Hubble Sat Spotter

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Next pass computing…

Looking down drag to spin, click to move

Looking up the sky above the observer

Min elevation How high above the horizon a pass must peak before the device SDK schedules a transmission for it. Higher passes give a shorter, stronger link but come less often. SDK default is 45°, allowed range 30–90°. Shown as the dashed ring on the sky chart. 45°

Pass Planning

SatelliteRisePeakSetMax elSDK TX window (160 s)SDK

Min elevation, side view drag to turn and tilt

Orbits are propagated in your browser with SGP4 from Hubble's published TLEs. Using the built-in snapshot from Oct 8, 2026. Elements more than a few days old drift by seconds to minutes.

"SDK" marks passes the device SDK's hubble_sat_next_pass_get() would schedule at the current minimum elevation (default 45°, allowed 30–90°). Its window is 8 retries × 20 s = 160 s centered on the peak. A cross-check of the SDK code against SGP4 for Durham agreed to within about 15 s on peak time.

The sat-continuous firmware transmits every 10 s regardless, so any pass above the horizon is a chance for a packet to land. Higher passes mean a shorter path and a stronger link.

sky view (beta)