datasets
Training and evaluation data, with the modality, task and licence stated up front. Listed live from the Hugging Face Hub.
planck-2018-chains
Planck 2018 Cosmological-Parameter Chains
This dataset contains the Planck Public Release 3 cosmological-parameter
full grid, COM_CosmoParams_fullGrid_R3.01.zip. It contains the Markov
chains and their GetDist and CosmoMC companions for 336 combinations of
cosmological model and likelihood or external-data selection. The 1,296
chain roots become 5,184 Parquet tables containing 27,699,519 rows.
The tables retain the source's headerless, positional structure. Arrow
fields are… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/planck-2018-chains.wmap-single-year-maps
WMAP DR5 Single-Year I/Q/U Maps
The preview renders the canonical year-1 K1 TEMPERATURE field in its source
NESTED order, using a Galactic Mollweide projection and a symmetric 99.5th
percentile colour range.
This dataset contains the complete full-resolution single-year I/Q/U release
served by LAMBDA: ten WMAP differencing assemblies for each of nine observing
years. These are year-specific, per-assembly measurements. They are distinct
from wmap-band-maps-9yr, whose five maps… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/wmap-single-year-maps.gwosc-o2-strain
GWOSC O2 16 kHz gravitational-wave strain
This dataset contains the 16,384 Hz H1, L1, and V1 strain records released by
the Gravitational Wave Open Science Center for the
second observing run (O2). Each detector's 1 Hz data-quality and
hardware-injection masks are separate configurations, preserving the source
cadences.
Observing run
O2
GPS extent
1164558336–1187737600
Detectors
H1 (Hanford), L1 (Livingston), and V1 (Virgo)
Strain
16,384 Hz, float64
Masks… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/gwosc-o2-strain.gaia-dr3-source
Gaia DR3 Source
This dataset mirrors the complete ESA Gaia Data Release 3 gaia_source
bulk-download table. It contains one record for every published Gaia source and
all 152 columns served by ESA, including source identifiers, astrometry,
photometry, observing statistics, quality fields, classifications, and
astrophysical parameters.
Each of ESA's 3,386 compressed ECSV shards is retained as one dataset
configuration. The configuration name is the source filename stem verbatim.… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/gaia-dr3-source.gwosc-o1-strain
GWOSC O1 16 kHz gravitational-wave strain
This dataset contains the 16,384 Hz H1 and L1 strain records released by the
Gravitational Wave Open Science Center for Advanced
LIGO's first observing run (O1). Each detector's 1 Hz data-quality and
hardware-injection masks are included as separate configurations so that
measurements with different cadences remain separate.
Observing run
O1, GPS 1126051217–1137254417
Detectors
H1 (Hanford) and L1 (Livingston)
Strain
16… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/gwosc-o1-strain.fermi-lat-weekly-photons
Fermi-LAT weekly photons
This dataset contains Fermi Large Area Telescope all-sky weekly photon files
from mission week w009 through w153, frozen on 2026-08-30. Its 145
configurations correspond one-to-one with the weekly p305_v001 FITS files.
Each Parquet row is an EVENTS row, with the 23 FITS-named columns in their
stored order and shape.
Mission weeks run Thursday through Wednesday in UTC. The first configuration
begins with the science-phase interval on 2008-08-04; w153… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/fermi-lat-weekly-photons.semantaai-fx-majors-legacy-20260403
semantaai-fx-majors
Semanta AI dataset with two layers: raw and gold.
raw rows: 32032242
gold rows: 46072167
from floor UTC: 2006-01-01T00:00:00+00:00
end UTC: 2026-04-03
swas-fits-spectra
SWAS FITS Spectra
The SWAS Tenth Public Release pointing-based IRAF-FITS Level 1.5 product serves 6,962 containers containing four or six named spectral image members.
Use
from datasets import load_dataset
ds = load_dataset("astro-legacy-archive/swas-fits-spectra", "14498-5856_0001__SWAS_IMEXT001_B1", split="train")
row = ds[0]
values = row[ds.column_names[0]]
print(len(values), values[:3])
725 [0.00926896184682846, 0.007523952983319759, 0.001602768199518323]… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/swas-fits-spectra.mmu_ssl_legacysurvey_north
mmu_ssl_legacysurvey_north HATS Catalog Collection
This is the collection of HATS catalogs representing mmu_ssl_legacysurvey_north.
This dataset is part of the Multimodal Universe,
a large-scale collection of multimodal astronomical data. For full details, see the paper:
The Multimodal Universe: Enabling Large-Scale Machine Learning with 100TBs of Astronomical Scientific Data.
