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72495Re: [ccd-newastro] Another Q: Dark Noise/Dark Current

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  • Ron Wodaski
    Mar 15 5:58 PM
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      No, read noise would not be a factor. The noise inherent in the unwanted signal (the bright sky) would utterly swamp read noise as a factor.

      it would simply be a matter of exposing long enough to make the small difference in brightness between the sky and the target resolve into an image by accumulating signal the old-fashioned way: by overcoming the shot noise with lots of data.

      Ron Wodaski



      On Mar 15, 2013, at 4:39 PM, geoff <ghsmith45@...> wrote:

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      > --- In ccd-newastro@yahoogroups.com, "Stan" <stan_ccd@...> wrote:
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      >> One could image M33 in daylight but it would require a humongous amount of time/signal to overcome the sky flux (probably at least a few weeks worth).
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      >> Stan
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      >> (edited for typos)
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      > Not to mention the fact that you would need very short exposures to avoid saturating the camera with sky signal, so read noise would also be a big factor. Still, if someone had time on their hands it would be an interesting project--maybe try a bright open cluster, rather than a faint galaxy.
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