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IAUC 3024: P/VAN BIESBROECK; V1500 Cyg

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                                                  Circular No. 3024
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK     Telex: 921428
Telephone: (617) 864-5758


PERIODIC COMET VAN BIESBROECK
     The following prediction, by B. G. Marsden, is based on
observations during 1954-55 and 1965-66.  Perturbations by all nine
planets were taken into account

       T = 1978 Dec. 3.0287 ET    Epoch = 1978 Nov. 28.0 ET
   Peri. = 134.2519                   e =   0.552513
   Node  = 148.5782   1950.0          a =   5.353169 AU
   Incl. =   6.6186                   n =   0.0795770
       q =   2.395473 AU              P =  12.39 years
                                                        For dT = +1d
     1977 ET     R. A. (1950) Decl.     Delta     r     dR.A.  dDecl.   m2
     Feb.  6    11 27.04    + 5 51.8    4.214   5.066   -0m36  + 1'7   20.3
          16    11 22.98    + 6 27.2                    -0.37  + 1.7
          26    11 18.07    + 7 07.3    4.003   4.979   -0.37  + 1.7   20.1
     Mar.  8    11 12.63    + 7 49.5                    -0.37  + 1.6
          18    11 07.04    + 8 31.2    3.915   4.891   -0.37  + 1.6   20.0
          28    11 01.71    + 9 09.8                    -0.36  + 1.5
     Apr.  7    10 57.02    + 9 42.7    3.947   4.801   -0.36  + 1.4   20.1
          17    10 53.29    +10 08.3                    -0.35  + 1.3
          27    10 50.74    +10 25.6    4.076   4.711   -0.34  + 1.3   20.2
     May   7    10 49.52    +10 34.0                    -0.33  + 1.2
          17    10 49.66    +10 33.5    4.267   4.619   -0.32  + 1.2   20.3
          27    10 51.16    +10 24.5                    -0.31  + 1.2
     June  6    10 53.94    +10 07.6    4.480   4.526   -0.30  + 1.2   20.4
          16    10 57.91    + 9 43.3                    -0.30  + 1.2
          26    11 02.97    + 9 12.2    4.686   4.433   -0.30  + 1.2   20.5
     July  6    11 09.01    + 8 35.1                    -0.30  + 1.2
          16    11 15.90    + 7 52.5    4.859   4.338   -0.30  + 1.3   20.4
          26    11 23.57    + 7 05.0                    -0.30  + 1.3
     Aug.  5    11 31.90    + 6 13.3    4.981   4.242   -0.31  + 1.4   20.4

        m2 = 13.5 + 5 log Delta + 5 log r + 0.03 (phase angle)


V1500 CYGNI
     Recent visual magnitude estimates: Nov. 9.00 UT, 11.8 (S.
O'Meara, Harvard College Observatory); 27.99, 12.0 (O'Meara); Dec.
14.04, 12.3 (J. Bortle, Brooks Observatory); 19.99, 12.3 (Bortle).


1976 December 30               (3024)              Brian G. Marsden

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