HEAO 1 A3 MC LASS Catalog: X-ray Sources from 1977-1979

From August 19, 1977, to January 9, 1979, the HEAO 1 A3 experiment collected X-ray source data using modulation collimators with a 4x4 degree field of view. This catalog contains possible X-ray sources identified by the HEAO 1 A1 instrument. The data is provided as a service by NASA's High Energy Astrophysics Science Archive Research Center (HEASARC).

Use Cases

• Cross-reference and validate X-ray source detections based on the catalog's list of possible HEAO 1 A1 sources.
• Study the spatial distribution of X-ray sources based on data from the MC experiment's 4x4 degree field of view.
• Analyze the temporal stability of X-ray sources using data collected during the defined 1977-1979 observation period.

Strengths

• Data originates from a defined NASA satellite mission (HEAO 1) with a specific operational period from August 1977 to January 1979.
• Instrument specifications are provided, including a 4x4 degree field of view for the modulation collimators.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for large-scale analysis.

Provenance

Source

National Aeronautics and Space Administration, NASA HEASARC

Collection Method

Collected by the HEAO 1 A3 MC LASS experiment using modulation collimators.

Time Range

August 19, 1977 to January 9, 1979

Freshness

Last updated 2026-03-13 18:22:04.539835; freshness should be verified.

Geography

Space-based observations; no specific terrestrial geography.