SAGE IRAC Offset Position Catalog: Spitzer Telescope Calibration Field

The SAGE IRAC Offset Position Catalog is a calibration dataset from the Spitzer Space Telescope's SAGE Legacy Project, which surveyed the Large Magellanic Cloud. The project has revealed over 6 million sources, including approximately 150,000 evolved stars and 50,000 young stellar objects. This specific catalog focuses on a calibration field at RA=82.25d Dec=-45.95d, applying strict signal-to-noise and source exclusion criteria.

Use Cases

• Calibrating infrared photometry pipelines based on the described signal-to-noise and source exclusion criteria.
• Studying the lifecycle of observable matter in galaxies based on the survey's focus on evolved stars and young stellar objects.
• Analyzing the physical processes of the interstellar medium based on the survey's measurement of column densities.
• Comparing source catalogs and archives based on the described differences in flux completeness and uncertainty.

Strengths

• Derived from the Spitzer Space Telescope's SAGE Legacy Project, a major astronomical survey.
• Catalog includes over 6 million sources with specific counts for stellar object types.
• Applies defined quality criteria, such as signal-to-noise thresholds greater than [6,6,6,10] for specific IRAC bands.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• The description notes that the associated archive has more sources but with greater uncertainty.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Observational data from the Spitzer Space Telescope's SAGE Legacy Project survey.

Time Range

null

Freshness

Last updated 2026-03-13 17:59:11.912198; freshness should be verified.

Geography

Calibration field at RA=82.25d Dec=-45.95d; primary survey covers the Large Magellanic Cloud.