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IAUC 5293: 1991q

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                                                  Circular No. 5293
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


COMET LEVY (1991q)
     The following additional precise positions have been reported:

     1991 UT             R.A. (1950) Decl.        m1    Observer
     June 15.78281    1 48 36.64   +14 28 24.2          Gilmore
          15.78530    1 48 37.43   +14 28 33.2            "
          17.44271    1 56 09.19   +15 42 22.3    6.8   Helin
          17.45660    1 56 13.26   +15 42 55.2            "
          17.76311    1 57 36.49   +15 56 28.9    8.5   Kushida
          18.43924    2 00 42.22   +16 26 19.0          Tatum

A. C. Gilmore and P. M. Kilmartin (Mt. John University Observatory).
E. Helin, K. Lawrence, P. Rose, and J. Alu (Palomar).  0.46-m Schmidt.
Y. Kushida and R. Kushida (Yatsugatake South Base Observatory).
  0.40-m f/4.1 reflector.  Measurer O. Muramatsu.
J. B. Tatum (Victoria).  0.25-m astrograph.

     Preliminary parabolic orbital elements by S. Nakano, Sumoto,
Japan, from 6 observations, June 14-18:

     T = 1991 July  8.168 ET          Peri. =  41.311
                                      Node  = 329.824   1950.0
     q = 0.99533 AU                   Incl. =  19.361

     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     June 13     1 36.17    +12 22.5    1.300    1.085     8.4
          18     1 58.68    +16 07.0
          23     2 21.95    +19 42.1    1.299    1.029     8.2
          28     2 45.94    +23 03.1
     July  3     3 10.53    +26 05.8    1.329    0.999     8.1

     S. Larson, D. Levy, and T. Spahr, University of Arizona, report
that, when observed with the Catalina 1.5-m reflector on June 18.45
UT, the comet exhibited ion streamers, a dust fan, and one or
perhaps two dust envelopes.  A spectrum shows CN, C2, C3, H2O+, and
possibly NH2.
     Total visual magnitude estimates:  June 16.46 UT, 8.7 (C. S.
Morris, Pine Mountain Club, CA, 20x80 binoculars); 16.83, 8.3 (D. A.
J. Seargent, The Entrance, N.S.W., 15x80 binoculars); 17.45, 7.6 (D.
H. Levy, Tucson, AZ, 0.41-m reflector; 3' sunward fan); 17.86, 8.5
(A. Pearce, Scarborough, W.A., 20x80 binoculars).


1991 June 18                   (5293)             Daniel W. E. Green

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