Algorithm based on the IRAF task ccdtime
Last Update: Feb 03 2004
Telescope:
Instrument:
Filter:
Magnitude: (must be between -5 and 35)
Signal/noise: (must be between 0 and 100,000)
CCD Binning:

Seeing (arcsecs): (must be between 0 and 5)
Airmass: (must be between 1 and 3)
Lunar Phase:
Your observation will require approximately seconds to complete.
Star counts:        Sky counts/pixel: Noise Contributions: Star     Sky     CCD