Central Bureau for Astronomical Telegrams
IAUC 3767: 1982i; HDE 269858 = RADCLIFFE 127 = SK -69 220; (9)
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Read IAUC 3768
Circular No. 3767
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
PERIODIC COMET HALLEY (1982i)
D. K. Yeomans, Jet Propulsion Laboratory, provides the
following improved orbital elements, derived from 625 observations
over the interval 1835 Aug. 21-1982 Dec. 10:
T = 1986 Feb. 9.44394 ET Epoch 1986 Feb. 19.0 ET
Peri. = 111.84804 e = 0.9672759
Node = 58.14538 1950.0 a = 17.94104 AU
Incl. = 162.23930 n = 0.01296978
q = 0.5871045 AU P = 76.0 years
Perturbations by all nine planets were taken into account. The
nongravitational parameters (Style II) are A1 = +0.06 +/- 0.02,
A2 = +0.0154 +/- 0.0002. W. Landgraf, University of Gottingen,
has remarked on the large correlation between the perihelion time
T and the radial nongravitational-force component A1.
HDE 269858 = RADCLIFFE 127 = SANDULEAK -69 220
N. R. Walborn, Laboratory for Astronomy and Solar Physics,
Goddard Space Flight Center, reports that this extreme Ofpe star
in the Large Magellanic Cloud (Walborn 1977, Ap.J. 215, 53), which
has ejected hydrogen-rich material (Walborn 1982, Ap.J. 256, 452),
was observed to be in a state of outburst on 1982 Dec. 20.2 UT.
Spectroscopic observations (resolution 0.25 nm) with the Cerro
Tololo Interamerican Observatory's 1.5-m SIT vidicon system show a
blue magnitude of 10.2 (more than 1 mag brighter than previously)
and a qualitatively changed spectrum. The Of emission features
and the strong He I P-Cyg profiles (especially at 389 and 447 nm)
have disappeared, while the Balmer emission remains very intense.
Further observations during the current season would be of value
to provide information about the timescale of the phenomenon.
(9) METIS
A. Clegg, D. Mitchell, M. Fanelli and L. Johnson, University
of Virginia, write: " Nine plates of (9) Metis (cf. IAUC 3739,
3753) taken during 1982 Oct. 8-17 with the McCormick Observatory's
0.67-m refractor provide no conclusive evidence for the existence
of an orbiting body. Visual inspections of the plates show no
image elongation, and microdensitometer scans of the 1" (fwhm)
images show no evidence of secondary density maxima."
1983 January 28 (3767) Brian G. Marsden
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