Quote:
Originally Posted by rogerg
I wonder what those in the know think of this magnitude estimate?
Camera is NABG, ST8.
Taken from a single reduced 3 minute exposure.
The rest is probably self evident from the screen shot.
Roger.
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Roger
What filter if any was the image taken with?
I forget what database astrometrica uses for comp stars but it is different to the standard stars on the AAVSO site. These are probably better to use as they are reproducable betreen observers.
The aperture needs to be bigger. I usually use 3 or 4 x the fwhm as this gives more reproducable results.
Cheers
Terry