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IAUC 4494: 1987d1; 1987A

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                                                  Circular No. 4494
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444

     H. Kosai, Tokyo Astronomical Observatory, reports the discovery
of a comet by Yoshimi Ichimura, Yoshimi-machi, Saitama.  The
following information is available:

    1987 UT           R. A.  (1950)  Decl.       m1    Observer
    Nov. 22.521      3 57.7        -19 12         9    Ichimura
         23.06       3 54.5        -20 27         9    Rudenko
         23.195      3 53.5        -20 45         9       "
         23.44844    3 52 08.09    -21 26 16.1         Herald
         23.47254    3 51 58.75    -21 30 00.3            "
         23.497      3 52.0        -21 36         9    Tregaskis
         23.53       3 51.7        -21 39              Pearce

Y. Ichimura (Iwaki Observatory, Fukushima).  0.12-m binoculars.
   Comet diffuse without condensation.
M. Rudenko (Amherst, MA).  0.15-m refractor.  Very diffuse, coma
   diameter > 5'.
D. Herald (Kambah, near Canberra).  Nov. 23.44844 image weak.
T. B. Tregaskis (Mt. Elisa, Victoria).  0.15-m reflector.  Very
   diffuse, no condensation, coma diameter about 10'.
A. Pearce (Perth, W. Australia).  Coma diameter 12'.

     D. Burrows, J. Nousek and G. Garmire, Pennsylvania State
University, report:  "We observed SN 1987A with a sounding rocket-borne
soft-x-ray telescope (+ CCD imaging detector provided by the Jet
Propulsion Laboratory), launched from Woomera, South Australia, on
Nov. 14.59 UT.  The vehicle, pointing system, and instrument all
performed nominally, but no soft x-rays from SN 1987A were detected
above background.  Based on preliminary analysis of the data, a
conservative upper limit of 5 x 10E-12 erg/cm2/s may be placed on
x-ray emission in the 0.75- to 2-keV energy band from SN 1987A.
Further analysis and a refined aspect solution will improve this
limit and extend it to lower energy.  The payload was successfully
recovered and has been field-refurbished for reflight in 1988 Jan."
     Visual magnitude estimates by A. C. Beresford, Adelaide, South
Australia:  Nov. 17.5 UT, 6.1; 19.47, 5.9; 20.44, 6.0; 21.63, 6.0.

1987 November 23               (4494)            Daniel W. E. Green

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