msiudek/astroPT_euclid_Q1_desi_dr1_metadata

DESI DR1 × Euclid Q1 — Catalog Metadata (FITS)

This repository hosts the catalog metadata (FITS table) for the main dataset: https://huggingface.co/datasets/msiudek/astroPT_euclid_Q1_desi_dr1_dataset

Files

• DESI_DR1_Euclid_Q1_dataset_catalog_EM.fits (36.0 MB) — FITS table with 39,850 rows and 165 columns
• metadata_schema.json — lightweight column schema summary (name, dtype, unit, missing counts)

Column preview

name	dtype	unit	missing
object_id	>i8	NA	0
name		S100
right_ascension	>f8	deg	0
declination	>f8	deg	0
segmentation_area	>i4	pix	0
segmentation_map_id	>i8	NA	0
flux_detection_total	>f8	uJy	0
flux_vis_psf	>f8	uJy	0
kron_radius	>f8	pix	0
spurious_prob	>f8	NA	0
det_quality_flag	>i2	NA	0
spurious_flag	>i2	NA	0
release		S3
Separation	>f8	arcsec	0
TARGETID	>i8		0
TARGET_RA	>f8	deg	0
TARGET_DEC	>f8	deg	0
Z	>f8		0
HEALPIX	>i4		0
PROGRAM		S7
SURVEY		S7
SPECTYPE		S7
RA	>f8	deg	1
DEC	>f8	deg	1
RELEASE	>i2		1
CHI2	>f8		1
LOGM	>f8	log(solMass)	1
LOGM_ERR	>f8	log(solMass)	1
LOGSFR	>f8	log(solMass/yr)	1
LOGSFR_ERR	>f8	log(solMass/yr)	1
…	…	…	…

Full schema available in metadata_schema.json.

How to use

Below are two ways to access the catalog directly from this dataset.

Option A: Download with huggingface_hub and read via Astropy (suppress non-critical unit warnings)

from huggingface_hub import hf_hub_download
from astropy.table import Table
import warnings
from astropy.units.core import UnitsWarning

# Optional: silence unit parsing warnings from non-standard FITS TUNIT strings
warnings.filterwarnings("ignore", category=UnitsWarning)

fits_path = hf_hub_download(repo_id="msiudek/astroPT_euclid_Q1_desi_dr1_metadata", repo_type="dataset", filename="DESI_DR1_Euclid_Q1_dataset_catalog_EM.fits")
tab = Table.read(fits_path, format="fits")
print(tab)

Option B: Stream to memory with astropy.io.fits

from huggingface_hub import hf_hub_download
from astropy.io import fits
import warnings
from astropy.units.core import UnitsWarning

warnings.filterwarnings("ignore", category=UnitsWarning)

fits_path = hf_hub_download(repo_id="msiudek/astroPT_euclid_Q1_desi_dr1_metadata", repo_type="dataset", filename="DESI_DR1_Euclid_Q1_dataset_catalog_EM.fits")
with fits.open(fits_path, memmap=False) as hdul:
    data = hdul[1].data  # first table HDU
    print(data.names[:10])

Notes on FITS units

Some columns carry non-standard TUNIT strings (e.g., NA, nanomaggy, nanomaggy^-2, log(solMass), log(solMass/yr)). Astropy may emit UnitsWarning while reading them. These warnings do not affect data values; units simply default to None when unparsable. If desired, you can silence them via:

import warnings
from astropy.units.core import UnitsWarning
warnings.filterwarnings("ignore", category=UnitsWarning)

If you need strict units, consider mapping them manually to your preferred system (e.g., define a custom nanomaggy unit and treat nanomaggy^-2 as an inverse-variance in that unit).

License and citation

If you use this catalog, please also cite the main dataset:

@dataset{euclid_desi_dr1_q1,
  author = {Siudek, M. and collaborators},
  title = {DESI DR1 × Euclid Q1 Cross-matched Dataset},
  year = {2025},
  url = {https://huggingface.co/datasets/msiudek/astroPT_euclid_Q1_desi_dr1_dataset}
}

Additionally, please cite the source surveys and the value-added catalog used to build the metadata:

@article{desi_dr1_2024,
  title = {The Dark Energy Spectroscopic Instrument (DESI) Data Release 1},
  author = {DESI Collaboration},
  year = {2024},
  journal = {ApJ},
  note = {DESI DR1 overview paper}
}

@article{euclid_q1_2024,
  title = {Euclid Quick Data Release (Q1): MER catalog and data products},
  author = {Euclid Consortium},
  year = {2024},
  journal = {A"+"A},
  note = {Euclid Q1 data release documentation}
}

@dataset{siudek_2024_value_added,
  author = {Siudek, M. and collaborators},
  title = {Value-added catalog for DESI × Euclid cross-match},
  year = {2024},
  note = {Catalog of derived physical properties used in this metadata}
}