FA-54978 / Astronomical coordinate conventions / Member archive

Detector mosaic sections: First detector coordinate after a chip gap includes the wrong edge · case 03

The adapter reports an incorrect b first pixel while other fields remain valid.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Two readout amplifiers cover a focal plane with overscan removed. Amplifier B is physically reversed. Detector labels are one-based; chip gap has no samples. Serial overscan is measured in columns and parallel overscan in rows. Output fields are defined by: a_science_column = d['x']-d['serial']; b_detector_column = d['a']+d['gap']+d['b']+1-d['x']; science_row = d['y']-d['parallel']; b_first_pixel = d['a']+d['gap']+1; mosaic_extent = d['a']+d['gap']+d['b']; science_rows = d['rows']-d['parallel']

Why this case matters

Catalog, detector, sky-coordinate, and spectroscopy adapters must preserve the association between numeric coordinates and their declared reference conventions.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
astronomical fixture 0	`{"a_science_column": 3, "b_detector_column": 21, "b_first_pixel": 13, "mosaic_extent": 25, "science_row": 3, "science_rows": 16}`	`{"a_science_column": 3, "b_detector_column": 21, "b_first_pixel": 16, "mosaic_extent": 25, "science_row": 3, "science_rows": 16}`	Failed

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