Updated HLSPs for March
Good news for TESS fans: there are three new TESS-based HLSPs in MAST this month! We also have updates to the JWST-based SMILES dataset and two other TESS-based HLSPs.
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MUG Report Now Available
The MAST Users Group meets annually with MAST Staff to discuss our priorities and ensure they are aligned with user needs. Their 2025 report is now available for review.
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Updated HLSPs for February
A quiet month at MAST! There were updates to two of our TESS-based HLSPs.
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Now Live: HST Image Previews
No downloads required! Learn about how to see HST image previews without saving anything to your computer.
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The Impact of MAST
2026JANUARYWe're proud to share that our paper on MAST's impact has been accepted by PASP! Our conclusion? It only takes a few years for the publishing rate of archival papers to exceed the output of the original observing teams. By storing data for the long-haul, we enable archival science that far exceeds the scope of initial proposals; we believe this is true for any archive, not just MAST or other astronomy archives. Keep reading to see a subset of our figures and get a link to the paper!
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MAST Seeks Community Suggestions for Hosting Roman-Synergistic Datasets
2026JANUARY28MAST is looking for community suggestions for datasets to host that will enhance the scientific value of Roman data hosted on our archives. Let us hear your ideas!
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TESS Special Observation of Interstellar Comet 3I/ATLAS
2026JANUARY29TESS has observed the interstellar comet 3I/ATLAS in a series of special observations named "Sector 1751". These new data products include full frame images, TESSCut data cubes, and more now available at MAST.
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Introducing a New IUE Search Form
A new search form for the International Ultraviolet Explorer is now available! Explore data dating back to the 70s in our aesthetically pleasing and fast search tool.
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Updated HLSPs for December
New in December: images and maps of Uranus from the Outer Planets Legacy Survey, along with updates to the TESS-based TICA, TESS-SPOC, and QLP HLSPs.
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New and Updated HLSPs for November
Two new HLSPs were released; M87-HST-UV is the deepest ultraviolet image of M87 while TESS-YSO offers TESS light curves for young stellar objects. We also had an update to an outer planet imaging program and updates to our TESS-based HLSPs.
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New Version of the Hubble Spectroscopic Legacy Archive (HSLA)
Announcing the (re-)release of the Hubble Spectroscopic Legacy Archive! This latest version provides coadded COS and STIS spectra, includes classifications for each target, and supercedes the previous version of HSLA.
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Updated HLSPs for October
BOSZ 2024 stellar models updated to fix two issues; users are encouraged to re-download models to get these fixes. Updates were also made to the TESS-based TICA and QLP products.
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SDSS Legacy Spectra Data Now Available at MAST
The SDSS Legacy Archive at MAST (SLAM) now includes the SDSS Legacy Spectra Survey, the SDSS Supernova Survey, and the SDSS Extension for Galactic Understanding and Evolution (SEGUE). This dataset provides optical-wavelength 1-D spectra for over 1.8 million stars, galaxies, and quasars.
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New Feature: JWST Image Previews
2025SEPTEMBERWe recently added the ability to see JWST image previews in our modernized search form. Coming soon to other MAST missions! Plus, a bonus: a dark/light mode toggle 🌙 ☀️
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