Central Bureau for Astronomical Telegrams
IAUC 2965: X-RAY SOURCES; CI Cyg; 1975l
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Circular No. 2965
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
X-RAY SOURCES
A. M. Wilson and G. F. Carpenter, Department of Space Research,
University of Birmingham, communicate: "Further analysis of our
observations of Cir X-1 (Wilson and Carpenter 1976, Nature 261, 295)
gives the following revised position for this source: R.A. = 15h16m46s,
Decl. = -56o59'20" (equinox 1950.0; 90-percent-confidence radius 55").
We note that the optical candidate proposed by Mayo et al. (IAUC
2957) lies 17" from our most probable position."
L. J. Kaluzienski, S. S. Holt, M. Esfandiari, E. A. Boldt and
P. J. Serlemitsos, Goddard Space Flight Center, report the detection
of a flare in Aquila with the Ariel 5 all-sky monitor. The
intensity at 3-6 keV was approximately 0.3 times that of the Crab
on June 7 and <~ 0.2 times the Crab for at least one week prior to
that date. The flux increased steadily between June 7 and 13 (being
~ 0.7 times the Crab on June 10 and 1.0 times on June 13) and
remained at about the level of the Crab through June 16. While a
new transient source can not be excluded at present, the data are
entirely consistent with Aql X-1 (3U 1908+00) as the flare source
candidate: the risetime and peak flux level are similar to those
observed in the June 1975 flare of that source (cf. IAUC 2788).
CI CYGNI
J. Mattei, American Association of Variable Star Observers, informs
us that this symbiotic variable has been at maximum since mid-Dec.
1975 (cf. IAUC 2881, 2905). Recent visual magnitude estimates:
May 7.1 UT, 9.4 (D. Bohn); 11.2, 9.3 (E. Hayden); 19.0, 9.5 (D.
Weier); 26.3, 9.4 (R. Annal); 28.1, 9.4 (L. Hazel).
PERIODIC COMET HARRINGTON-ABELL (1975l)
The following precise positions have been obtained with the
155-cm reflector at the Harvard College Observatory's Agassiz Station.
Measurers: C. Y. Shao and J. H. Bulger.
1975/76 UT R. A. (1950) Decl. Observer
Dec. 4.07687 1 59 52.53 +29 56 05.8 J. H. Bulger
Jan. 2.02069 1 59 50.13 +28 00 05.7 G. Schwartz
Feb. 24.03808 3 16 43.13 +28 43 47.5 R. E. McCrosky
1976 June 17 (2965) Brian G. Marsden
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