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IAUC 3996: 1982i; 2S 0142+61; VZ Scl

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IAUC number 

                                                  Circular No. 3996
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 617-495-7244/7440/7444


PERIODIC COMET HALLEY (1982i)
     The following precise positions have been reported.  Now that
the comet is bright enough to be observed by conventional methods,
further positions will be published only in the MPCs.

   1984 UT           R.A.  (1950.0)  Decl.      m1    Observer

   Sept.22.80382    6 46 17.0    +13 02 48     20.5   Seki
        25.4972     6 46 23.82   +12 59 21.0   21.3   Spinrad
        26.79097    6 46 25.8    +12 57 45     20.5   Seki
        27.4903     6 46 26.07   +12 56 48.5   20.3   Spinrad

T. Seki (Geisei).  Communicated by S. Nakano.
H. Spinrad and S. Djorgovski (Kitt Peak National Observatory).
   4-m reflector with prime-focus CCD camera.  Reduced by M. J. S.
   Belton.  A faint aymmetric coma extends from the nucleus for ~
   6" to the north.  The image is highly concentrated about the
   center of light, and the coma is faint.  Magnitudes are with an
   R filter (with variable haze present on Sept. 25).


2S 0142+61
     N. E. White, P. Giommi and A. N. Parmar, EXOSAT Observatory,
European Space Operations Center; and F. E. Marshall, Goddard
Space Flight Center, write: "A 13-hr observation on Aug. 27 shows
the x-ray flux of 2S 0142+61 to be modulated with a period of 1456
+/- 6 s. The 1-10-keV spectrum has two components, with a 0.7-keV
thermal and a 0.0-energy-index power law, 30 percent of the total
luminosity being in the thermal component.  The spectrum is
absorbed by 10**26 H m**-2.  Only the hard component is pulsed, the
3-10-keV peak-to-mean amplitude being 35 percent.  Below 2 keV the
sinusoidal modulation is less than a few percent.  The total
1-10-keV luminosity is 3.5 x 10**25 J/s for a distance of 100 pc."
The position is not inconsistent with the Einstein position.


VZ SCULPTORIS
     B. Warner, Department of Astronomy, University of Cape Town,
reports the nova-like variable VZ Scl (Warner and Thackeray 1975,
MNRAS 172, 433), normally at V = 15.6, to be fainter than V = 18
on Sept. 23.  VZ Scl therefore similar to cataclysmic variables
like MV Lyr.  As it has deep eclipses at normal light, photometric
and spectroscopic observations at minimum should be undertaken.


1984 October 1                 (3996)              Brian G. Marsden

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