SN 1998S was a
type IIn supernova that was detected in
NGC 3877 in March 1998. At the time of discovery, SN 1998S was the brightest type IIn event observed, although later outshone by
SN 2010jl
SN 2010jl was a luminous Type II supernova, type IIn supernova that was discovered on November 3, 2010, in the irregular galaxy UGC 5189A. It is 48.9 ± 3.4 Parsec, Mpc distant from the Solar System. It showed an infrared excess which lasted for o ...
.
It was discovered on 1998 March 2.68
UT in
NGC 3877 by Z. Wan at a broadband (unfiltered) optical magnitude of +15.2.
Its spectrum showed prominent H and He emission lines with narrow peaks and broad wings, superimposed on a blue continuum. These narrow lines indicate the presence of a dense circumstellar medium (CSM) in the vicinity of the supernova. The high luminosity of SN1998S is due to the interaction of fast material (ejecta) with previously-expelled slowly-expanding material (CSM), which can more effectively convert kinetic energy of ejecta into radiation energy.
References
External links
Light curves and spectra on th
Open Supernova Catalog
Simbad* http://www.astro.utoronto.ca/DDO/research/DDOSNe.html
Supernova remnants
Supernovae
Ursa Major
Astronomical objects discovered in 1998
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