Principal Galaxy Catalog 2003: One Million Galaxies with Homogenized Properties

The Principal Galaxy Catalog 2003 (PGC2003) contains approximately one million confirmed galaxies brighter than a B-magnitude of ~18. It was created to form the framework of the HYPERLEDA database, superseding the older LEDA catalog, and was made available by NASA HEASARC in July 2004. The catalog provides homogenized galaxy properties and cross-referenced names from 50 sources.

Use Cases

• Identify and cross-match galaxies across different astronomical databases based on the collection of names from 50 catalogs.
• Study galaxy morphology and structure based on homogenized diameters, axis ratios, and position angles.
• Analyze the distribution of bright galaxies (B-mag < ~18) for large-scale structure research.
• Benchmark galaxy property measurement methods using the EPIDEMIC homogenization technique described.

Strengths

• Contains approximately one million confirmed galaxies, providing a substantial sample.
• Coordinates have a typical accuracy better than 2 arcseconds.
• Properties like diameters and axis ratios are homogenized to a standard system (RC2 at 25 B-mag/arcsec²).
• Names are cross-referenced from 50 catalogs and checked for compatibility with NED and SIMBAD.

Limitations

• Row count and file size are unknown, which may limit suitability assessment.
• Column-level documentation is absent; field semantics must be inferred after download.
• Last updated metadata shows a future date (2026-03 13); actual data freshness should be verified.

Provenance

Source

NASA HEASARC, based on CDS catalog VII/237 from the HYPERLEDA database.

Collection Method

Compilation and homogenization of data from multiple astronomical catalogs.

Time Range

Catalog version is 2003.

Freshness

Catalog version is from 2003; data was ingested by HEASARC in July 2004.

Geography

Extragalactic; covers the observable sky.