# celestrak.satellite.tle

Retrieve the current Two-Line Element (TLE) orbital data for a specific satellite using its NORAD catalog number. Returns the full GP (General Perturbations) element set: epoch, inclination, RAAN, eccentricity, argument of perigee, mean anomaly, mean motion (revolutions/day), B* drag coefficient, and computed orbital period in minutes. Data is sourced from the US Space Force 18th Space Control Squadron via CelesTrak. Useful for orbital mechanics calculations, satellite pass predictions, and tracking any of the 27,000+ catalogued space objects. Popular NORAD IDs: 25544 (ISS), 20580 (Hubble), 33591 (NOAA-18).

Agent View of the PolicyLayer registry record for `celestrak.satellite.tle`. HTML page: https://policylayer.com/tools/io-github-whiteknightonhorse-apibase/celestrak.satellite.tle

## Facts

- Tool: `celestrak.satellite.tle`
- Server: Apibase (`apibase-mcp-client`) — https://policylayer.com/tools/io-github-whiteknightonhorse-apibase.md
- Install: `npx -y apibase-mcp-client`
- Homepage: https://github.com/whiteknightonhorse/APIbase
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server rate-limited: no
- Parameters: 1 (1 required)
- Recommended policy verdict: Rate-limited

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `catnr` | string | number | yes | NORAD catalog number (satellite ID). Examples: 25544 (ISS), 20580 (Hubble Space Telescope), 48274 (Starlink-1007). Integer between 1 and 99999. Obtain from cele |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "celestrak.satellite.tle",
    "arguments": {
      "catnr": 0
    }
  }
}
```

## Why celestrak.satellite.tle is rated Medium

An AI agent can call celestrak.satellite.tle faster than any human can review: one bad instruction and it creates or modifies resources in Apibase by the hundred, each call as confident as the last.

## Use case

AI agents use celestrak.satellite.tle to create or update resources in Apibase, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Apibase environment.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Apibase:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "celestrak.satellite.tle": {
      "limits": [
        {
          "counter": "celestrak.satellite.tle_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

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## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=io-github-whiteknightonhorse-apibase · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-whiteknightonhorse-apibase