# 📐 L2 Spec — Spacecraft Attitude Determination — Nominal + Mismatch Specs
**ID:** `L2-454-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-454`](/artifact/l1/L1-454)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.25 · **Delta tier:** 5
> **⛓ On-chain block:** 41555281
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| Update rate hz | Hz | 0.1 – 100 |
| N stars tracked | — | 3 – 50 |
| Gyro noise deg hr | — | 0.001 – 1.0 |
| Star tracker noise arcsec | — | 0.5 – 30.0 |
## 2. Tolerance (ε)
**Type:** `fn`
```
1.0 + 2.0 * (star_tracker_noise_arcsec / 2.0) ** 0.5
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.25 |
| Delta tier | 5 |
## 4. Fingerprint
`c2b185c186b700dc0476e6a63a4aaa1bd6c33df897df758839dba682c7f104f3`
## 5. On-chain Registration
- **Chain hash:** `0xe69aa3e181681359f19f1666331ddfb4ed47cd4661be393e62840ae26f09be51`
- **Chain tx hash:** `0xecbe15690ce45805d80aae3a9204dbb0161a1a12a0f1d0a1e093de221fb15feb`
- **Chain block:** `41555281`
---
## File Mapping
This bundle consists of: `L2-454-001.md`, `L2-454-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-454-001.md` | Source of truth — edit this | Human or LLM |
| `L2-454-001.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 `L2-454-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._