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. 

Anneal Windows for Cycle 27

Jun 17, 2019 - Jun 23, 2019 
Jul 15, 2019 - Jul 21, 2019 
Aug 12, 2019 - Aug 18, 2019 
Sep 9, 2019 - Sep 15, 2019 
Oct 7, 2019 - Oct 13, 2019 

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: 06/17/2019

Please Contact the HST Help Desk with any Questions

https://hsthelp.stsci.edu.