Exposure Time Calculator

The ETC is presently unavailable. Please try again later.


EXTENDED DOWNTIME: MONDAY 28 NOV - FRIDAY 2 DECEMBER

The ETC will be down for maintenance and update the week after Thanksgiving, currently estimated to extend over the full workweek, Monday-Friday. Please watch the Announcements at jwsthelp.stsci.edu where we will post updates to this schedule.

The ETC will come back up running ETC 2.0, which will incorporate commissioning results.


While the ETC is down for maintenance, you can