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IAUC 5411: 1991 VL; 1991b1

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                                                  Circular No. 5411
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


1991 VL
     Further precise positions, including prediscovery positions,
have been reported from films taken with the 0.46-m Palomar Schmidt
by teams led by E. M. Shoemaker (with C. S. Shoemaker, D. H. Levy and T.
King) and E. Helin (with K. Lawrence, P. Rose and R. Bambery):

     1991 UT             R.A. (2000) Decl.        B     Observer
     Oct.  5.39861    2 05 23.21   +29 00 39.9   17.9   Shoemaker
           5.43733    2 05 19.51   +29 00 40.3            "
          10.43021    1 56 55.93   +28 55 55.3   17     Helin
          10.45313    1 56 53.57   +28 55 52.0            "
          12.43264    1 53 13.48   +28 51 20.3            "
          12.45764    1 53 10.66   +28 51 16.3            "
     Dec.  1.10851    0 10 29.80   +18 36 52.7   17.0   Shoemaker
           1.14913    0 10 26.64   +18 36 14.8            "
           3.10069    0 08 07.04   +18 05 39.4            "
           3.13351    0 08 04.69   +18 05 09.4            "

     Orbital elements from 13 observations Oct. 5-Dec. 3:

     T = 1992 Mar. 13.9688 TT         Peri. = 226.3099
     e = 0.771515                     Node  = 310.8118  2000.0
     q = 0.419078 AU                  Incl. =   9.1955
       a =  1.834162 AU    n = 0.3967781    P =   2.484 years

1991/92     R. A. (2000) Decl.     Delta      r    Elong. Phase      V
Dec. 20    23 56.75    +14 23.9    1.029    1.510   97.2   40.3     16.5
     30    23 56.64    +12 53.7    1.042    1.390   86.6   44.9     16.5
Jan.  9     0 00.53    +11 51.7    1.044    1.264   77.1   49.3     16.4
     19     0 07.63    +11 11.6    1.028    1.130   68.3   54.0     16.3
     29     0 17.03    +10 43.2    0.989    0.988   60.1   59.8     16.1
Feb.  8     0 27.46    +10 09.9    0.920    0.839   52.0   68.0     15.8
     18     0 35.99    + 8 56.7    0.820    0.685   43.3   81.5     15.6
     28     0 34.61    + 5 39.0    0.693    0.539   31.5  106.4     15.8


PERIODIC COMET SHOEMAKER-LEVY 6 (1991b1)
     Total visual magnitude estimate by A. Hale, Las Cruces, NM (0.41-m
reflector): Dec. 7.20 UT, 12.2.


1991 December 24               (5411)              Brian G. Marsden

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