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IAUC 3084: 1960 UA; 1976 AA; OPTICAL CANDIDATES FOR X-RAY SOURCES

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IAUC number 

                                                  Circular No. 3084
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     Telex: 921428
Telephone: (617) 864-5758


1960 UA
     This near-Apollo-type object has been recovered by G. Schwartz
and C.-Y. Shao on exposures obtained with the 155-cm reflector at
the Harvard College Observatory's Agassiz Station as shown below.
These observations indicate that the prediction by B. G. Marsden on
IAUC 3065 requires correction by Delta-T = +0.03 day.  Measurer: Shao.

     1977 UT             R. A. (1950) Decl.       mpg    Observer
     June 16.21652    18 04 40.13   -15 32 07.4   19     Schwartz
          23.28484    17 55 12.76   -14 52 36.6          Shao


1976 AA
     The following precise positions have been measured by J. H.
Bulger from exposures by the same observers:

     1977 UT             R. A. (1950) Decl.        Observer
     Mar. 22.39044    20 25 08.10   +24 20 57.3    Schwartz
     Apr. 19.34881    22 13 32.14   +12 44 52.4    Shao


OPTICAL CANDIDATES FOR X-RAY SOURCES
     J. E. McClintock, Massachusetts Institute of Technology, reports
that he has discovered at Cerro Tololo Interamerican Observatory
a possible optical counterpart of 3U 1735-44, which has been
identified with the burst source MXB1735-44 = KGX 345-6 (IAUC 3075)
and is currently under scrutiny during a worldwide watch of x-ray
bursters (IAUC 3078).  The object, located (with an uncertainty of
+/- 3") at R.A. = 17h35m19s.0, Decl. = -44o25'19" (equinox 1950.0), is near
the center of the 2o-radius error circle given for 3U 1735-44 (2S
1735-444) by Jernigan et al. (to be submitted to Nature); it is
designated as star No. 5 in their finding chart of the region.  The
object has a large ultraviolet excess, its photometric parameters
(+/- 0.10 magnitude) being V = 17.5, U-B = -0.85, B-V = +0.20.

     J. van Paradijs, B. Hidajat and H. Hendricks, Bosscha Observatory,
suggest for the optical counterpart of 3U 1626-67 (IAUC 3054)
a variable star situated 20" northeast of a thirteenth-magnitude
star at R.A. = 16h26m46s, Decl. = -67o21'.6 (equinox 1950.0).  Kodak 103a-D
exposures on June 11.76 and 14.68 UT show a brightness variation of
at least one magnitude, between about magnitudes 17 and 18.


1977 June 24                   (3084)              Brian G. Marsden

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