How much more time do you need from a bright site?

Compare two observing sites by SQM reading to see how integration time trades off against sky brightness, adjusted for your target and filter type.

Inputs

Site A Name

Site A SQM

Site B Name

Site B SQM

Known Integration Time

Time Unit

Known Time Is For

Target Type

Filter Type

Results

Adjust the inputs to see results.

Pogson magnitude scale (N. Pogson, 1856): brightness ratio = 10^(0.4 × ΔSQM). Adjusted for target/filter sensitivity.

All formulas verified by automated tests.