Science
Two-Body State Vector Propagator
Propagate a spacecraft/satellite state vector (r₀, v₀) to time t₀+Δt under two-body gravity via the universal-variable (f-and-g) method, and derive the classical orbital elements
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Quick start
Call this tool from your code in three languages.
cURL
curl -X POST 'https://api.elysiatools.com/en/api/tools/two-body-state-vector-propagator' \
-H 'Content-Type: application/json' \
-d '{"centralBody":"earth","customMu":0,"distUnit":"km","r0":"7000,0,0","v0":"0,7546,0","dt":3600}'API reference
Send a POST request with your inputs as JSON. File parameters require a separate upload first.
Endpoint
HTTP
POST https://api.elysiatools.com/en/api/tools/two-body-state-vector-propagatorParameters
| Name | Type | Required | Description |
|---|---|---|---|
| centralBody | select | No | — |
| customMu | number | No | — |
| distUnit | select | No | — |
| r0 | text | Yes | — |
| v0 | text | Yes | — |
| dt |
MCP integration
Add this tool to your Model Context Protocol server so AI agents can list and call it.
Server configuration
Add this block to your MCP client configuration:
mcp.json
{
"mcpServers": {
"elysiatools-two-body-state-vector-propagator": {
"name": "two-body-state-vector-propagator",
"description": "Propagate a spacecraft/satellite state vector (r₀, v₀) to time t₀+Δt under two-body gravity via the universal-variable (f-and-g) method, and derive the classical orbital elements",
"baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=two-body-state-vector-propagator",
"command": "",
"args": [],
"env": {},
"isActive": true,
"type": "sse"
}
}
}List available tools
After connecting to the SSE endpoint, list the exposed tools:
tools/list
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/list"
}Call this tool
Invoke the tool by its id, passing arguments built from its parameters:
tools/call
{
"jsonrpc": "2.0",
"id": 2,
"method": "tools/call",
"params": {
"name": "two-body-state-vector-propagator",
"arguments": {
"centralBody": "earth",
"customMu": 0,
"distUnit": "km",
"r0": "7000,0,0",
"v0": "0,7546,0",
"dt": 3600
}
}
}Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).
Questions or issues? Contact [email protected]