ESPaDOnS
Exposure Time and Signal-to-Noise Ratio Calculator
Compute
wavelength (nm)
SNR/pixel bin/exp
MagV
T Eff (K)
airmass
seeing "
Observing Mode
Readout mode
Detailed Output?
e-time (seconds)
etime
snr
372
377
384
390
397
404
412
419
427
435
444
453
462
472
482
492
503
515
527
539
552
566
581
596
612
629
647
666
686
708
730
755
781
809
839
871
906
943
985
1029
polarimetric
spectroscopic / star+sky
spectroscopic / star only
slow (noise=2.99e, gain=1.09e/adu, readout/overhead=33s/33s)
normal (noise=3.80e, gain=1.22e/adu, readout/overhead=20s/20s)
fast (noise=4.12ee, gain=1.51e/adu, readout/overhead=20s/20s)
© 2015 Canada-France-Hawaii-Telescope Corporation
Adapted from Eder Martioli's port of Jean-Francois Donati's original software by Claire Moutou and
Billy Mahoney