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IAUC 4950: 1990a; 1990C; N IN NGC 1313

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                                                  Circular No. 4950
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505

COMET WILD (1990a)
     Paul Wild, Astronomical Institute, Berne University, reports his
discovery of a comet at the following positions measured by U. Hugentobler:

     1990 UT             R.A. (1950) Decl.           m1
     Jan. 21.98333    9 34 31.69   +20 39 39.5   13.5-14.0
          22.89236    9 33 56.70   +20 43 03.4

The object is strongly condensed, with a fanshaped tail extending
about 1' to the northwest.

     C. Pollas, Observatoire de la Cote d'Azur, reports his discovery
of a possible faint supernova in a faint possibly interacting system or
S0 galaxy with a jetlike protrusion.  The supernova, of mag 19.5 on an
unfiltered IIIa-J plate obtained on Jan. 20.97 UT, is located at R.A. =
8h01m26s.02, Decl. = +22d52'25".8 (equinox 1950.0), 0".2 west and 1".9
north of the compact image of the galaxy.  The position of the central
part of the elongated component of the system (which is blue on the
Palomar Sky Survey prints) has end figures 25s.32, 26".4, and there is
a red star of mag 18 at end figures 25s.25, 16".9.  A red plate
obtained on Jan. 23.0 confirms the object at R about 19.

     M. A. Dopita and  S. D. Ryder, Mount Stromlo and Siding Spring
Observatories, report: "A nova has been discovered in the outer parts
of NGC 1313 at R.A. = 3h17m02s.6, Decl. = -66d43'57" (equinox 1950.0).
It appears to be well into its nebular phase, was only weakly visible
on a V-band CCD image taken on 1989 Dec. 28.48 UT but appeared bright
on an H alpha CCD image taken on Dec. 26.47 UT.  A spectrum was
obtained on 1990 Jan. 23.55 UT using the Double Beam Spectrograph on
the 2.3-m telescope at Siding Spring.  This shows a very weak blue
continuum, with the Balmer lines strongly in emission, He II 468.6 nm
being at about 10 percent the intensity of H beta.  [Ne III], [O III]
and [N II] are also seen.  The ratio of the 436.3-nm line to the
500.7-nm line of [O III] is about 1:3, indicating an electron density
of 3-10 x 10**6 cm-3.  The H alpha line has a flux of about 10**-13
erg cm-2 s-1 and is 750 km/s wide FWZM."

1990 January 23                (4950)              Brian G. Marsden

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