Central Bureau for Astronomical Telegrams
IAUC 4314: 1986l; T Leo; 1982i
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Circular No. 4314
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
COMET WILSON (1986l)
P. Palmer, University of Chicago; I. de Pater, University of
California, Berkeley; and L. Snyder, University of Illinois, report
that OH emission from this comet was observed with the Very Large
Array on Feb. 6 and 7. The maximum of the line profile was
blueshifted by 0.9 km/s, and the total flux was 90 mJy.
Visual magnitude estimate by R. H. McNaught, Coonabarabran,
N.S.W. (20x120 binoculars, twilight): Feb. 17.77, 8.5:.
T LEONIS
M. H. Slovak and M. J. Nelson, Washburn Observatory, University
of Wisconsin, and A. W. Shafter, McDonald Observatory, University
of Texas, report: "High-speed photometric observations of the
dwarf nova T Leo during its latest eruption were obtained with the
McDonald Observatory 0.9-m telescope. Superhumps were discovered
in the lightcurves, establishing the eruption as a supermaximum and
T Leo as a new member of the SU UMa subclass of dwarf novae. The
first superhump observed (peak amplitude was 25 percent of
quiescent level) reached maximum brightness at 1987 Jan. 25.369 UT.
J. A. Mattei, AAVSO, reported that T Leo had attained mv about 10.0 on
Jan. 24.28 and was at mv = 10.1 on Jan. 27, compared to its quiescent
value of V = 15.5 (Shafter and Szkody 1984, Ap.J. 276, 305).
Two consecutive superhumps reached peak brightnesses on Jan. 27.365
and 27.425, respectively, with comparable amplitudes of about 10
percent of the mean-light level, which had fallen by 0.4 mag from Jan.
25. Based on the three timings, the superhump period is about 87.1,
89.8, or 92.6 min. The superhumps, lasting 50-70 min, are asymmetric
with relatively steep ascents to peak and nearly exponential
declines to quiescence."
PERIODIC COMET HALLEY (1982i)
A. Tokunaga, NASA Infrared Telescope Facility, reports the
following magnitudes (+/- 0.05 mag) obtained on Feb. 3 using a 7".3
aperture: 1.25 microns, 14.9; 1.65 microns, 14.6; 2.20 microns, 14.5.
Further total visual magnitude estimates: Jan. 28.80 UT, 13.0
(J. Kobayashi, Kumamoto, Japan, 0.31-m reflector); 31.06, 13.8 (R.
Fleet, Harare, Zimbabwe, 0.35-m reflector); Feb. 6.50, 11.8 (C. S.
Morris, Pyramid Lake, CA, 0.26-m reflector); 7.46, 13.1 (R. Keen,
Mt. Thorodin, CO, 0.32-m reflector); 12.11, 13.7 (Fleet).
1987 February 18 (4314) Daniel W. E. Green
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