OSCARLOCATOR Simulator

An interactive OSCARLOCATOR: a polar or QTH-centred azimuthal-equidistant map with the satellite's ground-track arc, a range circle over your station, and the satellite's footprint. Drive it live in real time, pin the equator crossing to a chosen longitude and step the minutes after the crossing, or jump to the next pass. Positions come from a verified SGP4/SDP4 propagator.

EQX lon
+min
Sub-sat
Az/El from QTH
Range
Visible

Sweep the arc

Equator-crossing longitude
Minutes after crossing0

Drag the disc to rotate the arc by hand, or seed it to the next ascending pass over your station.

Station & satellite

Live AMSAT elements load automatically. Press Refresh to fetch again.

Orbital elements

Next passes over your QTH

The next ten times the satellite rises above your horizon, with start (AOS), peak, end (LOS), duration, and maximum elevation. Higher max elevation means a stronger, longer pass. Use Seed to jump the map to that pass.

AOS (UTC)PeakLOSDurMax el
Load a satellite to list passes.

Reference orbits — equator crossings

The first equator crossing of each UTC day for the loaded satellite: the time and longitude to set on a real OSCARLOCATOR. Northern-hemisphere stations use the ascending node; southern-hemisphere stations use the descending node — in both the polar and QTH-centred views — so the listed crossing always matches the pass you track.

UTC dateAsc. UTCLongitude
Load a satellite to build the table.