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IAUC 3997: 1984q; 1984c; N Sgr 1984; SN IN NGC 1559

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IAUC number

                                                  Circular No. 3997
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

     Carolyn S. and Eugene M. Shoemaker report their discovery of
another comet on 0.46-m Palomar Schmidt films as follows:

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

      Sept.27.22916     23 15 19.40     +16 59 20.0     13
           28.29444     23 13 56.49     +17 11 42.3

The object is condensed, has a considerable coma but no tail.

     E. Barker, McDonald Observatory, reports that spectroscopic
observations on Sept. 18 and 21 using the 2.7-m reflector and
image-dissector scanner showed only a reflected solar continuum at
the center of the central condensation.  A fan extends for some
12" to the southeast.  Spectra taken on the fan region at 7" from
the center of the condensation showed CN and C3 emissions.  The
strong solar continuum probably masks these emissions in the
spectra of the central condensation.

     Total visual magnitude estimate: Sept. 23.23 UT, 13.2 (C. S.
Morris, Lockwood Valley, CA, 0.25-m reflector).

     E. Belserene informs us that the Maria Mitchell Observatory
has a prediscovery image of this object at   mpg  =  13.1 on  Sept.
22.003 UT.   The measured position is R.A. = 17h50m31s25 +/- 0s17,
Decl. = -29deg01'33"9 +/- 2"0 (equinox 1950.0).  An exposure on Sept.
18.024 UT does not show the object, which must therefore have been
fainter than mag 14.5.

     C. Gry and W. Wamsteker, IUE Satellite Tracking Station, Madrid;
and N. Panagia, Space Telescope Science Institute, Baltimore,
telex: "The ultraviolet short-wavelength spectrum obtained on Aug.
13.76 UT with the International Ultraviolet Explorer shows emission
lines like those of type-II supernovae previously observed in
the ultraviolet, supporting the suggestion (IAUC 3980) that this
object is a type-II supernova considerably past maximum."

1984 October 4                 (3997)              Brian G. Marsden

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