[sjastro]

After years of doing astro imaging, I decided to use my trusty ST-X10ME CCD for a more scientific application.

Using a Star Analyser 200 I obtained a spectrum of the Quasar 3C-273 to highlight the red shift of the various Hydrogen lines of the Balmer series.

Since I am a beginner at this I had absolutely no idea of the exposure times required to obtain a decent S/N ratio.
My intention was on a total 2 hr exposure time but was cut back to one hour (6 X 10 minutes) on a BRC-250 scope due to fog.

While the spectrum is quite noisy I'm pleased with the result as the Hydrogen lines are clearly visible above the noise level.
I'd say it will require at least 4 hours exposure time to get the noise down to respectable levels.
I'll add more data when possible.

Steven