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 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.

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


Most Recent ISRs

Listing Results

Results: 5

Assessing the Accuracy of Relative Photometry on Saturated Sources with ACS/WFC (ACS ISR 2019-03)

July 30, 2019M. Olaes, S. Hoffman, and A. Bellini

Post-SM4 ACS/WFC Bias II: Temporal Structure in the Prescan Bias Level (ACS ISR 2019-06)

July 16, 2019T.D. Desjardins and H.G. Khandrika

Post-SM4 ACS/WFC Bias I: The Read Noise History (ACS ISR 2019-02)

March 28, 2019T. D. Desjardins

The ACS/WFC G800L Grism: I. Long-term Stability (ACS ISR 2019-01)

February 28, 2019N. Hathi et al.

ACS/WFC Parallel CTE from EPER Tests (ACS ISR 2018-09)

December 20, 2018J. Ryon et al.

View all ISRs

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: 07/01/2019

Please Contact the HST Help Desk with any Questions