Central Bureau for Astronomical Telegrams
IAUC 4253: 1986K; 1986l; NSV 6708
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Circular No. 4253
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
SUPERNOVA 1986K IN ANONYMOUS GALAXY
P. Rafanelli, Institute of Astronomy, University of Padua,
reports: "Spectrograms (range 380-750 nm, resolution 1 nm) obtained
at La Silla with the ESO 1.5-m telescope show the supernova to be
of type II. H-alpha has a P-Cyg profile. The blue edge and the deep
minimum of the H-alpha absorption correspond to expansion velocities of
12 000 and 6000 km/s, respectively. The H-alpha emission is very strong
and broad (FWHM = 7000 km/s, FWZI = 17 000 km/s), as is often the
case in type II supernovae more than a few weeks past maximum
brightness. Strong absorption features are observed at 483 (H-beta),
493, 501, 517, 578, and 586 (Na I) nm. A short-exposure spectrum
of the parent galaxy shows narrow H-alpha and Si I emission lines. The
measured redshift is z = 0.004."
COMET WILSON (1986l)
S. Larson and D. Levy, Lunar and Planetary Laboratory, report
that 300-930-nm long-slit spectra taken with the 1.5-m Catalina
reflector on Sept. 2.3 and 3.3 UT show a strong dust continuum. The
only emission was CN (388 nm), which extends at least 1' from the
nucleus. Direct CCD images show a well-defined asymmetric dust coma
54" (96 500 km) in diameter with a 77" tailward extension to the
east; a sharp sunward boundary is seen 16" from the central
condensation. A jetlike feature extends north from the nucleus, curving
east to the edge of the coma. No change was seen over the 2 days.
Further total visual magnitude estimates (instrument type: R =
refractor, L = reflector): Aug. 25.19 UT, 11.2 (A. Cook, Whitaker
Peak, CA, 0.32-m L); 27.26, 10.6 (C. Spratt, Victoria, BC, 0.20-m
L); 29.12, 12.2 (J. E. Bortle, Stormville, NY, 0.32-m L); 30.12,
11.3 (D. W. E. Green, Amherst, MA, 0.46-m R); 31.88, 11.3 (M. V.
Zanotta, Milan, Italy, 0.30-m L); Sept. 1.21, 11.6 (J. V. Scotti,
Tucson, AZ, 0.40-m L); 2.88, 12.0 (J.-C. Merlin, Le Creusot,
France, 0.40-m L); 4.60, 11.5 (A. Tominaga, Sendai Observatory,
0.16-m L); 7.12, 11.6 (Bortle); 8.21, 10.0 (Spratt).
NSV 6708
Further visual magnitude estimates (cf. IAUC 4245), by V. F.
de Assis Neto, Sao Francisco de Oliveira, Brazil: Aug. 2.95 UT,
7.6; 4.01, 7.6; 5.07, 7.6; 8.04, 7.6; 10.05, 7.6; 17.98, 7.6;
24.96, 7.5; 28.92, 7.5.
1986 September 15 (4253) Daniel W. E. Green
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