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IAUC 3919: 1984 BC; GX 1+4

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IAUC number 

                                                  Circular No. 3919
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


1984 BC
     This minor planet with direct opposition motion, discovered
by E. Helin and R. S. Dunbar with the 1.2-m Schmidt at Palomar (MPC
8509), has been reobserved by J. Gibson with the same instrument:

   1984 UT           R.A.  (1950.0)   Decl.    Mag.   Observer

   Jan. 30.43056    9 59 45.64   +18 24 02.4   17.5   Helin
   Feb. 10.33683   10 02 24.62   +24 51 07.7          Gibson
        11.38267   10 02 35.11   +25 29 48.1            "
        21.23962   10 04 05.68   +31 28 55.8            "

     Like 1983 XF, 1983 SA and 1982 YA (latest orbits are on MPC
8467, 8394 and 8534), 1984 BC has a decidedly cometary orbit.  An
approach within 0.7 AU of Jupiter is indicated for early 1986:

         T = 1984 Mar. 27.7956 ET
     Peri. =  41.0699                    e =   0.546825
     Node  = 130.1760   1950.0           a =   3.424165 AU
     Incl. =  22.5385                    n =   0.1555507
         q =   1.551746 AU               P =   6.336 years

     1984 ET     R.A. (1950.0) Decl.      p        r      Mag.

     Feb. 10    10 02.35    +24 38.7    0.645    1.623    17.3
          20    10 03.90    +30 45.1
     Mar.  1    10 05.83    +36 15.1    0.637    1.576    17.4
          11    10 09.69    +40 32.2
          21    10 16.72    +43 22.1    0.707    1.553    17.9
          31    10 27.33    +44 47.2
     Apr. 10    10 41.32    +44 57.0    0.819    1.558    18.3
          20    10 57.96    +44 04.0
          30    11 16.30    +42 19.4    0.955    1.588    18.8
     May  10    11 35.59    +39 53.3
          20    11 55.26    +36 55.4    1.109    1.642    19.2
          30    12 14.90    +33 34.2
     June  9    12 34.35    +29 57.3    1.285    1.717    19.5


GX 1+4
     P. Whitelock, South African Astronomical Observatory, telexes:
"Spectrograms obtained by J. Menzies on Feb. 23 and 26 show
very strong H-alpha emission.  Other emissions are due to H-beta, H-gamma
and He lines.  These observations are in complete contrast to those
reported on IAUC 3885 and suggest that activity has restarted."


1984 February 27               (3919)              Brian G. Marsden

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