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IAUC 5029: 1990c

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                                                  Circular No. 5029
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 (1990c)
     Further precise positions:

     1990 UT             R.A. (1950) Decl.        m1    Observer
     May  25.71285   23 57 19.73   +27 47 53.5          Sugie
          25.72292   23 57 20.03   +27 47 55.4            "
          26.33525   23 57 39.46   +27 49 51.4          Shao
          26.34070   23 57 39.64   +27 49 52.7            "
          26.73229   23 57 51.91   +27 51 05.5          Sugie
          26.74201   23 57 52.25   +27 51 08.5            "
          27.73507   23 58 23.14   +27 54 15.2          Natori
          28.70938   23 58 52.49   +27 57 21.6          Sugie
          28.71840   23 58 52.83   +27 57 23.0            "
          29.73316   23 59 22.79   +28 00 33.1          Natori
          29.73733   23 59 22.91   +28 00 35.9            "
     June  2.73837    0 01 14.64   +28 13 18.4    9.8   Seki
           2.78444    0 01 15.80   +28 13 27.8            "
           5.73218    0 02 30.08   +28 22 45.5          Kojima
           5.74913    0 02 30.40   +28 22 50.1            "

A. Sugie (Dynic Astronomical Observatory).
C.-Y. Shao (Oak Ridge Observatory).  1.5-m reflector.
A. Natori (JCPM Yakiimo Station).  Measured by T. Urata.
T. Seki (Geisei).
T. Kojima (YGCO Chiyoda Station).

     D. G. Schleicher, D. J. Osip, and T. J. Kreidl, Lowell Observatory;
and L. M. Sauter, Massachusetts Institute of Technology, report:
"Photometry obtained on June 3.4, 4.4, and 5.4 UT using the
John S. Hall 1.07-m telescope at Lowell Observatory yields the
following Haser model production rates based on fluxes measured within
a 53"-diameter aperture:  log Q(OH) = 29.20, log Q(CN) = 26.45, log
Q(C2) = 26.23, log Q(C3) = 25.22, and log Q(NH) = 26.2; dust production
(cf. IAUC 4983): log (A f rho) = 3.7.  There was no evidence of
night-to-night variations."
     Total visual magnitude estimates:  May 27.43 UT, 9.7 (J. E.
Bortle, Big Bear, CA, 0.20-m reflector); June 2.44, 9.6 (C. S.
Morris, Pine Mountain Club, CA, 20x80 binoculars); 3.39, 9.3 (G.
Kronk, Troy, IL, 0.33-m reflector); 4.05, 8.8 (G. Keitch, Wrington,
Avon, England, 20x80 binoculars); 4.45, 9.6 (Morris); 5.46, 8.6 (D.
Levy, Tucson, AZ, 7x50 binoculars).


1990 June 7                    (5029)             Daniel W. E. Green

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