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IAUC 3525: 1980o; X-RAY N; H 2252-035

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IAUC number

                                                  Circular No. 3525
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM     Telephone 617-864-5758

     K. S. Russell, U.K. Schmidt Telescope Unit, provides the
following measurements of the ends of a prediscovery trail, identified
on an exposure by A. Savage using a preliminary ephemeris computed
by M. P. Candy, Perth Observatory:

     1980 UT             R. A. (1950) Decl.        m1
     Aug.  9.59988    22 11 52.97   -35 07 54.4    16
           9.64502    22 11 50.75   -35 08 02.5

     Improved elements by the undersigned from arc Aug. 9-Oct. 6:

       T = 1980 May 19.548 ET
   Peri. = 245.447                    e =   0.41635
   Node  =  44.451   1950.0           a =   3.70186 AU
   Incl. =  12.531                    n =   0.138380
       q =   2.16059 AU               P =   7.12 years

The corrections to the ephemeris on IAUC 3523 are: Oct. 8, dR.A. =
0m.00, dDecl. = 0'.0; Oct. 28, +0m.06, +0'.9; Nov. 17, +0m.19, +2'.5.

     M. Oda and the Hakucho Team, University of Tokyo, telex:
"Hakucho discovered that an x-ray nova is active at R.A. = 5h28m +/- 8m,
Decl. = +28o +/- 2o.  The error region includes the recurrent x-ray
transient A0535+262, which is believed to be an x-ray pulsar with a period
of ~ 104 s and to be associated with HDE 245770.  The x-ray flux at
1-12 keV was about the same as the Crab on Oct. 2 and increased to
about 2 Crab on Oct. 7.  The source had been out of the detector
field until Oct. 2."

H 2252-035
     B. Warner and O. Donoghue, University of Cape Town, report that
extensive optical photometry shows the presence of an 805-s period,
agreeing with the x-ray period (IAUC 3514), as well as the 859-s
period previously reported.  The best-fit values for the periods are
805s.4 +/- 0s.2 and 858s.7 +/- 0s.2, and the mean amplitudes are 0.02 and
0.04 mag, respectively.  Individual pulse amplitudes may be up to
0.01 mag.

1980 October 10                (3525)              Brian G. Marsden

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