2
votes
0answers
29 views

need data-point: actual counts per second with APD (avalanche photodiode) detector

I'm designing a sensor system to perform specialized [astronomy and space-sciences] experiments, and need a "reality check" to support or adjust my theoretical calculations. What I need is the ...
3
votes
1answer
58 views

How is the magnitude of a star measured?

How does one measure the brightness of a star?, I did not find anything on the internet.