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IAUC 3588: P/GUNN; 1981 CW

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IAUC number 

                                                  Circular No. 3588
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 GUNN
     T. Nomura, Waseda University, Tokyo, writes that the 1954
comet recently noted on the Palomar Sky Survey (IAUC 3540) is in
fact a prediscovery record of P/Gunn.  Computations at the Central
Bureau have confirmed this identification.


1981 CW
     E. Bowell, Lowell Observatory, writes that N. G. Thomas has
discovered another probable Amor-type object on exposures with the
0.33-m photographic telescope at the Anderson Mesa station.  He
provides the discovery measurements below, together with probable
recovery measurements from similar plates taken by B. A. Skiff.

     1981 UT             R.A. (1950) Decl.       Mag.   Observer
     Feb.  6.17847    5 29 09.79   +29 17 09.0   16.0   Thomas
           6.22292    5 29 17.18   +29 17 55.6            "
     Mar.  9.11806    7 21 01.25   +32 56 52.7   16.8   Skiff
           9.14097    7 21 06.45   +32 56 49.1            "

     Computations by Bowell and by the undersigned lead to the
following approximate orbital elements: T = 1981 Jan. 29, Peri. = 10o,
Node = 109o, Incl. 4.5o, q = 1.16 AU, e = 0.30.  The resulting
ephemeris is:

1980/81     R. A. (1950) Decl.     Delta      r      Mag.
Nov. 17     4 52.52    + 9 05.5    0.342    1.311    16.1
     27     4 49.85    + 9 05.7
Dec.  7     4 44.00    + 9 54.2    0.265    1.245    15.3
     17     4 37.30    +11 38.1
     27     4 33.06    +14 20.9    0.232    1.195    15.2
Jan.  6     4 34.22    +17 50.1
     16     4 43.08    +21 43.6    0.234    1.165    15.5
     26     5 00.40    +25 34.6
Feb.  5     5 25.70    +28 56.5    0.262    1.161    15.9
     15     5 57.78    +31 26.6
     25     6 34.35    +32 50.3    0.314    1.182    16.4
Mar.  7     7 12.83    +33 03.0
     17     7 51.05    +32 10.4    0.394    1.227    17.0
     27     8 27.33    +30 25.6
Apr.  6     9 00.92    +28 02.9    0.505    1.288    17.6
     16     9 31.80    +25 15.4


1981 March 31                  (3588)              Brian G. Marsden

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