Central Bureau for Astronomical Telegrams
IAUC 4226: HD 32918; 1982i; 1986e
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Circular No. 4226
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
HD 32918
R. H. Frater communicates: "O. B. Slee, G. J. Nelson, R. T.
Stewart, A. E. Wright and D. L. Jauncey, CSIRO Division of
Radiophysics, Sydney; J. D. Bunton, University of Sydney; and A. E.
Vaughan, MacQuarie University, report that an intense, 8.4-GHz flare
on the late-type subgiant star HD 32918 (R.A. = 4h59m50s6, Decl. =
-75deg20'44", equinox 1950.0) was observed by the Parkes 64-m
telescope to be in progress on May 31.11 UT. The star was still
flaring when observations ceased on June 9.89 UT. During this interval
the 8.4-GHz flux density varied between 70 and 250 mJy, making
it one of the most luminous stellar events yet observed. Supplementary
observations on June 2 with the Tidbinbilla interferometer
at 2.3 and 8.4 GHz, the Fleurs synthesis telescope at 1.42 GHz and
the Molonglo Observatory synthesis telescope at 0.843 GHz were used
to derive a spectral index of ~ 1. Optical and far-ultraviolet
observations, together with measurements at microwave frequencies
above 8.4 GHz, would be particularly interesting."
PERIODIC COMET HALLEY (1982i)
A. Tokunaga, University of Hawaii, reports the following infrared
magnitudes (diaphragm 7"3, errors < 0.05 mag), obtained at the NASA
Infrared Telescope Facility on May 28.3 UT: 1.25 microns, 11.1; 1.65
microns, 10.7; 2.20 microns, 10.5; 3.45 microns, 10.6; 10.1 microns, 2.3;
microns, 2.3; 20.0 microns, 0.06. The temperature of the thermal emission
was 230 K.
Total visual magnitude estimates: May 7.74 UT, 5.7 (R. Fleet,
Bushmans Nek, Natal, R.S.A., 11 x 80 binoculars; tail 7.0 deg in p.a.
107); 12.12, 6.2 (V. F. de Assis Neto, Sao Francisco de Oliveira,
Brazil, 10 x 70 binoculars); 16.06, 6.4 (de Assis Neto); 19.70,
6.8 (J. Campos, Durban, R.S.A., 0.13-m refractor); 26.36, 7.6
(A. F. A. L. Jones, Stoke, near Nelson, N.Z., 0.08-m refractor);
June 1.05, 7.6 (de Assis Neto; tail 1.0 deg in p.a. 100); 7.20, 7.4
(R. Keen, Mt. Thorodin, CO, 8 x 40 binoculars); 12.19, 7.6 (Keen).
PERIODIC COMET MACHHOLZ (1986e)
Total visual magnitude estimates: May 27.00 UT, 11.2 (M.
Moller, Timmendorfer Strand, West Germany, 0.15-m reflector);
30.97, 11.3 (Moller); June 3.24, 12.3 (D. W. E. Green, Oak Ridge
Observatory, 0.41-m reflector); 7.34, 10: (R. Keen, Mt. Thorodin,
CO, 0.3-m reflector); 10.22, 12.8 (Green); 12.24, 11: (Keen).
1986 June 13 (4226) Brian G. Marsden
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