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IAUC 4461: 1986k; QU Vul (N Vul 1984 No. 2)

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                                                  Circular No. 4461
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


PERIODIC COMET KOHOUTEK (1986k)
     The following are the only observations reported this year:

   1987 UT            R.A. (1950) Decl.         m1    Observer
   July 25.76319    4 08 29.1    +24 51 58     18.5   Seki
   Sept.27.43311    6 52 07.36   +25 11 42.9   17.1   Scotti

T. Seki (Geisei).  0.6-m reflector.  Uncertain.
J. Scotti (Kitt Peak).  SPACEWATCH camera.  Tail to west.
     These observations are mutually consistent but indicate a
substantial departure from the orbit on IAUC 4240 (ephemeris MPC
11648) on account of unusual nongravitational activity.  The
following result is based on observations during 1986-1987 only:

         T = 1987 Oct. 30.0913 ET    Epoch = 1987 Oct. 12.0 ET
         W = 175.7640                   e =   0.497835
         O = 268.9776   1950.0           a =   3.535149 AU
         i =   5.9159                    n =   0.1482834
         q =   1.775228 AU               P =   6.647 years

     1987/88 ET   R.A. (1950) Decl.     Delta      r       m1
     Oct.  2     7 03.07    +24 45.3
          12     7 26.04    +23 36.6    1.513    1.783    17.9
          22     7 47.27    +22 15.0
     Nov.  1     8 06.35    +20 44.1    1.338    1.775    17.6
          11     8 22.91    +19 07.5
          21     8 36.51    +17 29.5    1.181    1.786    17.3
     Dec.  1     8 46.72    +15 54.6
          11     8 53.20    +14 27.3    1.051    1.815    16.9
          21     8 55.69    +13 11.8
          31     8 54.22    +12 11.9    0.966    1.861    16.6
     Jan. 10     8 49.35    +11 29.5
          20     8 42.14    +11 04.9    0.951    1.922    16.3
          30     8 34.13    +10 55.6
     Feb.  9     8 26.99    +10 57.4    1.025    1.994    16.5


QU VULPECULAE (NOVA VULPECULAE 1984 No. 2)
     Visual magnitude estimates: Sept. 14.8 UT, 12.7 (A. Mizser,
Budapest, Hungary); 16.02, 12.3 (P. Schmeer, Bischmisheim, West
Germany); 29.98, 12.3 (Schmeer); 30.96, 12.4 (Schmeer).


1987 October 3                 (4461)              Brian G. Marsden

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