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Je trouve un décalage de de 6.4 angströms vers le bleu si j'utilise les raies du sodium mais seulement 3 angströms si je prends la raie à 5167.3 du magnésium. Donc une vitesse moyenne de 235 km/s.
Je ne suis pas certain qu'on puisse voir le doublet du sodium avec un alpy (pouvoir de résolution de 10 ...

Thank you Etienne.
Your are right it was a hot pixel.

Spectre M31.jpg

Hi All,
There is a strange emission ray in my M31 Spectrum taken with Alpy 600. After accurate calibration it is found to be at 4853 angstrom. Could it be Hbeta or Argon?
The conditions where not good: full moon and fog.
I will try to take it again in better condition but I am ...

Hi All,
Sorry for the previous message. In fact my pixel size was wrong by a factor of 10.
Now it works.

Robin

Hi All,

Anybody could tell me why I get this error message when I want to calibrate a Spectrum with Isis?

Regards
Robin

Hello everybody,

My name is Robin (but I am french). I live in South West of France about a hundred km north east of Biarritz. I am chemical engineer but my hobby has always been astronomy.
I have mainly done astrophoto untill now with a Paramount MEII + GSO 16" + starlight Xpress SX694 and ...