# 📐  L2 Spec — Satellite Gravity Gradiometry (GOCE) — Nominal + Mismatch Specs

**ID:** `L2-471-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-471`](/artifact/l1/L1-471)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.42 · **Delta tier:** 5
> **⛓ On-chain block:** 41555302

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| N arc days | — | 100 – 1825 |
| N max degree | — | 50 – 300 |
| Noise e sqrt hz | Hz | 1.0 – 50.0 |
| Orbit altitude km | km | 200 – 500 |

## 2. Tolerance (ε)

**Type:** `fn`

```
0.5 + 0.5 * (noise_E_sqrt_Hz / 5.0) ** 0.5
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.42 |
| Delta tier | 5 |

## 4. Fingerprint

`6faa46cd2cc0949e8460ffe4df118d911408a21b7bfe9dbb533e3e685b1f6258`

## 5. On-chain Registration

- **Chain hash:** `0x18222ce0a292b2a157083b5fc876ed98042d76698899b3ded950cd01f1dacedc`
- **Chain tx hash:** `0xf4fe3b70a9a2e45fb310f735f73b3f0977cbb6524cfbad262719f76b1946630a`
- **Chain block:** `41555302`

---

## File Mapping

This bundle consists of: `L2-471-001.md`, `L2-471-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-471-001.md` | Source of truth — edit this | Human or LLM |
| `L2-471-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |

**Prompt for your LLM after editing this Markdown:**

> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.

_This Markdown was auto-synthesized from the catalog row for `L2-471-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._