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

Advice for Planning ACS Observations

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 2020-09) Validation of New ACS/WFC Geometric Distortion Reference Files Derived Using Gaia Data Release 2

December 03, 2020S. L. Hoffmann & V. Kozhurina-Platais

(ACS ISR 2020-08) Update of the Photometric Calibration of the ACS CCD Cameras

November 20, 2020R. C. Bohlin, J. E. Ryon, and J. Anderson

(ACS ISR 2020-07) Unusual Horizontal Charge Overflow from Saturated CCD Pixels in the ACS WFC: Discovery and Remediation

October 15, 2020Y. Cohen and N. A. Grogin

(ACS ISR 2020-06) Validation of Reduced Operate Anneal Mode in the Advanced Camera for Surveys Wide Field Channel

August 05, 2020M. C. McDonald, N. A. Grogin

(ACS ISR 2019-07) Advice for Planning ACS Observations

June 26, 2020R. A. Lucas et al.

Recently Published STANs

View all STANs


Filter ACS STANs

Listing Results

Results: 1

ACS STAN December 2020

December 17, 2020

ACS Software Updates


HSTCAL v2.3.0

  • Released on September 30, 2019
  • CALACS updated to Version 10.2.1

LAST UPDATED: 06/26/2020

Please Contact the HST Help Desk with any Questions