale, 0.20-m reflector).
Morris adds that the comet is extremely condensed, of diameter
1'-2' with a tail 4'-5' long to the west.  Positions follow:

       1984 UT       R.A. (1950.0) Decl.    m1    Observer

       July 30.528    21 12      -18 40     10    Takamizawa
            31.679    21 12.2    -18 56     10    Saito
       Aug.  1.410    21 11.7    -19 12           Morris

     B. H. Foing, European Southern Observatory, reports: "We have
observed comet 1984i on July 25.97 (0.50-m reflector and Stromgren
photometer) and July 27.96 UT (1.5-m reflector and spectrograph
covering the range 500-730 nm).  We find a central diffuse condensation
of FWHM 25" in the Stromgren channels.  The C2 and NH2 spectral
bands present a similar extension.  No solar-antisolar asymmetry
is apparent; integrated magnitude is equivalent to V = 6.3."

1984 August 1                  (3964)              Brian G. Marsden

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