LCOGT Exposure Time Calculator

For 2m, 1m and 0.4m   Usage Hints

Choose Filter, Airmass, Moon Illumination and Telescope Aperture,
then CLEAR one of and Adjust TWO of S/N, Magnitude, Exposure Time (sec).
Program calculates ExpTime if S/N and Mag set, Mag if S/N & ExpTime are set, and S/N if Mag and Exptime are set.

ApDiameter should be about 3x expected seeing in arcsec.
PkDN is an estimate of the peak DN for the given exposure, aperture/seeing. Saturation may occur if PkDN>40,000.
[Set Resolution>10 to estimate values for a spectrum of the requested resolution, in band, with specified Throughput]

Inputs

 S/N  Magnitude  ExpTime(sec)  Filter U B V Rc Ic u g r i Zs Y  Moon Dark Half Full  Telescope 40cm 1-M 2-M

 Dark/sec  RON  Gain  ApDiameter''  AirMass  Resolution  SpectQE

Press the button to display updated values.