Limiting Magnitude Estimator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t4-017

Effect

Computation or source lookup only

Input and validation requirements

The stated arithmetic formula produces undefined results for zero or negative aperture diameters, so the instrument must validate that D_mm is strictly positive. A unit-convention mismatch can also produce a large incorrect result if an aperture entered in inches is treated as millimetres.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "aperture_diameter_mm": 70,
    "sky_conditions_modifier": 0
  },
  "expected_outputs": {
    "limiting_magnitude": 11.92549
  },
  "working": "D = 70 mm. log10(70) = 1.845098. 5 × 1.845098 = 9.225490. 2.7 + 9.225490 = 11.925490. The modifier is not applied because its operation is unspecified."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche4/tranche4-results.json