[Aavso-photometry] (no subject)

[Keith Graham]

Hi,

 

It is well known that s/n can be improved by stacking images. I was wondering if stacking the same image onto itself would serve the same purpose as stacking several images taken separately. I tried this by saving the same image using different names so I could load them all into my image-processing program and stack them. I did find that my s/n and uncertainty improved immensely. Does anyone know of any reason why I should NOT be doing this to get better photometric measurements on dim variables?  It appears to work just fine, but I could be missing something. 

 

Thanks,

 

Keith Graham