Central Bureau for Astronomical Telegrams
IAUC 5884: ORIONID METEORS 1993; V1413 Aql; 1993J
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Circular No. 5884
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
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MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)
ORIONID METEORS 1993
P. Brown, University of Western Ontario, writes: "Unusually
high activity has been reported from visual and photographic
observers in Germany and the Netherlands of the Orionid meteor stream
prior to its regular maximum. According to the International Meteor
Organization (IMO), the regular maximum was predicted for Oct.
21.7 UT, while the outburst was recorded in the 2-hr interval centered
around Oct. 18.1, with observers reporting uncorrected hourly
rates of 25/hr. This corresponds to zenith hourly rates approaching
35/hr, some 3-4 times the regular activity of the Orionids at
this solar longitude. The maximum Orionid ZHR over the past few
years, according to the IMO, is about 20."
V1413 AQUILAE
U. Munari, Asiago Astrophysical Observatory; and B. F. Yudin,
Astronomical Observatory, Moscow, write: "The eclipsing symbiotic
nova V1413 Aql = AS 338 is entering a new outburst phase. Compared
with similar observations made in June, echelle spectroscopy (range
450-700 nm) performed on Oct. 27.75 UT with the Asiago Observatory
1.82-m telescope (+ CCD) shows the disappearance of He I, He II,
and [O III] emission lines. Only faint hydrogen Balmer lines remain
visible. The star has been on a smooth decline since its 1982
outburst (cf. Munari 1992, A.Ap. 257, 163), and in 1990 it was
observed at V = 13.0, B-V = +1.00, U-B = -0.20 (cf. Munari et al.
1992, A.Ap. Suppl. 93, 383). Photoelectric photometry performed on
Oct. 27.85 by G. Sostero and A. Lepardo with the 0.45-m telescope
of the Associazione Friulana di Astronomia e Meteorologia gives V =
11.2, B-V = +0.65."
SUPERNOVA 1993J IN NGC 3031
J. A. Phillips and S. R. Kulkarni, California Institute of
Technology, report: "Using the five-element millimeter interferometer
at the Owens Valley Radio Observatory, we have continued monitoring
the flux density of SN 1993J at a frequency of 99.4 GHz:
Sept. 12, 13 +/- 2 mJy; Oct. 9, 8 +/- 2 mJy. Our flux scale was
established by observations of Neptune and Uranus. The 99-GHz flux
density was nearly constant at 18 mJy from Apr. 11 until July 2
(IAUC 5763, 5775). The flux is now decaying and is indicative of
optically thin expansion."
1993 October 28 (5884) Daniel W. E. Green
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