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IAUC 4429: V394 CrA; PSR 1951+32; NSV 6708

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IAUC number 

                                                  Circular No. 4429
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


V394 CORONA AUSTRINAE
     R. H. McNaught, Siding Spring Observatory, reports that a star
of mag about 18 on a 1975 June 3 U.K. Schmidt J plate appears identical
with V394 CrA (measured position:  R.A. = 17h56m58.18, Decl. = -39 00'29.3,
equinox 1950.0).  Measurement of a 1987 Aug. 3.7 UT Uppsala Schmidt
exposure yields the following end figures: 58s.21, 29".4.  The object
also appears at mag about 18 on several plates exposed at Palomar, at
the European Southern Observatory, and with the U.K. Schmidt
Telescope during 1964-1979.
     Further visual magnitude estimates:  Aug. 2.847 UT, 9.8: (J.
Isles, Akrounda, Cyprus); 3.762, 10.6 (Isles); 3.81, 10.2 (D.
Overbeek, Edenvale, R.S.A.); 4.50, 10.6 (A. Pearce, Woodlands,
W.A.); 4.51, 10.2 (D. A. J. Seargent, The Entrance, N.S.W.).


PSR 1951+32
     T. R. Clifton and D. C. Backer, University of California at
Berkeley; and G. Neugebauer, S. R. Kulkarni, J. Graham, and K.
Matthews, Palomar Observatory, California Institute of Technology,
write:  "A search for infrared pulses has been conducted on PSR
1951+32 (cf. IAUC 4422) coincident with the x-ray point source in
supernova remnant CTB 80.  On July 9, the 5.08-m Hale telescope was
used at a wavelength of 1.6 microns with a 7" aperture centered on
optical candidate No. 1 of Blair and Schild (1985, Ap. Lett. 24, 189)
at R.A. = 19h51m02.58, Decl. = +32 44'50.2 (equinox 1950.0).  These data
were originally obtained to search for the pulsar prior to its
discovery at radio wavelengths.  The detected signal was sampled at 1
kHz for 40 min, but an off-line Fast Fourier Transform analysis
revealed no pulsations at or near the expected pulse period or its
harmonics.  These data place an upper limit on any pulsed infrared
flux of about 4 micro-Jy averaged over the pulse period."


NSV 6708
     Visual magnitude estimates by V. F. de Assis Neto (A), Sao
Francisco de Oliveira, Brazil; R. H. McNaught (M), Siding Spring
Observatory; and P. Williams (W), Heathcote, N.S.W.: July 17.07 UT,
9.8 (A); 17.63, 10.6: (M); 18.40, 11.6 (W); 20.42, 11.9 (W); 23.63,
12.0: (M); 25.39, 11.9 (W); 26.43, 11.9 (W); 27.41, 11.8 (W);
28.41, 11.8: (M); 31.47, 11.7 (W); Aug. 4.51, 11.2 (M).


1987 August 4                  (4429)            Daniel W. E. Green

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