Tools and Status


Abell 370 is a massive galaxy cluster in the middle of a field of almost 8,000 galaxies

The Advanced Camera for Surveys (ACS) is a third-generation Hubble Space Telescope (HST) instrument installed in March 2002 during HST Servicing Mission 3B. The ACS CCD Electronics Box and Low Voltage Power Supply incrementally failed in June 2006 and January 2007, causing the loss of the ACS Wide Field Channel (WFC) and High Resolution Channel (HRC). 

The replacement components (CEB-R and LVPS-R) installed on 16 May 2009 during HST Servicing Mission 4 (SM4), successfully restored the function of the WFC but not that of the HRC. Consequently, only the WFC and the Solar Blind Channel (SBC) are available to observers. 

Current Status

HRC is not operational.

SBC is operating nominally.

WFC is operating nominally.

Improved Absolute Astrometry for WFC3 and ACS

Web Tools and Helpful Links

HST Exposure Time Calculator

ACS Photometric CTE Calculator

ACS Space Telescope Analysis Newsletters (STANs)


ACS Zeropoint Calculator

Program Information

ACS Instrument Resources

Recent News

Recently Published ISRs

View all ISRs


Most Recent ISRs

Listing Results

Results: 5

(ACS ISR 2020-03) Irregularity in Ceiling of Analog-to-Digital Conversion for Post-SM4 ACS/WFC Images

March 06, 2020Y. Cohen et al.

(ACS ISR 2020-02) New and Improved Saturated Pixel Flagging for the ACS/WFC

January 06, 2020Y. Cohen et al.

(ACS ISR 2020-01) Post-SM4 ACS/WFC L-Flats and Photometric Errors from Observations of Stellar Fields

January 06, 2020Y. Cohen et al.

(ACS ISR 2019-10) Bright Object Magnitude Limits for ACS/SBC and Color Corrections for All Three Channels

December 06, 2019J. E. Ryon et al

(ACS ISR 2019-08) Temporal Stability of the ACS/WFC OD-800W LED

September 16, 2019N.D. Miles and N. A. Grogin

Recently Published STANs

View all STANs


Filter ACS STANs

Listing Results

Results: 1

ACS STAN October 2019

October 25, 2019

ACS Software Updates


  • Released on Feb 28th, 2019
  • NEW acszpt module to query ACS Zeropoints Calculator
  • Removed Python 2 support
  • Documentation updates

HSTCAL v2.2.0

  • Released on Nov. 6th, 2018
  • Updated DARKCORR step of ACS2D.
  • Updated BLEVCORR step of ACSCCD
  • Implemented CTE forward modeling functionality 

LAST UPDATED: 03/24/2020

Please Contact the HST Help Desk with any Questions