Central Bureau for Astronomical Telegrams

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IAUC 6014: 1994n; 1994m; 1993J

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                                                  Circular No. 6014
Central Bureau for Astronomical Telegrams
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

     R. H. McNaught reports his discovery of a comet on a 110-min exposure on
July 6 by M. Hartley with the 1.2-m U.K. Schmidt telescope at Siding Spring,
and he provides the following measurements, also from a plate obtained the
night before in very bad seeing.  The discovery plate shows a very strong
condensation, a 15" coma and a tail in p.a. 270 deg.

     1994 UT             R.A. (2000) Decl.        m1
     July  5.67164   21 36 25.66   -41 43 55.6
           6.60581   21 36 19.76   -41 50 17.0    16
           6.68220   21 36 19.03   -41 50 47.9

     Precise positions measured by D. D. Balam from CCD images by
J. B. Tatum and himself with the 0.5-m reflector at the Climenhaga

     1994 UT             R.A. (2000) Decl.
     July  7.37549    3 53 06.04   +70 10 55.5
           7.38414    3 53 04.73   +70 10 54.2
           7.39098    3 53 03.74   +70 10 54.1

     H.-U. Zimmermann, B. Aschenbach, G. Hasinger, W. Pietsch, P. Predehl
and J. Trumper, Max-Planck-Institut fur Extraterrestrische Physik; W.
Lewin and E. Magnier, Massachusetts Institute of Technology; J. van
Paradijs, University of Amsterdam; G. Fabbiano, Harvard-Smithsonian
Center for Astrophysics; L. Lubin, Princeton University; and R. Petre,
NASA Goddard Space Flight Center, report: "One year after the original
detection, supernova 1993J was reobserved by the x-ray observatory ROSAT.
A 2000-s exposure taken on 1994 Apr. 4 showed the source at a rate of
0.018 +/- 0.003 cts/s in the energy range 0.1-2.4 keV of the PSPC
detector.  With the PSPC measurements from early May 1993 (when the soft
x-ray rate had settled at 0.052 +/- 0.002 cts/s after the rapid decrease
during the first few weeks) and Nov. 1993 (0.035 +/- 0.001 cts/s),
the new observation suggests that the x-ray count rate has decreased
linearly over the past year with a gradient of about 0.038 cts s-1 yr-1.
As reported previously by us (IAUC 5899), the temperature decreased
significantly during the first half year, while the absorbing column
density increased.  The new data continue to show this trend."

1994 July 7                    (6014)              Brian G. Marsden

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