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IAUC 3898: SN IN NGC 1365; 1983v

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IAUC number 

                                                  Circular No. 3898
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 617-864-5758


SUPERNOVA IN NGC 1365
     P. Whitelock, South African Astronomical Observatory, reports
the following infrared measurements, made on Nov. 27.8 UT: J =
14.22, H = 14.39, K = 14.3.  She also communicates the following
CCD photometric observations, obtained on Nov. 27.9 by P. Mack: V
= 14.23, B-V = +0.41, V-R = +0.13, V-I = +0.26 (Cousins system).


COMET HARTLEY-IRAS (1983v)
     The following precise positions have been reported:

    1983 UT           R.A.  (1950.0)   Decl.    m1   Observer

    Dec.  5.12153   20 56 45.36   - 0 53 43.4        Thomas
          5.13333   20 56 44.90   - 0 53 21.6          "
          8.08576   20 54 46.87   + 0 36 22.8   15   Everhart

N. G. Thomas (Lowell Observatory, Anderson Mesa Station).
   Measurer: E. Bowell.  Second position uncertain.
E. Everhart (Chamberlin Observatory field station).  0.40-m f/5
   reflector.  Poor conditions, bad seeing.

     Total visual magnitude estimate by D. W. E. Green (Harvard
College Observatory, 0.23-m refractor): Dec. 8.98 UT, 10.9.

     Further computations confirm the suggestion on IAUC 3896 that
the orbit of this comet seems to depart from a parabola.  The
short-period retrograde orbit, derived from observations covering
Nov. 4-Dec. 8, has presumably arisen from an encounter with Jupiter
at the descending node.  The revolution period  P  is uncertain; if
P ~ 28 years, the comet would have been near Jupiter in 1957.

         T = 1984 Jan. 8.927 ET
     Peri. =  47.330                    e =   0.83014
     Node  =   0.834   1950.0           a =   7.53736 AU
     Incl. =  95.678                    n =   0.047629
         q =   1.28028 AU               P =  20.7 years

     1983/84 ET  R.A. (1950.0) Decl.      p        r       m1

     Dec. 12    20 52.63    + 2 30.3    1.533    1.337    10.7
          22    20 48.95    + 7 01.9
     Jan.  1    20 47.13    +11 16.0    1.750    1.285    10.8
          11    20 46.51    +15 23.9
          21    20 46.59    +19 35.3    1.862    1.291    11.0


1983 December 9                (3898)              Brian G. Marsden

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