W. S. Penhallow, Quonochontaug Observatory, has measured the following precise position from a 20-min exposure with the 0.4-m astrometric reflector on June 4: R.A. = 12h16m19s65, Decl. = +14deg41'23"4 (equinox 1950.0). W. Wenzel, Sonneberg Observatory, reports photographic magnitude estimates by A. Jager: May 12.9 UT, [16.0; 26.9, 14.0. R. Kirshner and I. Wilson, Center for Astrophysics, report: "Low-dispersion spectra (range 480-700 nm) obtained by E. Horine and J. Peters using the Z machine on the Tillinghast 1.5-m telescope at the Whipple Observatory indicate that the supernova in NGC 4254 = M99 is of type II. The FWHM of the HS emission line was measured at ~ 9100 km/s (FWZM ~ 14 600 km/s) on June 7. The H-alpha profile is noticeably asymmetric toward the red."
International Astronomical Union Circular
- Pub Date:
- June 1986