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Re: Probable SN in NGC 6946

PostPosted: Sat Oct 14, 2017 9:54 pm
by Christian Buil
Excellent and scientific instructive observations of a faint target !


Re: Probable SN in NGC 6946

PostPosted: Sun Oct 15, 2017 3:05 pm
by etienne bertrand
Super James, s'était aussi ma cible hier soir :) la voyant délaissée sur le forum.
La supernova n'est plus trop visible dans la caméra de guidage, pour la repérer il m'a fallut utiliser du binning 3x3 et poses de 10s. (magnitude ~16 / 16.5)

Sur le spectre elle est bien visible mais je suis passé à des poses de 2400s bin1x1
Il y a une grosse bosse vers 7300A qui apparait. A quoi est-elle due ?

Evolution de la SN2017eaw

Ha en absorption arrive à 6453.5A

Vitesse de l'éjecta = -5051km/s

Re: Probable SN in NGC 6946

PostPosted: Sun Nov 26, 2017 9:26 pm
by Robin Leadbeater
SN2017eaw is now V mag 16.3 according to this light curve
Here is an R~130 spectrum from last night using the ALPY200, (black) overlaid on a spectrum from GELATO of another IIP supernova at approximately the same age, SN2004et, which was interestingly in the same galaxy and was one of the first supernovae I ever measured, using a 100 l/mm grating (before the Star Analyser)


sn2017eaw_20171125_GELATO.png (40.75 KiB) Viewed 6273 times

Re: Probable SN in NGC 6946

PostPosted: Wed Nov 29, 2017 1:16 pm
by etienne bertrand
Bravo Robin !
Déjà qu'en Octobre elle n'était pas brillante, là c'est un exploit que de la faire !

Re: Probable SN in NGC 6946

PostPosted: Thu May 24, 2018 10:33 pm
by James Foster
I know this is late, but I'm giving a general spectroscopy talk as the SAS meeting in Ontario California and decided to make an animation of AT2017eaw spectral observation 17May17-19Sep17:


Visual Magnitudes were derived from David Bishop's "Recent Supernova" webpage seen here: