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IAUC 4849: 1989s; 1989O

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IAUC number 

                                                Circular No. 4849
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-ROMAN (1989s)
     The following additional precise positions have been reported:

     1989 UT             R.A. (1950) Decl.       Observer
     Sept. 7.21917   17 44 53.68   -10 06 30.3   Balam
           7.46357   17 44 10.66   -10 31 43.5   McNaught

D. D. Balam (Victoria).  0.25-m Schmidt telescope.  Image trailed.
R. H. McNaught (Siding Spring).  Uppsala Southern Schmidt telescope.
  Comet well condensed, faint tail to the east.

     Preliminary parabolic orbital elements from six observations:

     T = 1989 Aug. 20.865 ET          Peri. = 155.480
                                      Node  = 127.920   1950.0
     q = 1.32713 AU                   Incl. = 127.850

     1989 ET      R.A. (1950) Decl.     Delta      r       m1
     Sept. 7    17 45.55    - 9 43.1    0.713    1.351    12.6
           9    17 39.99    -13 02.0
          11    17 35.21    -15 55.2    0.817    1.364    12.9
          13    17 31.11    -18 26.8
          15    17 27.58    -20 39.9    0.929    1.379    13.2
          17    17 24.56    -22 37.6
          19    17 21.97    -24 22.2    1.045    1.396    13.5
          21    17 19.76    -25 55.8
          23    17 17.88    -27 19.9    1.162    1.415    13.8
          25    17 16.31    -28 36.1
          27    17 15.00    -29 45.3    1.280    1.437    14.1
          29    17 13.94    -30 48.6
     Oct.  1    17 13.09    -31 46.9    1.397    1.460    14.4


SUPERNOVA 1989O IN MCG 6-1-26
     R. Kirshner, C. Smith, and N. Levenson, Center for Astrophysics,
report:  "A spectrum (420-840 nm) taken at the Multiple
Mirror Telescope on Sept. 7.35 UT shows the 615-nm dip reported by
Mould (cf. IAUC 4846).  The galaxy position is R.A. = 0h18m27s.19,
Decl. = +34 14'17" (equinox 1950.0; +/- 1") and the previously
reported offset is accurate."


1989 September 7               (4849)             Daniel W. E. Green

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