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IAUC 3847: 1983k; Var STAR IN Ara

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IAUC number 

                                                  Circular No. 3847
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


COMET IRAS (1983k)
     K. S. Russell, U.K. Schmidt Telescope Unit, reports the
following observations made at Siding Spring.  He notes that there is
no apparent dimming of the comet's image from July 14 to 19.  The
image from the first plate was fairly close to the plate edge.

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

     July 14.34529      11 58 46.41      -47 18 46.4      18
          14.35918      11 58 46.58      -47 18 23.5
          19.38090      12 00 55.99      -44 38 03.4

     The following parabolic elements, by B. G. Marsden, use the
above observations and the approximate positions from the Infrared
Astronomical Satellite.  Further precise positions are urgently
needed.

           T = 1983 Apr. 28.65 ET  Peri. = 263.11
                                   Node  = 170.41   1950.0
           q =   2.3865 AU         Incl. = 139.11

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

     July  5    11 56.18    -53 12.7    2.110    2.501    17.6
          15    11 59.04    -46 56.8
          25    12 03.76    -42 00.8    2.518    2.575    18.1
     Aug.  4    12 09.47    -38 10.7
          14    12 15.76    -35 13.3    2.957    2.664    18.6
          24    12 22.35    -32 57.3
     Sept. 3    12 29.07    -31 13.4    3.361    2.766    19.1
          13    12 35.80    -29 54.8
          23    12 42.43    -28 55.8    3.689    2.880    19.4


VARIABLE STAR IN ARA
     M. H. Liller, Center for Astrophysics, reports that examination
of 156 patrol plates, taken 1928-1951, shows this to be a variable
with a period ~ 479 days.  From a rough sequence from the
ESO Quick Blue Survey, the maximum and minimum blue magnitudes are
~ 12.0 and ~ 17.  Two pairs of nearly simultaneous observations
with the red and blue Damon patrol cameras at Mt. John Observatory
in 1982 indicate that the variable (cf. IAUC 3844) is much
redder than any of the comparison stars.


1983 July 29                   (3847)            Daniel W. E. Green

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