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Originally Posted by ChrisV
I've got a great park near home which is on the edge of a north facing ridge that drops off to national Park. Nearest lights are Gosford 40kms away. At what altitude did yours subs start to get crappy? Just wondering how much I can get in a night.
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Chris, it never rose more than about 10 degrees and I reckon it would be visible for about 2-3 hrs but by the time it is at 5 degrees and lower, in the haze makes it not worth photographing. If not for some trees, I think I could have got a little over an hour of useable data on it. You being further north, should achieve a little longer than that. Best to get on one of those free online planetarium programs. Type in your location, latitude and longitude and the time you'd be observing. Move the view to face north so you can simulate the path of M31 across the sky. You'll get an idea of how long it remains at a useful altitude to photograph from where you're set up.