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IAUC 3488: 1980g

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                                                  Circular No. 3488
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


PERIODIC COMET STEPHAN-OTERMA (1980g)
     H.-E. Schuster, European Southern Observatory, reports that he
has recovered this comet as follows:

     1980 UT          R. A. (1950) Decl.    m1
     June 13.34583    1 27.57    - 8 24.8   18
          19.36979    1 37.38    - 7 43.4   18

     These positions are in good agreement with the following hitherto
unpublished predicted elements, by D. K. Yeomans, Jet Propulsion
Laboratory, based on a total of 113 observations at the 1867
and 1942-43 perihelion passages, with allowance for perturbations
by Mercury-Pluto.  For the purpose of the ephemeris computation the
correction Delta-T =  -0.07 day has been applied.

       T = 1980 Dec. 5.2244 ET    Epoch = 1980 Dec. 7.0 ET
   Peri. = 358.1619                   e =   0.859984
   Node  =  78.5122   1950.0          a =  11.244112 AU
   Incl. =  17.9810                   n =   0.0261406
       q =   1.574361 AU              P =  37.704 years

     1980 ET     R. A. (1950) Decl.     Delta     r      m2
     June 30     1 55.02    - 6 33.2    2.538   2.467   18.9
     July 10     2 11.90    - 5 31.2
          20     2 29.04    - 4 33.6    2.173   2.300   18.3
          30     2 46.41    - 3 40.4
     Aug.  9     3 03.94    - 2 51.3    1.827   2.140   17.6
          19     3 21.55    - 2 05.9
          29     3 39.11    - 1 22.8    1.509   1.989   16.9
     Sept. 8     3 56.46    - 0 39.8
          18     4 13.37    + 0 06.4    1.227   1.853   16.1
          28     4 29.59    + 1 00.9
     Oct.  8     4 44.76    + 2 10.4    0.985   1.736   15.4
          18     4 58.46    + 3 44.0
          28     5 10.28    + 5 52.8    0.790   1.647   14.7
     Nov.  7     5 19.73    + 8 48.1
          17     5 26.42    +12 38.7    0.653   1.591   14.1
          27     5 30.33    +17 24.3
     Dec.  7     5 31.77    +22 48.9    0.594   1.575   13.8

The nuclear magnitude is from m2 = 13.0 + 5 log Delta + 10 log r.  The
comet should attain total magnitude m1 = 9 in December.


1980 June 23                   (3488)              Brian G. Marsden

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