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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