FA-56184 / Astronomical coordinate conventions / Member archive
Astro frequency comb coordinate: Comb wavelength calibration evaluates the reciprocal before adding mode frequency · case 04
The adapter reports an incorrect mode wavelength while other fields remain valid.
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 fixtureThis 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": 46, "mode_wavelength": 3.0, "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 |
MEMBER ARCHIVE
The complete case is available to members.
This record includes three runnable implementations, regression fixtures, execution results, and source hashes.
Member access is invitation-based. Sign in with your invited account to inspect the sources.
Sign in to the archive ↗