Sky background level measuring with ASTAP

It is relatively easy to measure sky background level with an astroimaging setup accurately. It can be then used to calibrate the sky brightness sensor.
You need to have:
– setup with a monochromatic camera and luminance filter
– proper software – for example ASTAP

First, download and install ASTAP software and star database (H17 is okay) https://www.hnsky.org/astap.htm .
Then take a 1-2 minute shot with a camera and L filter.
Open the file in ASTAP software.
Solve it (press Solve button).
Select Tools -> SQM Measurement. The only value you need to enter is the pedestal – that is the mean value of the corresponding dark frame. The SQM value is displayed directly:

SQM measuring with ASTAP

Happy measuring!