SDWFS: Spitzer Deep Wide-Field Survey 8 Micron Epoch 3 Catalog

The Boötes field survey covers 10 square degrees of infrared observations from the Spitzer Space Telescope. This catalog from the Spitzer Cycle 4 Legacy project provides four-epoch data for selecting variable objects and studying galaxy evolution out to redshift z ~ 3. The National Aeronautics and Space Administration produced the dataset, which was last updated on 2026-03 13.

Use Cases

• Identify infrared-variable astronomical objects based on four epochs of observation mentioned in the description
• Select high proper motion objects based on the multi-year timescale data
• Characterize galaxy evolution beyond redshift z ~ 1.5 based on the survey's sensitivity and large volume
• Analyze source photometry using the three measurement methods (4 arcsec, 6 arcsec, Kron radius apertures) described

Strengths

• Covers a 10 square degree field, providing a large survey volume with reduced cosmic variance
• Includes four epochs of data, enabling time-series analysis over years
• Reports Vega magnitudes for four IRAC bands (3.6, 4.5, 5.8, and 8 microns)
• Source coordinates are matched to 2MASS catalog positions within 0.2 arcsec accuracy

Limitations

• Column-level documentation is absent; field semantics must be inferred after download
• Row count is unknown, which may limit suitability assessment
• File formats include BIN and HTML, which may require specialized tools for access

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Observations from the IRAC instrument on the Spitzer Space Telescope, part of the Spitzer Cycle 4 Legacy project.

Time Range

Covers four epochs, implying observations separated by years, but specific dates are not provided.

Freshness

Last updated 2026-03-13 17:50:06.531693; freshness should be verified

Geography

Observations of the Boötes field in the sky.