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IAUC 4819: TEN-Millisec PULSAR IN M13; GK Per; JUPITER; 1989o

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                                                  Circular No. 4819
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


TEN-MILLISECOND PULSAR IN M13
     S. Anderson, S. Kulkarni and T. Prince, California Institute of
Technology; and A. Wolszczan, Arecibo Observatory, report: "A 10-ms
pulsar has been discovered in the direction of the globular cluster M13
(NGC 6205).  The data were obtained from the 300-m Arecibo telescope at
a frequency of 430 MHz on May 20 and analyzed on the Caltech NCUBE/10
supercomputer.  The telescope was pointed toward the cluster's optical
center (R.A. = 16h39m54s.2, Decl. = +36d33'16", equinox 1950.0); the
telescope beamwidth is about 12'.  The dispersion measure of the pulsar
is 30.5 +/- 1 pc cm-3.  The pulse profile consists of a single pulse
with a duty cycle of 15 percent."


GK PERSEI
     G. M. Hurst, The Astronomer, informs us that W. Worraker, Didcot,
England, has reported this 1901 nova to be in a minor outburst, the
first since 1986 Dec. (cf. IAUC 4282, 4285, 4373).  Visual magnitude
estimates: 1988 Nov. 11.5 UT, 13.0 (S. Kiyota, Tsukuba, Japan); Dec.
25.9, 13.2 (A. Mizser, Budapest, Hungary); 1989 Jan. 11.8, 13.1
(Mizser); 26.85, 13.0 (A. Boattini, Florence, Italy); Feb. 8.88, 13.3
(R. Monella, Covo, Italy); 23.06, 12.5 (P. Sventek, Houston, TX);
Mar. 6.87, 13.0 (P. Schmeer, Bischmisheim, West Germany); 26.9, 13.0
(Mizser); July 14.07, 12.7 (Worraker); 27.05, 11.7 (Worraker); 28.10,
11.5 (Schmeer); 29.04, 11.7 (Schmeer).


JUPITER
     S. O'Meara, Sky and Telescope, reports that his observations on
July 29.4 UT show that the SEB has not completely disappeared (cf. IAUC
4815, 4818), but it has faded dramatically.  The feature appears as a
thin, dusky band across the entire face of the planet.  The SEB(S) is
the darker of the two components, although it appears threadlike.  The
SEB(N) is fainter, duskier and irregular.


PERIODIC COMET BRORSEN-METCALF (1989o)
     Total visual magnitude estimates: July 26.30 UT, 7.6 (C. E. Spratt,
Victoria, BC, 0.08-m refractor); 27.10, 7.0 (G. Keitch, Wrington, Avon,
England, 10 x 50 binoculars; coma diameter 8'; in moonlight); 29.33, 6.9
(S. O'Meara, West Roxbury, MA, 10 x 50 binoculars).


1989 July 29                   (4819)              Brian G. Marsden

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