Archive contents

All the HST observations currently available in the EHST are being synchronised with the MAST services for HST reprocessed public data and corresponding metadata, as a result of the collaboration between the partners STScI, CADC and ESAC, within the common HST Consolidation of Pipelines project. The HST archive at ESAC/ESA contains data from the following Hubble collections and catalogues:

Details on the collections and catalogues are given below. Please note that the Hubble Legacy Archive (HLA) collection will be added again very soon, we apologise for any inconvenience.

The HST Collection

The HST collection in the eHST is the standard HST archive content and contains the following:

  • All public (non-proprietary) HST data.
  • The standard HST archive products from the active instruments (ACS, COS, STIS, WFC3).
  • Data from legacy instruments (FOC, FOS, HRS, NICMOS, WFPC, WFPC2). These data have gone through a final calibration run and are not foreseen to change anymore.

Detailed information on the data produced by each instrument aboard the Hubble Space Telescope can be found in the official HST Data Handbooks.

The HLA Collection

  • Release: Data Release 10.0 (8th January 2018)

The HLA is a joint project of the Space Telescope Science Institute (STScI), the Space Telescope European Coordinating Facility (ST-ECF), and the Canadian Astronomy Data Centre (CADC). The HLA collection in the eHST contains enhanced image products for WFPC2 (produced by the CADC), ACS, NICMOS and WFC3 (produced by the STScI). Spectroscopy will be added very soon.

Hubble Source Catalog (HSC)

The Hubble Source Catalog is a combination of all the visit-based source lists in the Hubble Legacy Archive (HLA) into a single catalogue. It contains about 80 million detections of 30 million objects, involving 112 different detector/filter combinations, and about 160,000 HST exposures. Source lists from the Data Release 8 of the Hubble Legacy Archive (HLA) are matched using an algorithm developed by Budávari & Ludow (2012). The mean photometric accuracy is better than 0.10 mag, with relative accuracies as good as 0.02 in certain cases. The relative astrometric residuals are typically within 10 mas, and the absolute astrometric accuracy is better than about 0.1 arcsec for most sources.

HSC data provenance
Instrument Number of filters Number of sources Number of detections Retrieval date
WFPC2 38 29,146 13 × 106 2009/05/11
ACS/WFC 12 9,021 21 × 106 2011/02/16
WFC3/UVIS 47 4,772 31 × 106 2014/06/01
WFC3/IR 15 6,763 14 × 106 2014/06/01
All 112 49,702 79 × 106 -


Version 2 includes (see here for more details):

  • Four additional years of ACS source lists (i.e., through June 9, 2015). All ACS source lists go deeper than in version 1. See current HLA holdings for details.
  • One additional year of WFC3 source lists (i.e., through June 9, 2015).
  • Cross-matching between HSC sources and spectroscopic COS, FOS, and GHRS observations.

Hubble Catalog of Variables (HCV)

The Hubble Catalog of Variables (HCV) is the first full, homogeneous, catalog of variable sources found in the Hubble Source Catalog (HSC), which is built out of publicly available images obtained with the WFPC2, ACS and WFC3 instruments onboard the Hubble Space Telescope. The HCV is the deepest catalog of variables available. It includes variable stars in our Galaxy and nearby galaxies, as well as transients and variable active galactic nuclei. In total, the HCV includes 84,428 candidate variable sources (out of 3.7 million HSC sources that were searched for variability) with V ≤ 27 mag; for 11,115 of them the variability is detected in more than one filter. The data points in a light curve range from 5 to 120, the time baseline ranges from under a day to over 15 years, while ∼8% of variables have amplitudes in excess of 1 mag.

For more details, see About the Hubble Catalog of Variables.