Central Bureau for Astronomical Telegrams
IAUC 3404: Sco X-1; 1979h
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Read IAUC 3405
Circular No. 3404
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
SCORPIUS X-1
B. Cooke, Leicester University; L. Petro, Massachusetts Institute
of Technology; and J. van Paradijs, University of Amsterdam,
announce a worldwide x-ray/optical study of Sco X-1. X-ray
observations will be made with the Ariel-6 satellite during 1980 Apr.
15d12h-27dl2h UT. The x-ray detectors operate between 1 and 20 keV
with 0.3-s time resolution. During the 1979 coordinated SAS-3
study of Sco X-1 (IAUC 3327) flares were observed that contained
unresolved structure at a 1-s timescale and that were well correlated
with optical flares. The goals of the present study are to
resolve the rapid x-ray flares and to investigate the variation of
the optical flare lag as a function of binary phase. Optical observers
who can make 0.1-1.0-s time resolution photometric or 3-10-s
time resolution spectroscopic observations are urged to participate
in this project and, to request telescope time for the above
period. For coordination of observing schedules and further
information prospective participants should telephone or telex one of
the organizers: Cooke, telephone U.K. 0533-554455, telex 341664
LUXRAY G; Petro, telephone U.S. 617-253-3169, telex 92-1473 MIT CAM;
van Paradijs, telephone Neth. 020-5223004, telex 16460 ZELAB NL.
COMET KOWAL (1979h)
No further observations have been reported, but they are urgently
needed. The first ephemeris below is an extension of that
on IAUC 3397; the second is from a representative elliptical orbit.
Orbit 1 Orbit 2
1979 ET R. A. (1950) Decl. R. A. (1950) Decl.
May 27 19 54.2 -16 08 19 45.8 -16 57
June 6 19 51.6 -16 15 19 46.1 -16 50
16 19 47.5 -16 28 19 44.3 -16 50
26 19 42.2 -16 45 19 40.8 -16 58
July 6 19 36.3 -17 06 19 35.8 -17 11
Sept. 4 19 12.2 -19 08 19 15.5 -19 14
14 19 12.7 -19 20 19 18.6 -19 26
24 19 14.6 -19 29 19 24.0 -19 33
Oct. 4 19 17.7 -19 34 19 31.4 -19 34
14 19 22.0 -19 36 19 40.6 -19 27
1979 September 14 (3404) Brian G. Marsden
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