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IAUC 2934: 1976e; 1976f; X-RAY SOURCES

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IAUC number 

                                                  Circular No. 2934
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
Western Union: RAPID SATELLITE CAMBMASS


PERIODIC COMET D'ARREST (1976e)
     E. Roemer, University of Arizona, reports that she and C. A.
Heller have recovered this comet on exposures with the Steward
Observatory's 229-cm reflector, Kitt Peak, as shown below.  The
images are too weak (especially on Feb. 25) to show cometary character.
The indicated correction to the ephemeris on IAUC 2900 is Delta-T
= +0.04 day.  A satisfactory ephemeris can be obtained from 0.25 A
+0.75 B, where A and B represent the coordinates given on IAUC
2900 and in Handb. Br. Astron. Assoc. for 1976, respectively.

     1976 UT          R. A. (1950) Decl.       m2
     Feb. 25.48368   16 24.12    - 3 05.2    ~21.5
          25.52338   16 24.17    - 3 05.1
     Mar. 25.44230   17 08.11    + 0 07.8    ~20.6
          25.48575   17 08.17    + 0 08.3


PERIODIC COMET PONS-WINNECKE (1976f)
     Weak, but definite, images of this comet have also been recorded
by Roemer and Heller.  The following recovery positions are
in very close agreement with the prediction on IAUC 2880.

     1976 UT          R. A. (1950) Decl.       m2
     Mar. 25.21281    9 24.94    +41 124     ~21.0
          25.25622    9 24.91    +41 12.3


X-RAY SOURCES
     The Ariel 5 Group, University of Birmingham, reports that a
transient x-ray source, designated A1743-29, appeared on Mar. 22 at
about 150 Uhuru units.  Its position is R.A. = 17h43m01s, Decl. = -29o31'
(equinox 1950.0); the radius of the error circle is 5'.

     M. Watson, X-Ray Group, University of Leicester, reports: "Analysis
of observations of Aql X-1 (3U 1908+00) between 1975 June 30
and July 9 by the Ariel 5 Sky Survey instrument (during the x-ray
flare decay; cf. IAUC 2788) shows good evidence for a period of
1.30 +/- 0.04 days.  Zero phase was on 1975 June 30.13 +/- 0.15 UT, and
the modulation persisted clearly over 3 or 4 cycles."


1976 March 29                  (2934)              Brian G. Marsden

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