Central Bureau for Astronomical Telegrams
IAUC 3398: WZ Sge; NGC 6543 AND V Sge; 1972 RA
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Read IAUC 3399
Circular No. 3398
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
WZ SAGITTAE
J. Middleditch and J. Nelson, Lawrence Berkeley Laboratory,
University of California, write: "Time-resolved broadband optical
observations of WZ Sge in its post-outburst state (cf. IAUC 3311)
on five nights in July using the 0.9-m telescope at Kitt Peak
National Observatory reveal optical pulsations with a period of
28s.952 +/- 0s.004 and pulsed fraction of 0.0023 +/- 0.0002 mag. This
period differs from the 27s.866 period seen prior to the 1978 Dec.
outburst but matches the 28s.97 period claimed by Robinson et al.
(1978, Ap. J. 219, 168) from 1971 and by Patterson (preprint).
Since the star is ~ 0.7 mag brighter than its pre-outburst mag of
14.7, the pulsation intensity near 28s.95 has increased tenfold from
before the outburst, and it is now comparable to the pre-outburst
intensity for the 27s.87 pulsations, whose current intensity is
0.0007 mag pulsed fraction."
NGC 6543 AND V SAGITTAE
J. Patterson, University of Texas at Austin, writes: "Periodic
drive errors at 48, 16 and 8 sidereal seconds have been found in
the McDonald 0.9-m telescope. The periodicities claimed in NGC
6543 and V Sge (IAUC 3377, 3134) should therefore be disregarded.
The origin of the periodic error is not known but is thought to be
in the electronic frequency synthesizer.
1972 RA
This Amor-type object has been recovered as follows:
1979 UT R. A. (1950) Decl. B Observer
Aug. 23.48861 2 44 38.12 +15 57 27.2 17-17.5 Helin
23.50139 2 44 43.11 +15 57 27.7
31.30675 3 26 50.39 +15 38 34.9 18 Schwartz
Sept. 1.27693 3 32.1 +15 32 18 Shao
E. Helin (Palomar Mountain Observatory). 1.2-m Schmidt telescope.
Measurer: D. Janke. Beginning and end of trail.
G. Schwartz and C.-Y. Shao (Harvard College Observatory. Agassiz
Station). 1.5-m reflector. Measurer: Shao.
The indicated correction to the prediction (MPC 4659, 4666) is
Delta-T = +0.07 day.
1979 September 4 (3398) Brian G. Marsden
Read IAUC 3399
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