RE: Stacking

["Bob Dubner" <rdubner@bellatlantic.net>]

Unless there is something going on that I don't understand, I think you've
made a mistake.

Signal to noise generally goes down as the square root of the number of
samples, not linearly.

It's still worth doing; it's just that it is worth a factor of 2.8, not 8.

>
> Just for fun I used Image Scientist to stack 8 images from Data Set
> 20.  The result was as expected.  A reduction of signal to noise of the
> square root of 8.  It seems to me that this is worth doing.  This
> gives the
> equivalent of an eight hundred second exposure.  There are more
> stars to be
> found at any one S/N setting.  It did not seem to take all that long.
>