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

View all ISRs


Most Recent ISRs

Listing Results

Results: 5

SBC Absolute Flux Calibration (ACS ISR 2019-05)

October 17, 2019R. J. Avila et al.

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

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

SBC Time-Dependent Sensitivity and L-flats (ACS ISR 2019-04)

September 16, 2019R. J. Avila et al.

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

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: 10/25/2019

Please Contact the HST Help Desk with any Questions