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IAUC 4003: 1984r; SN IN NGC 991

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IAUC number 

                                                  Circular No. 4003
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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


COMET SHOEMAKER (1984r)
     Carolyn and Eugene Shoemaker report their discovery of another
comet on exposures with the 0.46-m Schmidt at Palomar.  The
object is diffuse with only a weak condensation; no tail.

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

      Oct. 23.45625      3 24 53.28     +18 32 02.9     16
           25.44722      3 22 11.80     +18 21 55.1
           26.38889      3 20 54.89     +18 16 59.4

     The comet is moving essentially along the ecliptic, and with
a departure from great-circle motion of only 1"8 the orbit is very
indeterminate.  Two extreme possibilities follow.  The ephemeris
is from the ellipse.  The parabola yields rather similar positions
but very different distances.

         T = 1984 May 30.46 ET      T = 1984 July 19.87 ET
     Peri. = 173.23             Peri. = 134.73
     Node  = 238.65   1950.0    Node  = 188.45   1950.0
     Incl. = 179.27             Incl. =   0.12
         q =   5.3910 AU            q =   1.1471 AU
         e =   1.0                  e =   0.6327

     1984 ET     R.A. (1950.0) Decl.      p        r       m1

     Oct. 27     3 20.08    +18 13.8    0.681    1.653    16.3
     Nov.  1     3 13.21    +17 47.0
           6     3 06.55    +17 20.1    0.742    1.731    16.7
          11     3 00.34    +16 54.2
          16     2 54.81    +16 30.6    0.825    1.810    17.2


SUPERNOVA IN NGC 991
     J. R. Graham, Imperial College, London, telexes: "UKIRT service
observations by T. Geballe on behalf of W. P. S. Meikle, J. R.
Graham, P. L. Andrews, A. J. Longmore, P. M. Williams and D. A.
Allen on Oct. 15.5 UT yield the following infrared magnitudes: J =
13.70, H = 13.46, K =13.45.  The object has been designated as
both type I (IAUC 3981) and type II (IAUC 3983).  The blue H-K
color is atypical of type II but similar to the colors of type I
supernovae reported by Elias et al. (1981, Ap.J. 251, L13).
Further optical spectroscopy is urgently required to identify the
nature of this supernova."


1984 November 1                (4003)              Brian G. Marsden

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