Stay Cool with MAST this Summer
Your favorite archivists will be at AAS 248 in Pasadena. We'll also be hosting a series of summer webinars on querying for MAST data. Read on for more details!
MAST NEWS
MAST sends out newsletters monthly. To recieve newsletters by email, sign up for a MyST account and you will automatically be subscribed. To manage your subscription, check in the message subscription settings by clicking "Registered User" and then "Manage My Account."
See newsletters from before April 2019
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New and Improved: MAST Subscriptions
MAST has transitioned to a new subscriptions service. If you have existing subscriptions, these will be migrated seamlessly to the new system.
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May HLSP Update
MAST has two new HST-based HLSPs this month. HST-Hyperion is a collection of redshift/emission-line catalogs, images, and spectra of over 12,000 galaxies within the proto-supercluster Hyperion. Also new this month is SKYSURF, the largest ever archival HST project that probes extragalactic background light at an unprecendented scale. We also have two regularly scheduled updates to our TESS HLSPs.
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Fornax Beta Release
NASA's Fornax initiative is now in an open beta phase. Analyze HEASARC, IRSA, and MAST data in the cloud.
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Updated HLSPs for April
MAST has two new HLSPs this month: a set of HST observations that examine the structure of gas and dust in NGC 5044, and a combined GALEX/SDSS catalog of hot white-dwarfs and sub-dwarfs. We also had updates from OPAL, QLP, and REFERENCE-ATLASES.
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Announcing the 2026 MAST Summer Webinar
We're pleased to present the agenda for the 2026 MAST Summer Webinar. We have three great sessions planned, read on to learn more and register!
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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.