FA-56164 / Astronomical coordinate conventions / Member archive

Astro frequency comb coordinate: Frequency-comb coordinate drops or scales the carrier-envelope offset · case 04

The adapter reports an incorrect mode frequency while other fields remain valid.

Member previewVariant 4 · 3 implementations · 6 checks per implementation

Case contract

An astronomical calibration comb has carrier-envelope offset o, repetition frequency r>0, integer mode m, and filter stride s with first retained mode b. Frequencies f=o+m*r. Detector channel k in the filtered comb corresponds to mode b+k*s; c is a supplied speed constant. Output fields are defined by: mode_frequency = d['o']+d['m']*d['r']; retained_mode = d['b']+d['k']*d['s']; retained_frequency = d['o']+(d['b']+d['k']*d['s'])*d['r']; line_spacing = d['s']*d['r']; mode_wavelength = d['c']/(d['o']+d['m']*d['r']); first_retained_frequency = d['o']+d['b']*d['r']

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	`{"first_retained_frequency": 26, "line_spacing": 30, "mode_frequency": 40, "mode_wavelength": 2.608695652173913, "retained_frequency": 176, "retained_mode": 17}`	`{"first_retained_frequency": 26, "line_spacing": 30, "mode_frequency": 46, "mode_wavelength": 2.608695652173913, "retained_frequency": 176, "retained_mode": 17}`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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