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IAUC 7775: 2001 X2; PSR J0205+6449

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                                                  Circular No. 7775
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
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COMET 2001 X2
     J. V. Scotti, Lunar and Planetary Laboratory, reports his
discovery of a comet on CCD images taken with the 0.9-m Spacewatch
telescope, noting a coma diameter of 5" and a tail 0'.40 long in
p.a. 283 deg (and m_2 = 22.7).  Confirming observations were made
at Klet by J. Ticha, M. Tichy, and P. Jelinek, who reported a 8"
coma and a faint westward tail.

     2001 UT             R.A. (2000) Decl.        m1    Observer
     Dec. 14.43924    8 13 21.88   +16 34 52.1          Scotti
          14.46482    8 13 21.44   +16 34 51.5   19.3     "
          14.48687    8 13 21.08   +16 34 51.7   19.5     "
          14.97498    8 13 13.44   +16 34 51.7   18.4   Ticha
          14.98387    8 13 13.38   +16 34 53.0            "
          14.98728    8 13 13.17   +16 34 51.8   18.6     "


PSR J0205+6449
     V. Malofeev, O. Malov, and A. Glushak, Pushchino Radio
Astronomy Observatory, Astro Space Center, Lebedev Physical
Institute, report the detection of radio emission from PSR
J0205+6449 with the same period (65.68 ms) as the x-ray pulsar,
which was discovered in the center of the young supernova remnant
3C 58 in August (Murray et al. 2001,
http://xxx.lanl.gov/abs/astro-ph/?0108489):  "We observed during
2001 Sept.-Nov. with the Large Phased Array, a sensitive transit
antenna consisting of 16 384 dipoles and an operating frequency of
110.5 +/- 1.5 MHz.  The mean flux density was 30 mJy, and the width
of the integrated profile at 50 percent of maximum intensity is
about 8 ms (S/N = 19, with an integration of 37 785 pulses at 110.5
MHz).  At about one half the pulsar period, there is an interpulse
with 25 percent of the main pulse intensity.  The estimate for the
dispersion measure of 24 pc/cm**3 places the pulsar at a distance
about 1100 pc, according to the Taylor and Cordes (1993, Ap.J. 411,
674) model of the interstellar medium.  Confirming observations at
88 MHz were made with the east-west arm of the Wide-Band Cross-type
Radiotelescope DKR-1000 (area about 40 000 m**2) during Oct. 3, 7,
10, and 11.  The width of the integrated profile is about 12 ms and
the flux density < 150 mJy, and we estimate that the spectral index
is between 2 and 5.  We derive a period of 0.0656789(1) s and a
period derivative of 1.9(2) x 10**-13 on JD 2451901.330 (in good
agreement with the x-ray data of Murray et al. for the same epoch)."

                      (C) Copyright 2001 CBAT
2001 December 14               (7775)            Daniel W. E. Green

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