Tessera

MAST - Mikulski Archive for Space Telescopes

@mast-news.bsky.social

MAST archives UV/optical/IR data from NASA missions, contributed science products, and analysis tools. https://archive.stsci.edu This account is primarily to inform our users of updates. For the general public, follow https://bsky.app/profile/stsci.edu

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MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 3w ago

New HLSP: The Treasury of Extremely Metal-Poor O Stars (TEMPOS), a Cycle 31 HST Large Treasury program to build a far-ultraviolet spectral atlas of 29 hot, massive O-type stars in nearby metal-poor galaxies (<20% Solar) with compositions similar to early-Universe stars. archive.stsci.edu/hlsp/tempos

Overview of diagnostic features in the coadded HST/COS spectra from TEMPOS. An FUV spectrum is shown for the example star BUG A13 in the dwarf galaxy IC 1613 in nine different panels laid out in a three-by-three grid. Each panel shows important diagnostic features in the spectrum highlighted in orange or purple.

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · last mo.

"And that's where an archive like this becomes so important, because you can consolidate all of that information from all these different telescopes operating at all these different wavelengths and have a one-stop shop where you can go and find what you need." Couldn't have said it better ourselves!

Dr. Susan E. Mullally@mustaric.bsky.social · last mo.

Take a tour of the sky as stored by the MAST archive and presented by Dr. Meghan Gray. www.youtube.com/watch?v=2Zs6.... She does an excellent job of showing off an image created by Julie Imig, a scientist at MAST.

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · last mo.

New HLSP: Parallel Ionizing Emissivity (PIE) survey, a large Pure Parallel HST program (PID 17147, PI Scarlata) designed to constrain the emission of Lyman continuum (LyC) radiation in galaxies at 3.1 < z < 3.5. archive.stsci.edu/hlsp/pie

The figure shows throughput of the PIE filters (F336W, F475W, F625W, F814W) as a function of wavelength, overlaid on an example galaxy spectrum (z~3.1) to illustrate the Lyman break technique, which uses a jump in flux between 3000 and 4000 angstroms, for the selection of high-redshift galaxies. The F336W and F475W filters bracket the jump in flux, with F336W in the absorbed wavelength range and F475W in the brighter wavelength range.

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 2mo ago

HLSP Announcement: QLP Sectors 99-104 currently suffer from a barycentric timing correction error, which was identified starting in Orbit 210 through Orbit 220. For more details, please visit the QLP homepage, which will be updated as products are replaced. archive.stsci.edu/hlsp/qlp

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 2mo ago

HLSP Update: QLP calibrated light curves from TESS full frame images for Sector 104 are now available at MAST. This Sector adds 1,152,719 targets derived from 200 second cadence FFIs. archive.stsci.edu/hlsp/qlp

Sky projected plot of the Sectors 83-97 footprints on the sky. Each footprint is shaded a different color to stand out compared to others. Right ascension is along the x-axis and declination is along the y-axis. The biggest gaps in coverage occur approximately between 0 and +50 degrees declination, and along right ascension 23 to 5 hours. The x-axis spans from 24 hours to 0 hours (a reversed axis) and the y-axis spans from approximately -80 to + 80 degrees.

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 2mo ago

New HLSP: Terry Hubble Observations of Roman (THOR) early-release catalog of point sources in the Roman Galactic Bulge Time Domain Survey footprint. Multi-passband photometry and astrometry (ACS+WFC3, F606W+F814W) cross-matched to HST-WFC3IR and Gaia DR3 where available. archive.stsci.edu/hlsp/thor

This two-panel figure shows, on the left; the color-magnitude diagram (CMD) for four of the early-release fields (HD16, HD70, HD98, and HD138). The stars in each of these four CMDs are in different positions in color and magnitude-space, largely due to the differential reddening and extinction along these sight lines toward the galactic bulge. On the right; the CMD of stars in the HD138 field, along with cross-identified Gaia DR3 stars (colored by Gaia G mag). The right-panel demonstrates the vast difference in detection efficiency and limiting magnitudes between Gaia DR3 and HST, where Gaia extends down to F814W of ~19.5, the HST detections extend to F814W of ~24.

