Welcome to the SOFIA - EXES Exposure Time Calculator
VERY IMPORTANT: For SOFIA proposals, enter the
time, not the integration time, as overheads depend on observing details and are captured in the ETC clock time.
Enter either the rest-frame wavelength OR the rest-frame wavenumber to be observed:
[4.5 - 28.5 micron, or 350 - 2220 cm^-1]
Check here to apply a Doppler shift:
and enter the velocity:
[km/s, negative if the source is approaching]
Note that observations of features near strong telluric features can change dramatically with Earth's orbital motion. One available tool is (link should open new window or tab)
GBT's VLSR Calculator
. To use, add the source VLSR to the correction calculated for a given date.
Next, select the instrument mode from the options below:
Single-order Long Slit Medium
Single-order Long Slit Low
Click the submit button to continue on to the next step:
Click here for the ETC user manual & documentation.
Exposure time calculator created by Benjamin Cain. Maintained by Matt Richter. Last updated 17 Jun 2015.