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IAUC 5212: 1991k

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                                                  Circular No. 5212
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 MRKOS (1991k)
     On Mar. 17 Antonin Mrkos, Klet Observatory, reported his
discovery of a rapidly moving object.  Films taken at Palomar by E.
Helin et al. show the object to be somewhat diffuse, and Mrkos later
described the object as diffuse with central condensation.
Available observations:

     1991 UT             R.A. (1950) Decl.        m1    Observer
     Mar. 16.95628   12 44 29.36   - 2 47 07.9   15     Mrkos
          16.97017   12 44 27.13   - 2 48 00.8            "
          17.03753   12 44 16.12   - 2 52 20.0   15       "
          17.04517   12 44 14.79   - 2 52 52.2            "
          17.98406   12 41 43.03   - 3 53 58.3            "
          17.99170   12 41 41.72   - 3 54 28.3            "
          18.02642   12 41 35.98   - 3 56 38.7   15       "
          18.03406   12 41 34.62   - 3 57 07.8            "
          18.24219   12 41 01.86   - 4 10 45.1   14.0   Helin
          18.27500   12 40 56.11   - 4 12 54.9            "
          18.54028   12 40 11.89   - 4 29 53.9   15     McNaught
          18.62014   12 39 59.01   - 4 35 07.3   13     Lowe
          18.88368   12 39 13.86   - 4 52 14.0            "

A. Mrkos (Klet).  Precise positions telexed by Z. Ceplecha.
E. Helin, K. Lawrence, and P. Rose (Palomar).  0.46-m Schmidt
  telescope.
R. H. McNaught (Siding Spring).  Uppsala Southern Schmidt telescope.
  Badly comatic images.
G. Lowe (Perth).  Fuzzy trail.  Communicated by M. P. Candy.

     The following preliminary parabolic orbital elements are from 8
observations Mar. 16-18.  The comet may be of short period.

     T = 1991 Mar. 20.992 ET          Peri. = 181.852
                                      Node  =   1.941   1950.0
     q = 1.55617 AU                   Incl. =  40.651

     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     Mar. 15    12 49.59    - 0 41.6    0.584    1.558    13.8
          20    12 36.12    - 6 05.9
          25    12 21.54    -11 35.0    0.566    1.557    13.7
          30    12 06.45    -16 52.4
     Apr.  4    11 51.53    -21 43.3    0.594    1.568    13.8


1991 March 19                  (5212)             Daniel W. E. Green

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