Central Bureau for Astronomical Telegrams
IAUC 4219: SNe
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Circular No. 4219
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
SUPERNOVAE
C. Pennypacker, S. Burns, F. Crawford, P. Friedman, J.
Muller, S. Perlmutter, C. Smith, R. Treffers and A. Williamson,
Lawrence Berkeley Laboratory and University of California; and V.
Junkkarinen, University of California at San Diego, report the
discovery at Leuschner Observatory on May 17 of a mag 14 supernova,
designated 1986I, 36" east and 16" south of the core of NGC 4254
(R.A. = 12h16m3, Decl. = +14deg42', equinox 1950.0). It was fainter than
mag 17 on May 8. Preliminary spectra (600-900 nm) obtained with
the Kitt Peak 4-m reflector indicate that the supernova is of type
II with a broad H-alpha line.
A. V. Filippenko and P. J. McCarthy, University of California
at Berkeley, note that visual observations made with the Lick 3-m
telescope on May 16 revealed no new objects brighter than mv ~ 18
within a few arcmin of NGC 5645. The nucleus of this peculiar Sc
galaxy appears to contain several bright H II regions, but the
supernova (1986H, reported on IAUC 4213) is unlikely to be present.
No spectra were obtained, however.
Filippenko and McCarthy also report that spectra (range 320-
1000 nm, resolution 5-10 nm) of SN 1986E in NGC 4302 (IAUC 4202,
4206) obtained on May 16 with the Shane 3-m reflector at Lick
Observatory show it to be a type II object, roughly two months past
maximum brightness. The strong, broad H-alpha line exhibits a P-Cyg
profile typical of this phase.
L. Rosino, Asiago Astrophysical Observatory, communicates:
"Spectra of SN 1986E obtained by T. Iijima on May 9 and 12 show a
broad HS emission over a moderately strong continuum with a wide,
blue-displaced, P-Cyg absorption. The supernova is therefore of
type II. From the HWMI of the emission feature an expansion
velocity of the ejecta of ~ 4500 km/s is derived; however, the mean
expansion velocity determined by the P-Cyg absorption is -7300
km/s and the extreme velocity -10 000 km/s."
I. Wilson, Center for Astrophysics, reports: "A low-dispersion
spectrum (400-700 nm) obtained by E. Horine using the Z-
machine on the Tillinghast 1.5-m telescope at the Whipple Observatory
indicates that SN 1986E is a type II supernova. The FWHM of
the HS emission line was measured at ~ 13 000 km/s (FWZM ~
20 000 km/s) on May 14 UT."
1986 May 20 (4219) Brian G. Marsden
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