Central Bureau for Astronomical Telegrams
IAUC 2799: JUPITER; NEW SOFT X-RAY SOURCE; 1975a
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Circular No. 2799
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
JUPITER
Dr. R. F. Beebe, Department of Astronomy, New Mexico State
University, writes: "E. J. Reese reports the outbreak of a major new
disturbance in Jupiter's South Equatorial Belt (zenographic latitude
15o south). The disturbance was first photographed near longitude
(II) 68o on 5 July 1975. Plates taken on 25 June show no trace of
this complex dark feature."
NEW SOFT X-RAY SOURCE
G. W. Clark, Massachusetts Institute of Technology, reports
that the M.I.T. X-Ray Group has discovered an extended source of
very low energy (0.1-0.28 keV) X-rays at mid-galactic latitude in
the constellation Hercules. The source, designated MX1640+40, was
detected on 1 July 1975 by the SAS-3 X-Ray Observatory. The angular
width of the source in right ascension is 7o centered on 16h40m
(1950.0), the declination is +40o. The corresponding galactic
coordinates are l(II) = 64o, b(II) = 41o. In comparison with the Cygnus
Loop, also recently observed by SAS-3, MX1640+40 has a much softer
spectrum, and about 20% of the total flux in the 0.1-0.28 keV
channel. No supernova remnant has been reported at this position.
The weak X-ray source 3U1639+40, detected at much higher energies
by Uhuru, lies within the solid angle of the new source.
PERIODIC COMET BOETHIN (1975a)
The following precise positions have been reported:
1975 UT R. A. (1950) Decl. Observer
Apr. 29.05890 6 33 33.74 +28 17 11.2 Schwartz
30.06524 6 36 28.12 +28 13 40.3 "
June 3.18056 8 02 27.96 +24 57 38.0 Roemer
G. Schwartz (Harvard College Observatory, Agasslz Station). 155-cm
reflector. Measurer: C. Y. Shao.
E. Roemer and M. A. Daniel (University of Arizona). Steward
Observatory's 229-cm reflector, Kitt Peak. Measurer: C. McCarthy.
Star trails show effect of extinction at low altitude; one end
is very diffuse. Comet image diffuse and nearly invisible.
1975 July 11 (2799) Zdenek Sekanina
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