Central Bureau for Astronomical Telegrams
IAUC 5536: Vel X-1; 1950N, 1950O; N Sco 1992
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Circular No. 5536
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)
VELA X-1
J. Ballet, M. Denis, E. Churazov, and M. Gilfanov, on behalf
of the Granat SIGMA team (Service d'Astrophysique, CEN, Saclay;
Centre d'Etude Spatiale des Rayonnements, Toulouse; and Space
Research Institute, Moscow), report: "During the first 6 hr of
observation of the 12-s pulsar GRS 0834-430 on June 1 by the Granat
observatory, the SIGMA telescope detected the wind-fed x-ray pulsar
Vela X-1 (4U 0900-40). The observation began at June 1.58 UT,
which corresponds to an orbital phase of 0.52. SIGMA detected
coherent x-ray pulsations at the period of 284 +/- 1.5 s, in the
energy range 40-80 keV. The pulse profile has double sinusoidal
peaks, similar to that observed at lower energies. Vela X-1 was
not detected during an observation of its location on May 28.
Further observations of the Vela X-1 pulsar by Granat are scheduled
from June 12 to 16."
SUPERNOVAE 1950N AND 1950O IN ANONYMOUS GALAXIES
J. Mueller reports the discovery of two apparent supernovae on
prints from the first Palomar Sky Survey. SN 1950N was found at
mag about 18 on plates taken 1950 June 19 UT by R. G. Harrington
and A. G. Wilson, and is located 13" south of the nucleus of an
anonymous galaxy at R.A. = 17h01m11s.43, Decl. = +0 29'49".9 (
equinox 1950.0); there is no stellar image at this position on a red
plate taken 1992 May 29 by C. Brewer and Mueller in the course of
the second Palomar Sky Survey.
SN 1950O was found at mag about 17 on plates taken 1950 Apr.
18 by Wilson and Harrington, and is located 10".7 east and 10".6
south of the nucleus of an anonymous galaxy at R.A. = 16h12m55s.77,
Decl. = +19 04'54".4 (equinox 1950.0). There is no stellar image
at this position on a blue plate taken 1992 June 2 by C. Brewer and
J. D. Mendenhall in the course of the second Palomar Sky Survey.
NOVA SCORPII 1992
W. H. Allen, Carter Observatory, reports the following
photoelectric observations made at the Adams Lane Observatory, Blenheim,
N.Z., with the 0.32-m telescope: June 1.51 UT, V = 9.13, B-V =
+1.07, U-B = +0.01; 2.44, 9.22, +1.01, +0.03; 3.45, 9.03, +1.01,
+0.03; 5.44, 9.36, +0.95, +0.02 (comparison star HR 6371, V =
5.066, B-V = +0.884, U-B = +0.558).
1992 June 9 (5536) Daniel W. E. Green
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