juliensimon/quasar-catalog

Quasar & AGN Catalog

Catalog of 50,000 quasars and active galactic nuclei from SIMBAD: 11,784 quasars, 19,665 Seyfert galaxies, 2,482 blazars/BL Lacs, 7,377 general AGN.

Schema

Column	Type	Description
name	string	Primary SIMBAD identifier
ra_deg	float	Right ascension (degrees)
dec_deg	float	Declination (degrees)
object_type	string	SIMBAD type code (QSO, AGN, Sy1, Sy2, BLL, Bla, LIN)
agn_category	string	Readable category (Quasar, Seyfert 1, Blazar, etc.)

Quick stats

• 50,000 objects
• 11,784 quasars, 19,665 Seyferts, 2,482 blazars

Usage

from datasets import load_dataset

ds = load_dataset("juliensimon/quasar-catalog", split="train")
df = ds.to_pandas()

# AGN type breakdown
df["agn_category"].value_counts()

Update frequency

Updated weekly on Monday at 19:00 UTC via GitHub Actions.

Data source

SIMBAD Astronomical Database (CDS, Strasbourg).

Related datasets

• black-hole-catalog — Known black hole systems and X-ray binaries
• messier-catalog — 110 iconic deep-sky objects
• ngc-ic-catalog — 14K deep-sky objects (NGC + IC)
• galaxy-clusters — 1,650+ Planck SZ-detected clusters

Pipeline

Source code: juliensimon/space-datasets

Citation

@dataset{quasar_catalog,
  author = {Simon, Julien},
  title = {Quasar & AGN Catalog},
  year = {2026},
  publisher = {Hugging Face},
  url = {https://huggingface.co/datasets/juliensimon/quasar-catalog},
  note = {Based on SIMBAD astronomical database (CDS Strasbourg)}
}