Chandra Observations: X-Ray Observatory Targets and Calibration Data
Updated 3mo ago
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Description
Chandra X-Ray Observatory observations include Performance Verification, calibration, and all subsequent cycles of Guaranteed Time and General Observer targets. The HEASARC updates this database twice-weekly by querying the Chandra X-Ray Center. NASA HEASARC provides this service, with data products available from the Chandra Data Archive for archived observations.
Use Cases
Analyzing observation scheduling and target selection based on mission cycle and observer type (GTO, GO, DDT)
Studying calibration data trends based on entries flagged with Type = CAL
Tracking data availability and archival status for specific astronomical targets
Researching the temporal distribution of observations across the mission's operational phases
Strengths
Includes all observations from the mission's Performance Verification and Calibration phase onward
Updated on a twice-weekly basis, suggesting relatively current metadata
Data from archived observations is retrievable from a public mirror of the Chandra Data Archive
Limitations
Column-level documentation is absent; field semantics must be inferred after download
Row count is unknown, which may limit suitability assessment
Description metadata is limited; actual data quality requires manual inspection after download
Provenance
Source
Chandra X-Ray Center (CXC), NASA HEASARC
Collection Method
Updated twice-weekly by querying the database table at the CXC website
Time Range
From the mission's Performance Verification and Calibration phase onward
Freshness
Last updated 2026-03-13 20:10:03.823867; updated twice-weekly.
Geography
Celestial observations, spatial coverage not specified
License is 'other-license-specified'; the CXC must be acknowledged as the source of Chandra data.