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Spectrum of SN2020hvf in NGC 3643

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About this observation
Observer
David Strange
Time of observation
11/05/2020 - 21:55
Object
SN2020hvf
Observing location
Salcombe Regis
Equipment
C9 + ZWO ASI 183MM
SA100
Exposure
30x30s
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Comments

allenhugh10's picture

Hi David,

Nice spectrum of the supernova. To calculate the line of sight expansion velocity, don't forget to include the galaxy redshift in the calculation. NED is a good source http://ned.ipac.caltech.edu/byname?objname=NGC%203643&hconst=67.8&omegam... So the wavelength of the Si II absorption line is actually bluer than your measurement by the redshift of the galaxy. This will make your expansion velocity even higher!

Cheers

Hugh

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