Central Bureau for Astronomical Telegrams
IAUC 2843: MX0656-07; 1975b; 29999-321-2852
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Read IAUC 2844
Circular No. 2843
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS
MX0656-07
G. W. Clark, Massachusetts Institute of Technology, reports
that the SAS-3 Group has discovered an x-ray nova in Monoceros at a
position with an error circle (90-percent confidence) of radius 15'
centered on R.A. = 6h56m.3, Decl. = -7o07'.2 (equinox 1950.0); l = 220o.17,
b = -1o.66. The nova was observed during the first of a recent series
of scans along the galactic plane on Sept. 20.51 UT. It was not
detected during an earlier series of scans that terminated on Sept.
2.60 UT. The spectrum from 1.3 to 13 keV is comparable in hardness
to that of the Crab Nebula. The intensity varies by about 30 percent
on a timescale of 100 seconds, but its average value over the
period of an orbit has remained nearly constant for 4 days at 0.08
times the intensity of the Crab.
G. D. Schmidt and J. R. P. Angel, Steward Observatory, report
that in a search for an optical counterpart a 20' field centered on
the x-ray coordinates was photographed using the 229-cm reflector.
Two red plates obtained in moonlight on Sept. 24.5 UT were compared
with the red Palomar Sky Survey plate. No new stars brighter than
magnitude 19 were apparent.
PERIODIC COMET WEST-KOHOUTEK-IKEMURA (1975b)
L. Kohoutek, Hamburg Observatory, provides the following
precise positions. Measurer: M. Dieckvoss. Images of the comet could
not be located on plates taken on May 12.9 and 27.9 UT.
1975 UT R. A. (1950) Decl.
Mar. 16.82257 3 32 22.53 +24 42 08.7
20.83403 3 44 09.57 +26 33 57.5
21.82083 3 47 06.98 +27 00 35.2
31.81580 4 18 18.45 +31 08 47.6
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1975 October 1 (2843) Brian G. Marsden
Read IAUC 2844
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