hla.stsci.eduWelcome to the Hubble Legacy Archive

Close × 2019 September 24: Hubble Catalog of Variables released. Find out what's new in the Hubble Source Catalog . The Hubble Legacy Archive (HLA) is designed to optimize science from the Hubble Space Telescope by providing online, enhanced Hubble products and advanced browsing capabilities. 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). Enter Site here. Hubble Catalog of Variables (2019 September 24) The Hubble Catalog of Variables (HCV) , a major new High-Level Science Product derived from the Hubble Source Catalog , was released. The HCV is the first homogeneous catalog of variable sources found in the HSC. It includes variable stars in our Galaxy and nearby galaxies, as well as transients and variable active galactic nuclei. The HCV is fully integrated with the MAST user interfaces for the HSC, including the HSC CasJobs and VO TAP database query interfaces and the MAST catalogs simple form interface and query API. There are Python Jupyter notebooks available that show how to access the data in scripts. The ESAC Science Data Centre has created the HCV Explorer , a new online web tool to access, visualize, and interactively explore the HCV. Hubble Source Catalog Version 3.1 (2019 June 27) HSC version 3.1 was released on 2019 June 26. It adds proper motions of over 400,000 objects in the SWEEPS field. The proper motion information is available in database tables within the HSCv3 context of the STScI CasJobs interface. We also provide a Python Jupyter notebook that queries the HSCv3 database through a Python interface to CasJobs. More details about HSC v3.1 are found here . HLA DR10.1 and Hubble Source Catalog Version 3 (2018 July 5) NEW DATA PRODUCTS Source lists from HLA DR10 have been combined to create version 3 of the Hubble Source Catalog. See the HSC Home Page for details and data access links. There are approximately 25% more ACS source lists and almost twice as many WFC3 source lists compared with HSC v2. The source list photometric quality is significantly improved. Improved astrometric calibration is based on the Gaia DR1 catalog. Shifts up to 100 arcsec have been correctly identified. 94% of the fields have matches to an external astrometric reference catalog. The scatter in magnitudes is measured using the median absolute deviation (MAD) of the differences from the median magnitude for more robust estimates. USER INTERFACE ENHANCEMENTS HSCv3 astrometric corrections are used for image cutouts and in the interactive display. The HSCv3 catalog is available for overlay in the interactive display. The older HSCv2 and HSCv1 catalogs are also accessible using the HSC Controls in the interactive display. HLA DR10 Release (2018 January 8) NEW DATA PRODUCTS All ACS and WFC3 data that were public as of 2017 October 1 have been processed. The new image processing pipeline fixes numerous data problems, including corrections for alignment shifts between exposures and a better algorithm for combining short and long exposures. The new source lists have more reliable photometry due both to the image improvements and to better tuning of parameters for the catalog software. All old ACS and WFC3 images have been replaced in this release. These new source lists were used for version 3 of the Hubble Source Catalog , which was released in July 2018. New deep, wide-field ACS and WFC3 multi-visit mosaic data products have been generated for 1348 fields. The new mosaic pipeline is based on the processing used for the Hubble Frontier Fields images. These images are astrometrically corrected and aligned using HSC version 2 . ACS and WFC3 products are drizzled onto a common pixel grid, which makes them easy to use. USER INTERFACE ENHANCEMENTS Previews and the interactive display handle photon-counting detectors such as the ACS/SBC better. Color images for mosaic data products can combine ACS/WFC, WFC3/UVIS and WFC3/IR images. The PanSTARRS DR1 catalog is included for overlay in the interactive display. See the release notes for more details on these and past releases. HLA ESSENTIALS The HLA interface runs in Firefox , Safari , Chrome , Internet Explorer (versions 8* and 9), and similar compatible browsers. *IE8 limitations - the scatterplot and plotting tools do not work on IE8 as it does not support HTML5. To fully realize all of the HLA's functionality, one must have cookies and popups enabled. The HLA includes enhanced data products (ACS, WFC3, WFPC2 & NICMOS images; ACS, WFC3 & WFPC2 source lists; ACS & NICMOS extracted grism spectra; ACS & WFC3 deep/wide mosaic images) and also provides access to the standard HST data products when HLA enhanced products have not yet been created. Footprints , which graphically display the sky coverage on a background image from the Digitized Sky Survey, are available for both standard and enhanced HST data products, including extracted grism spectra and community-contributed high-level science products. Here is a matrix describing what is and is not in the HLA: Instrument/Product Source HLA Enhanced Products 1 Download Format Interactive Display? Notes: Fraction of all HST data for which the HLA currently includes enhanced products. Note that the HLA searches and footprints also include standard products. Proprietary data and other data not yet processed by the HLA project are available through DADS requests (which may also be submitted using the HLA cart). Observations with guide star acquisition failures, zero exposure times, and similar problems are excluded. Some observing modes (moving targets, spatial scans, grisms, ramp filters, etc.) are processed only as single exposures rather than being combined. Contains essentially all ACS data publicly available through 2017 October 1. Also includes almost all data from the HRC , which ceased operation in January 2007. This is the fraction of HLA-processed ACS/WFC and ACS/HRC visits that have at least one SExtractor or DAOphot catalog. The fraction for ACS/WFC alone is higher (98%). These fractions exclude visits that are too heavily contaminated by cosmic rays to be usable for catalogs due to poor observing strategies. There are 47,919 extracted ACS grism from 153 archival fields. The most recent data included in the ACS grism were taken in February 2006. This is the fraction of HLA-processed WFPC2 visits that have at least one SExtractor or DAOphot catalog. Contains almost all WFC3 data publicly available through 2017 October 1. This is the fraction of HLA-processed WFC3 visits that have at least one SExtractor or DAOphot catalog. These fractions exclude visits that are too heavily contaminated by cosmic rays to be usable for catalogs due to poor observing strategies. Reprocessed NICMOS data through the latest STScI calibration pipeline. Data requiring SAAClean have undergone additional processing and have now been released. See the NICMOS Data Handbook for details. Enhanced data products have been produced for some of the Early Release Observation COS data and have been included in the HLA, together with similar WFC3 data. As for other HST instruments, standard raw and calibrated products for non-proprietary COS data are available through both the MAST and the HLA interfaces. ACS/combined images STScI 99% 2 FITS ✔ ACS/source lists STScI 95% 3 Ascii ✔ ACS/grism extractions ST-ECF 70% 4 FITS ACS/mosaic images STScI 2562 images for 1077 pointings FITS ✔ WFPC2/combined images CADC 99% FITS ✔ WFPC2/source lists STScI 97% 5 Ascii ✔ WFC3/combined images STScI 99% 6 FITS ✔ WFC3/source lists STScI 99% 7 Ascii ✔ WFC3/mosaic images STScI 1744 images for 610 pointings FITS ✔ NICMOS/grism extractions ST-ECF 80%, 1-D & 2-D spectra FITS NICMOS/images STScI 100% 8 FITS ✔ STIS/images and spectra STScI FITS ✔ FOS/spectra STScI Tar GHRS/spectra STScI Tar Contributed Products Community 9 FITS ✔ COS MAST FITS Enter Site here. --- The HLA Te...