Multimission Archive at STScI (MAST)

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About MAST


The Multimission Archive at STScI (MAST) supports a variety of astronomical data archives, with a primary focus on scientifically related data sets in the optical, ultraviolet, and near-infrared parts of the spectrum. See for a full list of the mission, survey, and catalog data distributed by MAST. MAST is a component of NASA's distributed Space Science Data Services (SSDS).

Access the Data

This is the main MAST website:

Dataset Locations

These are the actual dataset locations:

Contents of the Data

Mission and Target Name Search Window

The website form allows one to

  • perform a quick search by target name or coordinates for a specified set of data types (default is all). (Note: this mode currently excludes x-ray and radio missions) , or
  • list and briefly describe the available MAST missions for a specified set of data types (default is all).

Clicking the "search" button without any selection criteria will return a list of all the existing MAST data sets. The information below describes the various search options.

Note: if you already know which data set(s) you are interested in, (i.e., which mission or survey), you may instead

  • click the "Data Search" link to display a list of links to mission-specific search scripts, or
  • click on the mission names shown on the top MAST page to go to the mission home pages (a similiar list is displayed by clicking the "Missions" link at the top of the page).

The interface is a simple form with the following fields:

  • Enter Target name (or Coordinates):
  • Resolver: *SIMBAD *NED *Don't Resolve
  • and/or Band/Data Type(s):
  • Image (from Extreme UV to Radio)
  • Spectra (from Extreme UV to near IR)
  • Other (from Far UV to near IR)

High Level Science Products

High-Level Science Products (HLSP) are community contributed, fully processed (reduced, co-added, cosmic-ray cleaned etc.) images and spectra that are ready for scientific analysis. HLSP also include files such as object catalogs, spectral atlases, and README files describing a given set of data.

Search the HLSP to find objects of interest by product, object type, and/or wavelength. Select more than one item in each list by using the shift and the control keys. Click on the "search" button for a list of the products for that project. The title of the project is a link to more information about the project. You may search for specific targets by using the HLSP search page. You may also be interested in more information about download options. MAST encourages the submission of HLSP based on data from its missions. Please consult the Guidelines for Contributing HLSP for more information.

Spectral Data Coplot Utility

User can enter up to 15 data set names (e.g., SWP16877,O45P021B0,...) to coplot spectra from STIS, IUE, EUVE, HUT, BEFS, TUES, FOS, GHRS, or WUPPE. Scale factors and wavelength range can be specified either here or on the displayed plot page. (Caution: the averaging feature checks that the input spectra have the same total number of points and averages them bin by bin. It will cheerfully 'average' spectra with different wavelength ranges or resolution, producing meaningless output.)

NED Search Form

Use the NED Search form to search the NED Catalog by object name, position, object category, etc. and optionally, cross correlate results with MAST missions.

Scrapbook Search Form

Search the MAST catalog of representative spectra or images for an astronomical object. User can enter a target name or coordinates. Only fixed targets (i.e., no solar system objects) are available. A table of results will be displayed along with thumbnails of images or spectra.

Associated Data Analysis Software

Some of the data analysis software packages used for the MAST archived data are:

Useful data visualization software includes:

  • Aladin Sky Atlas to search, retrieve and visualize digitized astronomical images and catalog entries
  • Specview for 1-d spectral visualization and analysis
  • Starview, an astronomical database browser and research analysis tool

Information on these and other available astronomical data reduction and analysis software packages may be found at the Astronomical Software and Documentation Service.