COCD: Catalog of Open Cluster Data for 520 Stellar Groups

The Catalog of Open Cluster Data (COCD) contains parameters for 513 open clusters and 7 compact associations. It was created by NASA HEASARC in May 2011 based on studies of about 33,000 possible member stars from the All-Sky Compiled Catalog (ASCC-2.5). The catalog provides established parameters like cluster distances, proper motions, radial velocities, and ages.

Use Cases

• Analyzing galactic structure and stellar distribution based on cluster distances and positions.
• Studying stellar kinematics and cluster dynamics based on mean proper motions and radial velocities.
• Investigating stellar evolution and cluster formation history based on derived cluster ages.
• Validating cluster membership and parameter determination methods using the associated Open Cluster Diagrams Atlas (OCDA).

Strengths

• Contains parameters for a substantial sample of 520 stellar groups (513 clusters, 7 associations).
• Derived from a high-precision, homogeneous source catalog (ASCC-2.5) of 2.5 million stars.
• Includes cluster distances for 200 clusters, radial velocities for 94 clusters, and ages for 195 clusters derived for the first time.
• Provides supporting diagrammatic data (OCDA) for visualizing membership and parameter accuracy.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last updated 2026-03-13 19:21:47.168641; freshness should be verified as the underlying studies are from 2001-2004.

Provenance

Source

NASA HEASARC, based on CDS Catalog J/A+A/438/1163.

Collection Method

Derived from studies of wide neighborhoods of clusters using data from the All-Sky Compiled Catalog of 2.5 Million Stars (ASCC-2.5).

Time Range

Underlying stellar data from the ASCC-2.5 (Kharchenko 2001).

Freshness

Catalog created in 2011 based on studies from 2001-2004; metadata shows a future last update date.

Geography

All-sky coverage.