Ground Passes

curl -X POST https://sim.rotastellar.com/v1/passes \ -H "Content-Type: application/json" \ -d '{ "elements": { "altitude_km": 550, "inclination_deg": 53 }, "duration_hours": 24, "min_elevation_deg": 10 }'

{ "passes": [ { "station_id": "gs_svalbard", "station_name": "Svalbard", "provider": "KSAT", "aos": "2026-03-08T12:34:56Z", "los": "2026-03-08T12:45:23Z", "duration_s": 627, "max_elevation_deg": 45.6, "points": [ { "timestamp": "2026-03-08T12:34:56Z", "elevation_deg": 10.0, "azimuth_deg": 90.5, "range_km": 2500.1 } ] } ], "count": 8, "start": "2026-03-08T12:00:00Z", "duration_hours": 24, "stations_checked": 12 }

Base URL: https://sim.rotastellar.com — No API key required.

Request

object

required

Orbital elements. See Orbital Elements.

string

ISO 8601 start time. Defaults to current time.

number

Prediction window in hours. Default: 24. Max: 72.

number

Minimum satellite elevation above horizon (degrees). Default: 5.

array

Custom ground station list. Defaults to the 12-station global network (KSAT, NASA, AWS). Each station needs id, name, lat, lon.

curl -X POST https://sim.rotastellar.com/v1/passes \
  -H "Content-Type: application/json" \
  -d '{
    "elements": {
      "altitude_km": 550,
      "inclination_deg": 53
    },
    "duration_hours": 24,
    "min_elevation_deg": 10
  }'

{
  "passes": [
    {
      "station_id": "gs_svalbard",
      "station_name": "Svalbard",
      "provider": "KSAT",
      "aos": "2026-03-08T12:34:56Z",
      "los": "2026-03-08T12:45:23Z",
      "duration_s": 627,
      "max_elevation_deg": 45.6,
      "points": [
        {
          "timestamp": "2026-03-08T12:34:56Z",
          "elevation_deg": 10.0,
          "azimuth_deg": 90.5,
          "range_km": 2500.1
        }
      ]
    }
  ],
  "count": 8,
  "start": "2026-03-08T12:00:00Z",
  "duration_hours": 24,
  "stations_checked": 12
}

Default Ground Stations

The service includes a 12-station global network:

Station	Location	Provider
Svalbard	78.2°N, 15.4°E	KSAT
Troll	72.0°S, 2.5°E	KSAT
Awarua	46.5°S, 168.4°E	KSAT
Fairbanks	64.9°N, 147.9°W	NASA
Wallops	37.9°N, 75.5°W	NASA
McMurdo	77.9°S, 166.7°E	NASA
Singapore	1.4°N, 103.8°E	AWS
Bahrain	26.1°N, 50.5°E	AWS
Oregon	43.8°N, 120.6°W	AWS
Cape Town	33.9°S, 18.4°E	AWS
Stockholm	59.3°N, 18.1°E	AWS
Sydney	33.9°S, 151.2°E	AWS

Workloads

Overview

CAE

Deployments

Sim

Request

Default Ground Stations

​Request

​Default Ground Stations

Request

Default Ground Stations