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IAUC 2820: POSITIONS OF X-RAY SOURCES; WILD'S Var OBJECT; JUPITER XIII

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IAUC number 

                                                  Circular No. 2820
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


POSITIONS OF X-RAY SOURCES
     R. Doxsey, Massachusetts Institute of Technology, reports the
following precise positions, obtained with the rotating modulation
collimators on SAS-3, for four x-ray sources:

                  R. A. (1950) Decl.
     Aql X-1   19 08 44.1    + 0 30 51
     Ser X-1   18 37 32      + 4 59 20
     GX9+9     17 28 50.5    -16 55 57
     GX17+2    18 13 11.6    -14 03 10

All positions have 90-percent confidence error radii of 1'.  The
positions for GX9+9 and GX17+2 are consistent with proposed optical
counterparts for those sources (Davidsen, Malina and Bowyer 1975,
preprint; Tarenghi and Reina 1972, Nature Phys. Sci. 240, 53), but
the new position for Aql X-1 rules out the proposed identification
of Davidsen et al. (see also IAUC 2793).


WILD'S VARIABLE OBJECT
     D. Wills, Department of Astronomy, University of Texas, writes:
"A direct IIa-O plate of Wild's variable, possible BL Lac-type object
(IAUC 2791) obtained by H. J. Smith with the McDonald Observatory's
213-cm reflector on Aug. 7 shows it to be much brighter than
on the Palomar Sky Survey plates, with an apparently stellar image.
An image-tube spectrogram was obtained by Wills on Aug. 10 with the
270-cm reflector, when the object was visually estimated at magnitude
15.0-15.5.  The spectrum is Seyfert-like, with strong, broad
Balmer emission (H-alpha to H-delta) and sharp [O III] 4959, 5007 A at a
redshift of 0.123 (34 600 km/s)."


JUPITER XIII
     Dr. Elizabeth Roemer, University of Arizona, provides the
following precise position, obtained from a 90-min exposure with the
Steward Observatory's 229-cm reflector on Kitt Peak.  R. A.
McCallister assisted.  Measurer: Carolyn C. McCarthy.

     1975 UT             R. A. (1950) Decl.
     Aug.  7.42060     1 29 21.59   +80 18 19.6


1975 August 19                 (2820)              Brian G. Marsden

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