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 3mo ago

HLSP Update: JWSTSTARS adds epoch photometry for the RR Lyrae population in WLM, and pulsation parameters for sources cross-matched with HST data. These include pulsation type; HST-derived periods; filter-wise amplitudes and mean magnitudes in F090W and F150W. archive.stsci.edu/hlsp/jwststars

Period-Amplitude diagrams for the JWST-HST cross-matched RR Lyrae sources in the F090W (left) and F150W (right) filters. Fundamental mode type pulsators (RRab) are shown in blue, while first-overtone type pulsators (RRc) are shown in orange. The two populations split into distinct regions of the diagram, with RRab sources having larger periods and spanning a larger range of amplitudes, while RRc sources sit in a lower-period, lower-amplitude region of the parameter space. The periods are filter-independent, measured in days, and presented on a base-10 log scale. The period axis (horizontal) ranges from log(P)=-0.5 to -0.2 on both diagrams. The amplitudes in the F090W filter are larger than those of the F150W filter, and are presented in magnitudes. The amplitude axis (vertical) in the F090W filter ranges from approximately 0.1 to 0.7 mag, while the F150W ranges approximately from 0.05 to 0.4 mag.

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 3mo ago

HLSP Update: TESS-SPOC calibrated light curves and target pixel files from TESS full frame images for Sector 85 are now available at MAST. This Sector adds 159,996 targets derived from 200 second cadence FFIs. archive.stsci.edu/hlsp/tess-spoc

A histogram showing the number of targets per 0.25 magnitude bin from three different categories: two-minute targets (in dark blue), FFI-included targets (in light blue) and FFI field star targets (in red). The two-minute targets are primarily between TESS magnitude 8-12 and the maximum bin count is approximately 1000. The FFI-include targets have a more strongly peaked distribution centered on TESS magnitude 11 and at the maximum bin count is approximately 6500. The FFI field star targets also follow a strongly-peaked distribution centered at TESS magnitude 12.5 and have a maximum bin count size of almost 16000.

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 3mo ago

HLSP Update: QLP calibrated light curves from TESS full frame images for Sector 103 are now available at MAST. This Sector adds 1,722,931 targets derived from 200 second cadence FFIs. archive.stsci.edu/hlsp/qlp

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 3mo ago

HLSP Update: QLP calibrated light curves from TESS full frame images for Sector 102 are now available at MAST. This Sector adds 1,768,856 targets derived from 200 second cadence FFIs. archive.stsci.edu/hlsp/qlp

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 4mo ago

HLSP Update: TESS-SPOC calibrated light curves and target pixel files from TESS full frame images for the "Comet 3I" Sector 1751 are now available at MAST. This Sector adds 159,993 targets derived from 200 second cadence FFIs. archive.stsci.edu/hlsp/tess-spoc

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 4mo ago

HLSP Update: PHANGS-CAT has built an integrated dataset for multi-phase, multi-scale studies of star formation. Data Release 5 (DR5) provides HST photometry with improved estimates of age, mass, and reddening, across the full sample of 38 PHANGS-HST spiral galaxies. archive.stsci.edu/hlsp/phangs/...

Figure 26 from Thilker et al. 2025 - A plot of the log of the galaxy mass vs the log of the star formation rate (i.e., the Main Sequence of star forming galaxies) for the 38 galaxies in the sample. Small version of the cluster age-mass diagrams are shown as the data points.

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 4mo ago

New HLSP: TARS provides systematics-corrected light curves and Lomb-Scargle periodograms for 39 million star-sector combinations (7.5 million unique stars) observed by TESS between Sectors 1 and 96. This dataset was used to measure rotation periods from >1 million stars. archive.stsci.edu/hlsp/tars

This figure shows diagnostics per star. At the top are a set of statistics and metadata about the star. In the upper-right is a finding chart showing the target and nearby sky based on DSS color images. The bottom 2/3rds contains four graphs: an unfolded light curve, a periodogram, and phase-folded light curves at the estimated rotational period and twice that period.

