UAL639 United
Airbus A319 132 · N871UA · SFO → ?
· 1:26Quality 86side-onturned 47°Dead-zone wrap
Software-steadied: the hops of the camera motor are smoothed out (plane wobble −59%). Download
Trace
Where the aircraft sat in the frame, second by second. Click the chart to jump the video there.
—FOV —az —el —pose —
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Lock
Events
Tracking metrics
How well the camera kept the aircraft centred. Tap a metric for what it means and what good looks like.
- Lockshare of the pass
- 59%
- First lockfrom target selected
- 4.7 s
- Centring, medianaz / el while locked
- 0.59° / 0.44°
- Centring, 90th pctaz / el while locked
- 3.81° / 1.22°
- Tightest field of viewhorizontal
- 4.1°
- Time to 8°from first lock
- 4.5 s
- Time to tightestfrom first lock
- 72.5 s
- Time at telefield of view ≤ 5.5°
- 12.4 s
- Jitter at teleaz / el, standard deviation
- 0.20° / 0.34°
- Swing at teleaz / el, peak to peak
- 0.91° / 1.23°
- Pan reversalsper 10 s at tele
- 1.6
- Largest pan hopin any 1 s at tele
- 1.94°
- Largest tilt hopin any 1 s at tele
- 2.84°
- Pose error, mediancommand vs camera
- 0.78°
- Largest correctionvision vs prediction
- 1.45°
- Zoom steps
- 56
Aircraft & route
- Flight
- UAL639
- Registration
- N871UA
- Type
- Airbus A319 132
- Airline
- United
- From
- SFO
- To
- —
- Ground speed
- 297 kt
- Altitude at closest
- 8,425 ft
- Vertical rate
- +3,776 ft/min
- Category
- A3
- ICAO hex
- abfbd0
Pass geometry
- Max elevation
- 50.7°
- Elevation at start → end
- 20.1° → 19.2°
- Azimuth at start → end
- 338° NNW → 202° SSW
- Closest-approach azimuth
- 266° W
- Minimum slant range
- 3.4 km
- Heading at closest
- 178° S
- Aspect at closest
- side-on (88°)
- Turn
- turned 47°
- Departure
- Yes — climbing out after take-off
- Zenith pass
- No
- Dead-zone wrap
- Yes — pan pre-positioned across the stop
- Duration
- 1:26 (85.5 s)
- Lock
- 59%
Build & tuning
The tracker build that flew this pass and the live settings that mattered, so passes can be compared across changes.
- Build
- 2026-10-13i — slower zoom ladder (one rung, 1.5 s)
- Commit
- 181d1fa+wip
- Node
- v22.22.2
- Camera
- TONGVEO 20x PTZ · 1920×1080 @ 30 fps
- Clip
- 40.3 MB · 82.6 s · offset -1.6 s
- pursuit
- velocity
- maxLeadSec
- 3
- panLatencySec
- 0.6
- tiltLatencySec
- 0.4
- rippleDeg
- 0.5
- rippleTeleDeg
- 0.25
- rateFloorDegPerDps
- 2.5
- rateFloorMaxDeg
- 12
- lockedSigmaDeg
- 0.35
- correctionSlewDps
- 2.5
- kp
- 1
- ki
- 0.6
This clip and poster are © Skylight (Cameron Paczek): free for non-commercial use with credit to skylightceiling.com, not MIT. License