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IAUC 5215: 1991l

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                                                  Circular No. 5215
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 HELIN-LAWRENCE (1991l)
     The following additional positions have been reported:

     1991 UT             R.A. (1950) Decl.        m1    Observer
     Mar. 19.59856   13 29 26.70   + 8 56 30.0          Gilmore
          19.61708   13 29 25.33   + 8 56 32.1            "
          19.72083   13 29 17.81   + 8 56 41.3          Lowe
          20.70041   13 28 02.18   + 8 58 31.0   14.5   McNaught
          21.18516   13 27 24.57   + 8 59 20.0          McCrosky
          21.19804   13 27 23.56   + 8 59 21.4            "
          21.23375   13 27 21.07   + 8 59 24.1          Balam
          21.25597   13 27 19.20   + 8 59 27.5            "

A. C. Gilmore and P. M. Kilmartin (Mt. John University Observatory).
  m2 = 15.4.
G. Lowe (Perth).  Communicated by P. Birch.
R. H. McNaught (Siding Spring).  Uppsala Southern Schmidt telescope.
  Short exposure.  Comet strongly condensed; 1' tail in p.a. 250 deg.
R. McCrosky and C.-Y. Shao (Oak Ridge).  1.55-m reflector + CCD.
D. Balam and J. Tatum (Victoria).

     Preliminary parabolic elements from 10 observations Mar. 17-21:

     T = 1992 Feb. 19.166 ET          Peri. = 262.890
                                      Node  =   9.648   1950.0
     q = 1.88148 AU                   Incl. = 102.503

     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     Mar. 15    13 35.05    + 8 47.5    3.391    4.279    14.5
          20    13 28.94    + 8 57.2
          25    13 22.32    + 9 05.9    3.241    4.190    14.3
          30    13 15.26    + 9 13.1
     Apr.  4    13 07.85    + 9 18.2    3.129    4.102    14.1
           9    13 00.16    + 9 20.9
          14    12 52.30    + 9 20.8    3.057    4.014    14.0
          19    12 44.38    + 9 17.4
          24    12 36.53    + 9 10.5    3.024    3.925    13.8


1991 March 21                  (5215)             Daniel W. E. Green

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