FA-55569 / Astronomical coordinate conventions / Member archive

Spectral reciprocal density: Reciprocal spectral coordinates retain wavelength edge ordering · case 04

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

Member previewVariant 4 · 3 implementations · 6 checks per implementation

Case contract

A spectral coordinate adapter uses positive wavelength L and supplied speed c. Frequency=c/L. A finite wavelength bin has endpoints lo<hi; its frequency endpoints reverse order. Density F_lambda transforms by L**2/c at the sample center. No relativistic or unit inference is performed. Output fields are defined by: frequency = d['c']/d['L']; frequency_edges = [d['c']/d['hi'],d['c']/d['lo']]; frequency_density = d['F']*d['L']**2/d['c']; frequency_bandwidth = d['c']/d['lo']-d['c']/d['hi']; local_frequency_step = -d['c']*d['dL']/d['L']**2; bin_energy_proxy = d['F']*d['dL']

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	`{"bin_energy_proxy": 6, "frequency": 17.142857142857142, "frequency_bandwidth": 40.0, "frequency_density": 1.225, "frequency_edges": [60.0, 20.0], "local_frequency_step": -4.8979591836734695}`	`{"bin_energy_proxy": 6, "frequency": 17.142857142857142, "frequency_bandwidth": 40.0, "frequency_density": 1.225, "frequency_edges": [20.0, 60.0], "local_frequency_step": -4.8979591836734695}`	Failed

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

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