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IAUC 3905: VY Aqr; 1983 XF

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                                                  Circular No. 3905
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


VY AQUARII
     Visual magnitude estimates by M. Verdenet, Bourbon-Lancy,
France: 1983 Dec. 11.7, 12.8; 14.7, 13.5; 17.7, ]12.5; 20.7, 13.4:.


1983 XF
     This object, discovered by E. Bowell at the Lowell Observatory's
Anderson Mesa Station on 1983 Dec. 1 (MPC 8372) and independently
by A. Mrkos at the Klet Observatory on Dec. 4, seems to
be of asteroidal appearance but has a decidedly cometary orbit.  A
60-min exposure on 1984 Jan. 2 by E. Everhart with the stopped-
down 0.4-m reflector at the Chamberlin Observatory's Field Station
showed no trace of coma or tail.  Observations and orbital elements
(which indicate passage within 0.4 AU of Jupiter in 1926) follow:

   1983/84 UT        R.A.  (1950.0)  Decl.     Mag.   Observer

   Nov. 28.21181    4 28 40.78   +20 41 33.3   16.5   Bowell
        28.27292    4 28 37.41   +20 41 43.6            "
   Dec.  1.30347    4 25 48.61   +20 49 03.9   16.5     "
         1.34028    4 25 46.49   +20 49 09.8            "
         4.79078    4 22 25.48   +20 57 47.6   16.7   Mrkos
         4.80495    4 22 24.65   +20 57 50.1            "
         5.20000    4 22 01.50   +20 58 54.0   16.5   Bowell
         5.22431    4 21 59.74   +20 59 00.0            "
         5.85000    4 21 22.59   +21 00 36.0          Mrkos
         5.86418    4 21 21.52   +21 00 38.5            "
         6.18889    4 21 02.74   +21 01 29.3   16.5   Bowell
         6.22569    4 21 00.43   +21 01 35.0            "
         8.81115    4 18 26.01   +21 08 27.6          Mrkos
         8.82529    4 18 25.22   +21 08 28.6            "
         9.17083    4 18 04.78   +21 09 30.4   16.8   Bowell
         9.20833    4 18 02.40   +21 09 36.5            "
        29.09931    4 02 07.68   +22 15 58.4   17.0     "
        29.18194    4 02 05.04   +22 16 20.8            "
   Jan.  2.12118    4 00 36.30   +22 33 10.4          Everhart
         2.15347    4 00 35.75   +22 33 18.2   16.8   Bowell

         T = 1984 Mar. 7.9086 ET
     Peri. =  54.6510                    e =   0.534724
     Node  =  73.2222   1950.0           a =   3.113246 AU
     Incl. =   4.1612                    n =   0.1794254
         q =   1.448518 AU               P =   5.493 years


1984 January 4                 (3905)              Brian G. Marsden

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