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IAUC 4853: PULSAR IN GLOBULAR CLUSTER M53; V745 Sco; Occn OF 28 Sgr BY TITAN; AS 296; 1989s

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IAUC number 

                                                Circular No. 4853
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


PULSAR IN GLOBULAR CLUSTER M53
     S. Anderson, S. Kulkarni, T. Prince, California Institute of
Technology; and A. Wolszczan, Arecibo Observatory, write:  "We report
the discovery of a 33-ms pulsar with a dispersion measure of 24 +/-
1.5 cmE-3 pc towards the globular cluster M53 (NGC 5024).  Observations
were made with the 305-m Arecibo reflector at a frequency of 430 MHz
using the same backend as that used in the discovery of pulsars in
the cluster M15 (e.g., IAUC 4772).  The analysis was done on the
Caltech NCUBE/10 supercomputer.  Confirmation observations show that
the new pulsar is within the 2' of the optical centroid of M53.  The
new pulsar is either an isolated pulsar or possibly a member of a
very wide binary system."


V745 SCORPII
     R. M. Hjellming, National Radio Astronomy Observatory, reports
the detection of a radio counterpart of the recurrent nova V745 Sco
from Very Large Array observations made on Sept. 1.  The radio source
was 5.7, 4.8, and 4.4 mJy at frequencies of 1.49, 4.9, and 8.4 GHz,
and is located at R.A. = 17h52m04s.64, Decl. = -33 14'31" (equinox
1950.0; uncertainty 1"), coincident with the optical position on IAUC
4821.


OCCULTATION OF 28 SAGITTARII BY TITAN
     With regard to the item by Zdanavicius and Cernis on IAUC 4825,
the period of minimum light lasted 6 s, beginning July 3d22h37m33s UT.


AS 296
     Visual magnitude estimates by P. Schmeer, Bischmisheim, West
Germany (cf. IAUC 4686):  Feb. 17.18 UT, 11.0; Mar. 7.14, 11.4; Apr.
28.07, 11.1; May 8.11, 11.7; July 5.98, 11.6; Sept. 5.90, 10.2.


COMET HELIN-ROMAN (1989s)
     Total visual magnitude estimates:  Sept. 7.21 UT, 12.3 (C. S.
Morris, Pine Mountain Club, CA, 0.26-m reflector; coma diameter
1'.9); 8.23, 13.2 (A. Hale, Las Cruces, NM, 0.41-m reflector).


1989 September 14              (4853)             Daniel W. E. Green

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