Click on a button to change a setting. Or, follow a link for HELP.
| Filter | Grating l/mm | ||
| Wavelength um | Source flux | ||
| Flux Units: | Magnitudes (Johnson) | ||
| Flambda (ergs/s/cm²/um) | |||
|
Desired S/N ratio
(per pixel) |
|
||
|
Exposure Time
(seconds) |
|
||
| Calculate S/N for specified Total Integration Time | |||
| Calculate Total Integration Time to reach Desired S/N | |||