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Space/Science

A new supernova in M74

From the IUAC:

SUPERNOVA 2003gd IN M74
R. Evans, Hazelbrook, N.S.W., reports his visual discovery
with a 0.31-m reflector of an apparent supernova (mag about 13.2)
on June 12.82 UT, located on top of the southern spiral arm of the
galaxy, 20" east and 150" south of the center of M74 = NGC 628. R.
H. McNaught, Australian National University, reports confirmation
of the new object (red mag 13.9) on images taken on June 13.84 with
the 1.0-m telescope at Siding Spring Observatory, with a precise
position measured as R.A. = 1h36m42s.65, Decl. = +15o44'20".9
(equinox 2000.0; poor fit with about 50 USNO-A2.0 stars;
uncertainties +/- 0".6 in R.A., +/- 0".3 in Decl.), which is 13".2
east and 161" south of the center of M74. A foreground star of red
mag 12.4 has position end figures 32s.00, 45'08".7. McNaught adds
that SN 2003gd is absent from Digitized Sky Survey images.
P. Garnavich, University of Notre Dame; and E. Bass, Cornell
University, obtained near-infrared spectra (range 850-2400 nm) of
SN 2003gd in twilight on June 13.46 UT with the 1.8-m Vatican
Advanced Technology Telescope (+ CorMASS spectrograph; low-
dispersion echelle design). Preliminary reduction of the J-band
order shows strong, broad emission of Paschen_beta and
Paschen_gamma, which confirms that this is a supernova and
indicates it to be a type-II event.

M74 :

http://www.maa.agleia.de/Messier/Jpg/m74.jpg


Raoul

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