Input any two (S/N, magnitude, exposure time) and obtain the remaining value.
Mode: Exposure time for a given S/N and magnitude. Please provide: Magnitude: S/N ratio (> 0.1): S/N for a given exposure time and magnitude. Please provide: Magnitude: Exposure Time (s) (> 0.001): Magnitude for a given S/N and exposure time. Please provide: S/N ratio (> 0.1): Exposure Time (s) (> 0.001):
Bandpass: U B V R I VR Hα-on Hα-off [OIII] WR u' g' r' i' z' yish
Telescope/Instrument: DCT/LMI Hall/NASA42
CCD Binning Factor: 1 2 3 4
Seeing (arcseconds): 0.6 0.8 1.0 1.2 1.5 2.0 2.5
Lunar Phase (days): 0 (new moon) 1 2 3 4 5 6 7 (first/last quarter) 8 9 10 11 12 13 14 (full moon)
Airmass: 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4
Created by Phil Massey and Kathryn Neugent
Basic equations and assumptions can be found here.