ACS Anneal Dates

Anneal Dates

ACS Annealing

This page contains a listing of all past and future anneal dates for the ACS/WFC detector. As part of the CCD Hot Pixel Annealing calibration program, the ACS detector is periodically annealed in an attempt to slow the growth of hot pixels that arise from radiation damage. For each anneal, the thermoelectric coolers are shutdown and the heaters are powered on to warm the detector up to about 19ºC over the of ~6 hours. Before and after each anneal, four 1040 second darks frames and 4 bias frames are taken for monitoring purposes to determine the efficiacy for the annealing process as the detector continues to degrade from radiation damage. 

timeline

Upcoming Anneal Windows for Cycle 27

Aug 17, 2020 - Aug 23, 2020
Sep 14, 2020 - Sep 20, 2020
Oct 12, 2020 - Oct 18, 2020

Completed Anneals

Completed Anneals 

Note, this list of completed anneals only contains anneals occuring after Servicing Mission 4 (SM4) which occurred in May of 2009.

LAST UPDATED: 08/13/2020

Please Contact the HST Help Desk with any Questions

https://hsthelp.stsci.edu