SNR in ISIS

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David Cejudo
Posts: 45
Joined: Mon Apr 23, 2018 9:01 pm

SNR in ISIS

Post by David Cejudo »

Hello.

In ISIS's profile tab, clicking FWHM a window appears with several calculations.
There are three different values for SNR.
If i am not wrong, the first value is SNR = Average/Deviation

What about SNR (2) and SNR (3)? How are they calculated?

Which of those SNR should be my goal if i want to reach SNR = 100?

Thanks for advice.

David Cejudo.
David Cejudo.
Observatorio El gallinero.
El berrueco, Madrid.
David Boyd
Posts: 161
Joined: Wed Dec 11, 2013 5:50 pm

Re: SNR in ISIS

Post by David Boyd »

Hello David,

This posting by Christian on the Forum should answer your question.

http://www.spectro-aras.com/forum/viewt ... isis#p7177

David
Ken Harrison
Posts: 197
Joined: Thu Oct 25, 2012 5:45 am
Location: St Leonards, Australia
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Re: SNR in ISIS

Post by Ken Harrison »

There's a copy of the DER SNR spreadsheet in the files area of the astronomical spectroscopy group if you want to check it out.
https://groups.io/g/astronomicalspectro ... es/DER_SNR
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before....
"Imaging Sunlight - Using a digital Spectroheliograph" - Springer
http://www.astronomicalspectroscopy.com
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