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https://www.wis-tns.org/object/2021gmj
Discovered today at mag 16 but at only ~11Mpc could potentially get much brighter in the coming days depending on type (A type Ia could reach ~mag 11 in the absence of extinction)
Well placed (It is almost exactly at the zenith at 23:00 for me)
RobinNow classified as a type II. Not surprising for a star burst galaxy I guess
I have it at V = 15.77 ± 0.05, although correct PSF fit is a little difficult.
Observatory: New Mexico Skies at Mayhill, New Mexico – MPC H06
Telescope: 0.50-m f/6.8 reflector + CCD + f/4.5 focal reducer
CCD: FLI ProLine PL11002M CCD cameraFilter is Astrodon V.
Hi Robin,
Very nice supernova spectrum as always. What is the correct way to estimate ejecta velocities along the line of sight from P Cygni profiles? Is it the emission centre to the absorption minimum or to the absorption blue edge?
Cheers
Hugh
I normally just measure the shift of the absorption minimum, either relative to the line rest wavelength corrected for z if known or the emission maximum. I guess there must be higher velocities out to the edge of the line where it meets the continuum but my resolution is so low it would bias the result. It looks like the 13500km/s measured in the very early classification spectrum was based on where the broad H alpha emission met the continuum.
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