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IAUC 3242: SN IN MCG 10-16-117; VISIBLE CANDIDATE FOR THE BINARY PULSAR; P/GUNN; V4021 Sgr (N Sgr 1977); GK Per

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IAUC number 

                                                  Circular No. 3242
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 617-864-5758


SUPERNOVA IN MCG 10-16-117
     J. Kristian, Hale Observatories, telegraphs that P. J. Young
and D. Ritchie have discovered a supernova 1" west and 24" south of
the nucleus of the galaxy MCG 10-16-117 = Zw 291-55 (R.A. = 11h16m.8, Decl.
= +59o34', equinox 1950.0).  On July 3.2493 UT the photographic
magnitude was 14.


VISIBLE CANDIDATE FOR THE BINARY PULSAR
     J. Kristian and J. A. Westphal, Hale Observatories, report the
detection of a visible candidate for the binary radio pulsar 1913+16.
The starlike object, which has been seen on the SIT slit viewing
camera at the Cassegrain focus of the Hale telescope and on CCD
detectors at the prime focus, is coincident with the radio timing
position to within the accuracy of the optical position (~ 1").
Its approximate V magnitude of 22.5 is more than three magnitudes
brighter than published limits for visible pulsed radiation.  If
identified with the pulsar, therefore, it is more likely to be the
previously unseen binary companion of the pulsar.


PERIODIC COMET GUNN
     Further precise positions have been reported as follows:

     1977 UT             R. A. (1950) Decl.        Observer
     Oct.  8.25998     2 16 15.21   + 4 18 59.0    McCrosky
     Dec. 13.63819     1 38 54.26   + 3 14 33.7    Jekabsons

R. E. McCrosky and J. H. Bulger (Harvard College Observatory).
P. Jekabsons (Perth Observatory, Bickley).  33-cm astrograph.


V4021 SAGITTARII (NOVA SAGITTARII 1977)
     Recent visual magnitude estimates have been reported as follows:
May 10.09 UT, 12.2 (G. Hurst, Northampton, England); July
1.16, 12.8 (S. O'Meara, Harvard College Observatory).


GK PERSEI
     Visual magnitude estimate by D. Green at Harvard College
Observatory's Agassiz Station: July 6.32 UT, 12.3.


1978 July 7                    (3242)              Brian G. Marsden

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