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 5mo ago

HLSP Update: Scylla adds 1.5 million new stellar SED fits and dust maps for 60+ fields across the SMC and LMC. SED fits provide stellar mass, age, distance, metallicities, and dust properties. Parsec-scale dust maps provide 10x higher resolution than existing maps. archive.stsci.edu/hlsp/scylla

A Hubble image of a dust-rich region near the Tarantula Nebula in the LMC (LMC-22), one of the fields covered by the Scylla survey's new dust maps and SED fits. Dust clouds show compact structures and variable density across the field, illustrating the range of extinction environments that Scylla's parsec-scale Av maps characterize across more than 60 fields in the SMC and LMC. Image Credit: ESA/Hubble & NASA, C. Murray

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 5mo ago

New HLSP: SKYSURF combines 143,914 Hubble ACS/WFC, WFC3/UVIS, and WFC3/IR images from 2002-2020 to probe the extragalactic background light (EBL) at an unprecedented scale. archive.stsci.edu/hlsp/skysurf (1/2)

Sky coverage of SKYSURF's 38,027 single-visit mosaics. This is an Aitoﬀ Equatorial projection. Each black point, which are scattered throughout the diagram, represents the location of one single-visit mosaic. The regions shaded grey represent the areas filtered out of the multi-visit analysis: they form a "horseshoe" shape across a range of latitudes longitudes. Visits excluded from the multi-visit analysis are indicated by colored points: purple points indicate that a visit was filtered out due to being too close to a known bright source, blue points indicate that a visit was filtered out due to its location relative to the Milky Way's disk, and orange points indicate that a visit was filtered out due to its location relative to the Milky Way's bulge.

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 5mo ago

HLSP Update: QLP calibrated light curves from TESS full frame images for Sector 101 are now available at MAST. This Sector adds 1,801,255 targets derived from 200 second cadence FFIs. archive.stsci.edu/hlsp/qlp

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 5mo ago

HLSP Update: TESS-SPOC calibrated light curves and target pixel files from TESS full frame images for Sector 84 are now available at MAST. This Sector adds 159,999 targets derived from 200 second cadence FFIs. archive.stsci.edu/hlsp/tess-spoc

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 5mo ago

New HLSP: HST-Hyperion provides redshift and emission-line catalogs, images, and both 2D and 1D spectra of more than 12,000 galaxies in the COSMOS field within the region of the proto-supercluster Hyperion, including several hundred member galaxies. archive.stsci.edu/hlsp/hst-hyp...

The Hyperion proto-supercluster. Overdense regions based on previous work are shown as shaded contours in shades of gray. Various points are plotted over the contours showing the location of spectroscopic sources: blue circles for targets identified in HST-Hyperion, red stars for C3VO MOSFIRE, and yellow triangles or white circles for other literature.

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 6mo ago

HLSP Update: TESS-SPOC calibrated light curves and target pixel files from TESS full frame images for Sector 83 are now available at MAST. This Sector adds 159,997 targets derived from 200 second cadence FFIs. archive.stsci.edu/hlsp/tess-spoc

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 6mo ago

HLSP Update: QLP calibrated light curves from TESS full frame images for Sector 100 are now available at MAST. This Sector adds 2,049,834 targets derived from 200 second cadence FFIs. archive.stsci.edu/hlsp/qlp

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 6mo ago

HLSP Update: OPAL adds HST observations of Jupiter Cycle 32 from December 2025, now available at MAST. archive.stsci.edu/hlsp/opal

An image collage showing HST observations of, from left to right, Jupiter, Uranus, Saturn, Neptune. The images are in color: Jupiter and Saturn in hues of orange, yellow, and brown, while Neptune and Uranus are shades of blue. The images are highly detailed, such that structures in their atmospheres like cloud bands are clearly visible.

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 6mo ago

New HLSP: NGC5044-HST analyzes the morphology of ionized gas filaments and dust structures in the center of NGC 5044. This enables studies of the spatial relationship between warm ionized gas, dust, and sites of recent star formation in this nearby galaxy group. archive.stsci.edu/hlsp/ngc5044...

Two square images displayed side-by-side of galaxy NGC-5044. On the left, an RGB composite of combining HST F300X (blue), F665N (green), and F814W (red) images from HST show a bright elliptical galaxy near the center of the frame. The right image highlights the H-alpha filaments in NGC-5044, by subtracting the galactic continuum from each filter before combining. The filaments appear as green-colored clumpy clouds which stretch through the galaxy, mostly oriented vertically in the perspective of this image.

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 6mo ago

HLSP Update: REFERENCE-ATLASES, which includes changes from September 2025 (which were not announced previously) and April 2026. archive.stsci.edu/hlsp/referen.... Details in thread.

