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the most common named objects seen from the northern hemisphere.
Background Sky
Background Sky
Surface Brightness rough equivalence to the Bortle Scale. Lower SB numbers are brighter, while lower Bortle numbers are darker.
Bortle 9 = SB 17.5
Bortle 8 = SB 18
Bortle 7 = SB 18.5
Bortle 6 = SB 19
Bortle 5 = SB 20
Bortle 4 = SB 21
Bortle 3 = SB 22
Bortle 2 = SB 23
Bortle 1 = SB 24
For instance if you live in a Bortle 7 area don't expect to see objects with a Surface Brightness higher than 19. Given enough long exposures and the proper filters you can capture them but you will not see them through the camera.
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