SN 1998S
| SN 1998S | |
|---|---|
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File:SN1998S.jpg
R-band image of SN 1998S in NGC 3877 obtained on 1998 March 16.1 ut at t he Jacobus Kapteyn Telescope (JKT), La Palma (north is up and east is to the left).
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| Observation data (Epoch J2000.0) | |
| Supernova type | IIn |
| Host galaxy | NGC 3877 |
| Constellation | Ursa Major |
| Right ascension | 11h 46m 06.25s |
| Declination | +47° 28' 55.5 |
| Galactic coordinates | 150.7467 +65.9637 |
| Discovery date | March 2, 1998 by Z. Wan. [1] |
| Peak magnitude (V) | 12 mag |
| Distance | 17 Mpc |
| Physical characteristics | |
| Progenitor | Unknown |
| Progenitor type | maybe Red supergiant |
| Colour (B-V) | ~ 0.2 mag |
| Notable features | SN 1998S, AAVSO 1140+48 |
SN 1998S was a type IIn supernova that was observed in NGC 3877 in March 1998. SN 1998S was the brightest type IIn event observed .[2]
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.[3]
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