Source: https://guthlabs.ai/docs/instruments/absolute-magnitude-of-solar-system-body-h-diameter/implementation/

instrument implementation / implementation-contract

# Absolute Magnitude of Solar System Body (H) ↔ Diameter implementation

A source-bound implementation contract for Absolute Magnitude of Solar System Body (H) ↔ Diameter; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## 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**: t5-194

**Effect**: Computation or source lookup only

## Input and validation requirements

The specification leaves the default albedo value unspecified, does not explicitly state that albedo must be a fraction in the interval 0 < p <= 1, and provides no rejection behavior for p = 0 or p > 1. It also has no genuine piecewise formula branch; the tested switch is only a physical-validity gate.

## 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": {
    "H": 0,
    "albedo_p": 1
  },
  "expected_outputs": {
    "diameter_km": 1329
  },
  "working": "sqrt(p)=sqrt(1)=1.  -H/5=-0/5=0.  10^0=1.  D=1329/1*1=1329 km."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/absolute-magnitude-of-solar-system-body-h-diameter/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/absolute-magnitude-of-solar-system-body-h-diameter/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/absolute-magnitude-of-solar-system-body-h-diameter/qualification/>)

## Sources and evidence

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

- `VERIFIED_LEDGER.json`

- `evidence-tranche5/tranche5-results.json`