Robin
Light polluted city - which spectroscope?
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Robin Leadbeater
- Posts: 1952
- Joined: Mon Sep 26, 2011 4:41 pm
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Re: Light polluted city - which spectroscope?
Yes the optimum slit width must be different depending on the sky background level. For the ALPY with a rather wide fixed slit, a higher focal ratio than f4 might be better for faint objects with a high sky background. An interesting calculation
Robin
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
http://www.threehillsobservatory.co.uk
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Ken Hudson
- Posts: 18
- Joined: Thu Oct 06, 2011 4:02 pm
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Re: Light polluted city - which spectroscope?
Hi All,
Thank you very much for the thoughtful answers! When I posted this I didn't expect there would be so many factors to consider but, as always, it was an opportunity for me to learn something new. At some point, we may leave our dark sky location and move to someplace that is more light polluted. Probably not as bright as Valerie's location in the center of Paris but maybe still bright. Anyway, it sounds like I'll be able to make either low res or high res work which is great news. Thanks again!!
Cheers,
Ken
Thank you very much for the thoughtful answers! When I posted this I didn't expect there would be so many factors to consider but, as always, it was an opportunity for me to learn something new. At some point, we may leave our dark sky location and move to someplace that is more light polluted. Probably not as bright as Valerie's location in the center of Paris but maybe still bright.
Anyway, it sounds like I'll be able to make either low res or high res work which is great news. Thanks again!!Cheers,
Ken