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GET /v1/proper-motion

Tangential velocity

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Custom headers (optional)
api.oanor.com/parallax-api

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Code snippets

curl "https://api.oanor.com/parallax-api/v1/proper-motion" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/parallax-api/v1/proper-motion", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/parallax-api/v1/proper-motion");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);
import requests
requests.get(
    "https://api.oanor.com/parallax-api/v1/proper-motion",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "note": "v_t = 4.74047·μ(arcsec/yr)·d(pc) km/s. Barnard's Star (μ≈10.39 arcsec/yr, d≈1.83 pc) has v_t ≈ 90 km/s.",
        "inputs": {
            "distance_parsec": 1.83,
            "proper_motion_arcsec_yr": 10.39
        },
        "tangential_velocity_kms": 90.133883
    },
    "meta": {
        "timestamp": "2026-06-05T19:50:26.577Z",
        "request_id": "4f2f5786-4d5f-4fcb-b5aa-d9e584ac39d4"
    },
    "status": "ok",
    "message": "Tangential velocity",
    "success": true
}