Ratio to the 9550 K model continuum level for the STIS measured fluxes (shown in black), the Kurucz 9550 K, log g=3.95 model (shown in green), and the Kurucz 9400 K model (shown in red). The red model has a ratio > 1 in the red/infrared part of the spectrum starting at roughly 6000 Angstroms. Top panel shows 1800-3200 Angstroms, where both green and red models ratios are below the STIS measured fluxes (shown in black).

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 6mo ago

New HLSP: GUVCAT-HOTSTARS, a set of catalogs derived from 71k GALEX UV sources with FUV - NUV colors <= 0.1 mag and have SDSS photometry, corresponding to stellar Teff>~20,000K. 51% of the binary- and 20% of the single-star candidates are previously unknown objects. archive.stsci.edu/hlsp/guvcat-...

Scatter plot showing GALEX NUV - SDSS g color on the y-axis versus SDSS g - SDSS i color on the x-axis. Dots in green (mostly in the upper left region of the plot) are candidate single while dots in orange (mostly to the right of the green dots and scattered throughout the rest of the plot) are candidate binary hot evolved stars. In cyan towards the center of the plot are sources with Simbad type = QSO or AGN or Seyfert. A number of synthetic models are plotted as angled lines over the dots, showing expected locations of white dwarf, main sequence, and supergiant stars, with solid and dashed lines showing up as metallicity = 0.02 and 0.006, respectively.

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 7mo ago

HLSP Update: TESS-SPOC calibrated light curves and target pixel files from TESS full frame images for Sector 82 are now available at MAST. This Sector adds 159,994 targets derived from 200 second cadence FFIs. archive.stsci.edu/hlsp/tess-spoc

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 7mo ago

HLSP Update: QLP calibrated light curves from TESS full frame images for Sector 99 are now available at MAST. This Sector adds 2,149,786 targets derived from 200 second cadence FFIs. archive.stsci.edu/hlsp/qlp

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 7mo ago

New HLSP: TEQUILA, a catalog of variable point sources from TESS FFIs in Sectors 1–26. Uses a Difference Image Analysis pipeline to create 6,000,000 lightcurves capturing a wide range of variability: stellar variables, transient events, and solar system objects. archive.stsci.edu/hlsp/tequila

This figure shows an example of a TEQUILA lightcurve (flux vs time) of the dwarf nova ASASSN-15nl (TIC 1000887074) extracted from TESS Sector 16. The transient’s superoutburst (jump in brightness a few days from the start of the lightcurve) brought the source into the detectable range, after which it dims gradually into a sinusoid pattern and drops off from there.

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 7mo ago

New HLSP: TESS-3I light curves of comet 3I/ATLAS in Jan 2026. Note: the animation is not astrometrically aligned across frames, so apparent "motion" side-to-side is not the absolute motion of the object. Residuals may be in some frames: these are not outburst events. archive.stsci.edu/hlsp/tess-3i

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 7mo ago

HLSP Update: SMILES Data Relase 2 public at MAST. JWST/NIRSpec medium-resolution spectra and catalogs for 166 galaxies at cosmic noon and beyond, with rich ancillary data enabling studies of obscured AGN, galaxy evolution, multiphase outflows, and environment trends. archive.stsci.edu/hlsp/smiles

$Plot on sky showing the SMILES Nirspec MSA Slitlets as black bars, aligned within an orange-shaded field-of-view spanning an RA of 3:32:12 to 3:33:00 in HMS format, and Declination -27:45:00 to -27:54:00 degrees, representing the SMILES MIRI imaging footprint. A large fraction of SMILES overlaps regions on the sky covered by the JADES and FRESCO surveys, which are denoted with green and blue bordered rectangles.$

MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 7mo ago

New HLSP: HALO-TESS provides custom light curves for 98 saturated stars in TESS Full Frame Images. The team presents 411 light curves from Sectors 1-93, of which 77 are identified as variables! archive.stsci.edu/hlsp/halo-tess

An HR diagram from the Hipparcos-Tycho catalog. The stars in the HALO-TESS sample are color-coded by the number of available TESS sectors, with their sizes indicating their apparent V-band magnitudes. The y-axis plots absolute V magnitude ranging from 6 to -9, the x-axis plots B-V color ranging from -0.5 to 2.0. A majority of the HALO-TESS targets land from absolute V magnitudes of 2.5 to -6 and B-V colors from -0.5 to 0.25, although a few targets populate unique areas of parameter space.