CTIO R-C Spectrograph Exposure Time Calculator
Click on button to change device setting, on device name for HELP.
Filter
Open
C 9780
BG 38
GG 385
GG 455
GG 495
RG 610
Slit width
"
Grating
(l/mm, order, blaze)
G250 158 1 4000
G400 158 1 8000
G510 300 1 10000
KPGL2 316 1 4400
G181 316 1 7500
KPGL3 527 1 5500
KPGL1 632 1 4200
Mirror 0 0 0
CCD Binning
(Dispersion)
CCD Binning
(Spatial)
Seeing
"
Airmass
Moon
Bright
Grey
Dark
Wavelength
Source flux
Flux Units:
Magnitudes
(Johnson)
Max Exposure Time
sec
AB
(Monochromatic magnitudes)
Total Integration Time
sec
Flambda
(ergs/s/cm²/Å)
Desired S/N ratio
per pixel
Fnu
(ergs/s/cm²/Hz)
Calculate S/N for specified Total Integration Time
Calculate Total Integration Time to reach Desired S/N
Tim Abbott (
tabbott@noao.edu
)