Access the catalog
We recommend the use of the LSDB Python framework to access HATS… See the full description on the dataset page: https://huggingface.co/datasets/UniverseTBD/mmu_ssl_legacysurvey_north.cbi-released-products
Cosmic Background Imager released products
This repository contains the numerical products released for four generations of Cosmic Background Imager (CBI) analysis: the 2000 deep fields, the 2000 mosaic fields, the final 2002–2005 temperature and polarization analysis, and the final 2000–2005 total-intensity analysis. It contains the published band powers, their window functions, the same-band correlation blocks and full Fisher matrices distributed in CosmoMC .newdat files, and… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/cbi-released-products.juno-microwave-maps
Juno microwave sky maps and map-space companions
This dataset contains the 2025 LAMBDA release of Juno Microwave Radiometer sky
maps and correlated-noise companions. Each of the 48 FITS bintables is one
Parquet configuration named by its source filename stem. Its column is T,
with the source table shape, float64 or int64 dtype, and row order. The six HDF5 companions add 20 dense-matrix
configurations named by the source filename stem, __, and the HDF5 leaf name.
Each leaf name… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/juno-microwave-maps.planck-frequency-maps-pr4
Planck PR4 NPIPE Frequency Maps
This dataset contains the nine Planck Public Release 4 frequency maps
produced by the NPIPE joint LFI/HFI processing pipeline. It serves the
full-mission, full-channel source tables exactly as released: source
column names, units, fixed-vector shapes, row order, dtypes, and value
bits are preserved. Metadata makes the source representation
self-describing without flattening, renaming, or normalising it.
The included maps are the R4.00 products at… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/planck-frequency-maps-pr4.mmu-norm-legacy-north
Legacy Survey DR9 North image cutouts — L1 (release v1)
This L1 repository contains 2,191,927 objects matched across the release, in 726 shards (about 700 GB). Each object has 152×152-pixel cutouts at 0.262″ per pixel in three bands.
Band names: DR9 North imaging uses BASS g/r and MzLS z. This repository uses bass-g, bass-r, and mzls-z; the original des-g/des-r/des-z tokens are kept in native_band_tokens.
Schema
image struct: band (3), flux (3×152×152… See the full description on the dataset page: https://huggingface.co/datasets/kshitijd/mmu-norm-legacy-north.msam-released-products
MSAM released flight products
This dataset contains the complete numeric contents of the three MSAM1 flight
archives served by LAMBDA: the June 1992, June 1994, and June 1995 observation
tables, sampled beam maps, and released 1994/1995 covariance matrices. The 38
configuration identifiers preserve the flight directory and source filename
stem.
How to use
python -m venv .venv && .venv/bin/pip install datasets huggingface_hub pyarrow
from datasets import… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/msam-released-products.cosb-photon-events
COS-B photon events
python -m venv .venv && .venv/bin/pip install datasets huggingface_hub pyarrow
This dataset contains the archive-natural event products for all 65 COS-B
pointings served by HEASARC. Each configuration is one source event file;
pointing 37, targeted on M31, is used in the examples below.
Cite H. A. Meyer-Hasselwander et al. (1986), Explanatory Supplement to the
COS-B Final Database, Proc. Cosmic Ray Conf., La Jolla, ESA Publication.
No explicit dataset… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/cosb-photon-events.vsa-released-products
VSA February 2004 released products
This dataset contains LAMBDA's February 2004 VSA spectrum, x factors,
16 window functions, and Hessian product. LAMBDA serves the Hessian as 256
lines with one numeric value per line; its documentation identifies those
values as the 16×16 M_ij, but does not state how flat positions map to
matrix indices. Unlabelled source columns remain Column 1, Column 2, and
so on.
Use
python -m venv .venv && .venv/bin/pip install datasets… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/vsa-released-products.planck-frequency-maps-pr3
Planck PR3 Legacy Frequency Maps
This dataset contains the nine Planck Public Release 3 (2018 Legacy)
full-mission, full-channel frequency maps. It serves the source binary
tables exactly as released: source column names, units, scalar shapes,
row order, dtypes, and value bits are preserved. Self-description in
the Parquet metadata resolves the otherwise opaque source identifiers;
it does not rename or normalise them.
The LFI products are the R3.00 maps at 30, 44, and 70 GHz.… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/planck-frequency-maps-pr3.wmap-band-maps-9yr
WMAP Nine-Year Frequency Band Maps
This dataset contains the five WMAP nine-year RAW, rather than
foreground-reduced, coadded frequency-band sky maps. Each source file
contributes a Stokes Maps config containing full-sky Stokes I, Q, and
U measurements and observation counts, and a separate Weight Arrays
config containing its polarisation weights. The nominal frequencies
are K = 23 GHz, Ka = 33 GHz, Q = 41 GHz, V = 61 GHz, and W = 94 GHz.
LAMBDA describes the coaddition: "The… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/wmap-band-maps-9yr.ovro-lwa-sky-maps
OVRO-LWA Sky Maps
These eight brightness-temperature maps were made by
Tikhonov-regularized m-mode analysis imaging with the Owens Valley Radio
Observatory Long Wavelength Array. Each has 50,331,648 NSIDE-2048
pixels, with coverage nominally north of declination -30 degrees. They
are harmonically filtered products: each map has a00 = 0, all m = 0
spherical-harmonic modes removed, and m = 1 modes with l > 100
filtered to suppress terrestrial interference. Large-scale structure… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/ovro-lwa-sky-maps.legacy_v2_datadesi_legacysurvey_xmatch
DESI × Legacy Survey cross-match
95,895 galaxies, each carrying three modalities of the same object:
DESI PROVABGS value-added properties (*_provabgs): redshift Z_HP_provabgs,
stellar mass LOG_MSTAR_provabgs, SFR, MCMC posteriors, magnitudes, ...
