Signal-to-Noise Calculator
Exposure Time
SNR
k is the magnitude zero point. ADUs are computed using the GRIM II (mid-90s) value of 4.73 e
-
/ADU.
object size (pixels)
readout noise (e
-
/pixel)
k (phot/s/cm/cm/Å)
object magnitude
sky brightness (mag/arcsec
2
)
filter bandwidth (Å)
pixel area (arcsec
2
)
system efficiency
ND# (e
-
/phot)
telescope area (cm
2
)