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IAUC 4494: 1987d1; 1987A

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IAUC number 

                                                  Circular No. 4494
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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


COMET ICHIMURA (1987d1)
     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'.


SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
     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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