DESI spectrum (spectrum): flux / ivar / wavelength / mask / LSF, plus DESI
photometry (*_spec)
Legacy Survey DR10 (DECaLS south) imaging: image (160×160 cutouts in
g,r,i,z with ivar + mask planes), rgb / object_mask / blobmodel PNGs… See the full description on the dataset page: https://huggingface.co/datasets/EiffL/desi_legacysurvey_xmatch.semantaai-fx-majors-gold5m-legacy-gamma
semantaai-fx-majors-gold5m
Semanta AI majors gold 5m layer extracted from fx-majors.
truthfulness_legacyakari-fir-all-sky-maps
AKARI FIR All-Sky Maps
These four configurations contain the native-resolution AKARI
Far-Infrared Surveyor all-sky intensity maps at 65, 90, 140 and 160
microns. They preserve the NSIDE-4096 HEALPix renderings made by CADE
and frozen by NASA LAMBDA.
Instrument
AKARI Far-Infrared Surveyor
Bands
N60, WIDE-S, WIDE-L and N160
Wavelengths
65, 90, 140 and 160 microns
Pixelisation
HEALPix NSIDE 4096; 201,326,592 pixels
Ordering
NESTED
Coordinate frame
Galactic… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/akari-fir-all-sky-maps.wmap-masks-9yr
WMAP Nine-Year Analysis Masks
This dataset contains six analysis and point-source masks from the WMAP
DR5 nine-year release. Each config is a full-sky HEALPix mask whose value
is 0 for an excluded pixel and 1 for an admitted pixel. The temperature
and source masks support temperature analysis; the polarisation masks
are intended for Q/U analysis.
Intended uses
Apply the appropriate mask to the WMAP frequency-band maps before
computing any quantitative statistic.… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/wmap-masks-9yr.gw150914-strain
GW150914 gravitational-wave strain
This dataset contains the 32-second, 4,096 Hz H1 and L1 strain records
released by the Gravitational Wave Open Science Center
for GW150914, together with each detector's data-quality and
hardware-injection masks at their native 1 Hz cadence. The six configurations
preserve the source HDF5 dataset names and keep measurements with different
cadences separate.
Event
GW150914 (GW150914-v3), GPS 1126259462.4
Detectors
H1 (Hanford)… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/gw150914-strain.legacysurveys-dr10-20-embeddings-pca
Legacy DR10 r<20 Embeddings
AION-Search and AION embeddings for Legacy DR10 galaxies with r_mag < 20 mag.
This dataset stores AION-Search embeddings 96-dim PCA projections rather than the original 1024-dim. The PCA model files aion_search_pca96_model.npz is included in this repository and is needed after transforming a text query through AION-Search.
import numpy as np
pca = np.load("aion_search_pca96_model.npz")
x96 = (x1024 - pca["mean"]) @ pca["components"].T
x96 /=… See the full description on the dataset page: https://huggingface.co/datasets/astronolan/legacysurveys-dr10-20-embeddings-pca.iris-infrared-maps
IRIS Infrared Maps
The Improved Reprocessing of the IRAS Survey (IRIS) provides co-added
infrared sky-brightness maps at 12, 25, 60 and 100 microns. These four
configurations are the authors' native-resolution NSIDE-2048 nohole
HEALPix products, frozen by NASA LAMBDA. HCON1, HCON2 and HCON3 were
co-added, and DIRBE data fill the roughly two per cent of the sky not
observed by IRAS.
Bands
12, 25, 60 and 100 microns
Pixelisation
HEALPix NSIDE 2048; 50,331,648… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/iris-infrared-maps.eda2-159mhz
EDA2 159 MHz Southern-Sky Maps
This dataset contains four products from the EDA2 159 MHz southern-sky
survey: maps made with and without a large-scale sky prior, a noise map,
and a spectral-index map against the Haslam 408 MHz survey. The two
intensity maps and the noise map cover the complete HEALPix grid; the
spectral-index map has 279 pixels carrying the source HEALPix UNSEEN value.
Intended uses
The maps support low-frequency sky and foreground studies… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/eda2-159mhz.cobe-dmr-four-year-sky-maps
COBE DMR four-year sky maps
Regenerate the preview from the published Parquet data with
python tools/render_hub_preview.py cobe-dmr-four-year-sky-maps datasets/cobe-dmr-four-year-sky-maps/preview.png.
This dataset contains the twelve COBE Differential Microwave Radiometer
four-year Project Data Set sky maps served by LAMBDA. The independent A and B
radiometers at 31.5, 53, and 90 GHz are each provided in the source ecliptic
and Galactic quadrilateralized spherical-cube… See the full description on the dataset page: https://huggingface.co/datasets/astro-legacy-archive/cobe-dmr-four-year-sky-maps.