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IAUC 3850: 1983m; GK Per; Occn OF 14 Psc BY (51)

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IAUC number 

                                                  Circular No. 3850
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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


PERIODIC COMET WOLF (1983m)
     J. Gibson informs us that he has recovered this comet with
the 1.2-m Schmidt telescope at Palomar as follows:

     1983 UT             R.A.    (1950.0)     Decl.       m2

     Aug.  1.23479      18 16 41.11      +14 04 45.2      20
           3.21257      18 15 45.60      +13 54 31.4

The object is essentially stellar in appearance and close to the
prediction by E. I. Kazimirchak-Polonskaya (MPC 7659, 7666).


GK PERSEI
     M. G. Watson and A. Smith, University of Leicester, and the
EXOSAT Observatory Team report the discovery of a 351-s periodicity
in GK Per.  This 1901 nova, which is currently having a minor
optical outburst (IAUC 3840, 3848), was observed for 7.5 hr during
Aug. 9.17-9.48 UT with the Medium Energy Experiment on board
EXOSAT.  A preliminary analysis gives for the x-ray minima the
ephemeris JD 2445555.6737 (+/- 0.0002) + 0.004066 (+/- 0.000001) E.
The x-ray modulation is approximately sinusoidal, with 50 percent
pulse fraction (zero-to-peak ratio of the pulse-signal amplitude
to the full amplitude).  The mean 2-10-keV x-ray flux was ~ 7 ;Jy,
indicating an x-ray brightening correlated with the current optical
outburst.  For information concerning future EXOSAT observations
of GK Per, contact the Observatory Team at ESOC, Darmstadt:
telephone 49-6151-886705, telex (West Germany) 419453 ESOC D.


OCCULTATION OF 14 PISCIUM BY (51) NEMAUSA ON 1983 SEPT. 11
     IAU Commission 20 Occultations Working Group Bull. No. 31
contains an alternative prediction for this event (cf. IAUC 3834).
This prediction, derived by G. E. Taylor, Royal Greenwich Observatory,
from astrometry by A. R. Klemola at Lick Observatory on June
17, gives for the central line (west longitude, north latitude):

    UT         Long.     Lat.      UT         Long.     Lat.

    7 43 03    48.80    45.32      7 48 03   102.51    20.18
    7 44 03    68.31    39.43      7 49 03   108.42    15.88
    7 45 03    79.95    34.16      7 50 03   114.01    11.69
    7 46 03    88.75    29.26      7 51 03   119.44     7.57
    7 47 03    96.06    24.62


1983 August 12                 (3850)              Brian G. Marsden

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