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IAUC 5220: 1991k

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                                                  Circular No. 5220
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


PERIODIC COMET MRKOS (1991k)
     The following additional precise positions have been reported:

     1991 UT             R.A. (1950) Decl.        m2    Observer
     Mar. 16.73542   12 45 04.25   - 2 32 45.3          Kushida
          17.60104   12 42 45.92   - 3 28 58.7            "
          19.55400   12 37 21.92   - 5 36 31.2          Gilmore
          19.56350   12 37 20.25   - 5 37 08.3            "
          19.63138   12 37 08.40   - 5 41 36.4   15.1     "
          19.63444   12 37 07.86   - 5 41 48.7            "
          19.67951   12 37 00.95   - 5 44 49.9          Lowe
          19.70041   12 36 56.43   - 5 46 10.8          McNaught
          20.52049   12 34 38.07   - 6 40 19.2   14.8     "
          20.78472   12 33 50.82   - 6 57 45.8            "
          21.18954   12 32 42.12   - 7 24 55.4          McCrosky
          21.19256   12 32 41.56   - 7 25 07.9            "
          21.26569   12 32 29.34   - 7 29 59.4          Balam
          21.30528   12 32 22.08   - 7 32 45.1            "
          21.43669   12 32 00.06   - 7 40 51.2          McNaught
          21.73461   12 31 06.22   - 8 00 33.0            "

Y. Kushida and O. Muramatsu (Yatsugatake South Base Observatory).
  Prediscovery observations.  m1 = 14.  Communicated by H. Kosai.
A. C. Gilmore and P. M. Kilmartin (Mt. John University Observatory).
G. Lowe (Perth).  Communicated by P. Birch.
R. H. McNaught (Siding Spring).  Uppsala Southern Schmidt telescope.
  On Mar. 20, comet was extremely condensed with very small coma.
R. E. McCrosky and C.-Y. Shao (Oak Ridge).  1.55-m reflector + CCD.
D. Balam and J. Tatum (Victoria).

     Orbital elements from 20 observations Mar. 16-21:

     T = 1991 Mar. 19.342 ET          Peri. = 180.681
     e = 0.56298                      Node  =   1.015   1950.0
     q = 1.41397 AU                   Incl. =  31.719
       a =  3.23552 AU     n = 0.169351     P =   5.82 years


1991 March 22                  (5220)             Daniel W. E. Green

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