A quick guide to the Exposure Time Calculator

Keep in mind that the ETC for JWST is an exposure time calculator which does not compute any exposure time. You will have to go through a trial and error procedure to adjust the number of groups, integrations, and exposures detailed in the previous section, in order for your observation to reach the SNR you need for your science. 


Step 1

Getting started with the ETC

Step 2

Defining your targets

Step 3

Defining your observing strategy