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IAUC 3928: SN IN Anon GALAXY; X-RAY PULSAR IN LMC; 1982i; P/ENCKE; R CrB

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IAUC number 

                                                  Circular No. 3928
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


SUPERNOVA IN ANONYMOUS GALAXY
     C. Kowal, California Institute of Technology, reports his
discovery of a supernova 8" due east of an anonymous galaxy at R.A. =
13h35m7, Decl. = -27deg40' (equinox 1950.0).  The object was not visible
on Feb. 7.  It was at mpg = 17.5 on Mar. 2 and confirmed on Mar. 4.


X-RAY PULSAR IN LARGE MAGELLANIC CLOUD
     F. D. Seward and F. R. Harnden, Jr., Harvard-Smithsonian Center
for Astrophysics; and D. Helfand, Columbia Astrophysical Laboratory,
report the discovery of an x-ray pulsar within or close to
the Crab-like supernova remnant 0540-69.3 in the LMC.  Pulsations
were detected in four separate observations with the Einstein
Observatory IPC.  On 1979 Sept. 8.01 UT the barycentric period was
50.206102 +/- 0.000040 ms, and the period derivative measured during
1979 Apr. 11-Nov. 11 was 41.8 +/- 0.2 ns/day.  Comparison with
the Crab and Vela pulsars suggests that radio detection should be
possible and that optical pulsations may also be observable.


PERIODIC COMET HALLEY (1982i)
     J. Lecacheux, O. Le Fevre, J. Baudrand, J. P. Lemonnier and
G. Mathez, Observatoire de Meudon: and G. Lelievre, Canada-France-
Hawaii Telescope, report that electronographic bidimensional
photometry at the CFHT prime focus showed a suspicion of strong
variability from night to night and the following B magnitudes in the
course of one night: Feb. 4.266 UT, 24.4; 4.298, 24.2; 4.334, 23.2;
4.404, 22.8.  The photometric calibration was from the stars in SA
51 measured by Purgathofer (1969).


PERIODIC COMET ENCKE
     Total visual magnitude estimates: Mar. 3.00 UT, 8.7 (D. W. E.
Green, Harvard, MA, 0.20-m reflector); 4.00, 8.4 (Green, Cambridge,
MA); 8.01, 8.3 (J. Bortle, Stormville, NY, 0.32-m reflector);
11.15, 7.8 (C. S. Morris, Whitaker Peak, CA, 20 x 80 binoculars).


R CORONAE BOREALIS
     Visual magnitude estimates by M. Verdenet, Bourbon-Lancy,
France: 1983 Nov 22, 13.1; Dec. 3.2, 13.8; 1984 Feb. 15.20, 11.7.


1984 March 13                  (3928)              Brian G. Marsden

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