UAL857 United
Boeing 777 300ER · N2639U · SFO → ?
· 1:05Quality 79nose/tail
Software-steadied: the hops of the camera motor are smoothed out (plane wobble −84%). Download
Trace
Where the aircraft sat in the frame, second by second. Click the chart to jump the video there.
—FOV —az —el —pose —
Loading telemetry…
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
- 65%
- First lockfrom target selected
- 21.2 s
- Centring, medianaz / el while locked
- 0.52° / 0.63°
- Centring, 90th pctaz / el while locked
- 6.65° / 2.81°
- Tightest field of viewhorizontal
- 4.1°
- Time to 8°from first lock
- 33.5 s
- Time to tightestfrom first lock
- —
- Time at telefield of view ≤ 5.5°
- 0.8 s
- Jitter at teleaz / el, standard deviation
- —
- Swing at teleaz / el, peak to peak
- —
- Pan reversalsper 10 s at tele
- 0.0
- Largest pan hopin any 1 s at tele
- —
- Largest tilt hopin any 1 s at tele
- —
- Pose error, mediancommand vs camera
- 1.03°
- Largest correctionvision vs prediction
- 1.55°
- Zoom steps
- 56
Aircraft & route
- Flight
- UAL857
- Registration
- N2639U
- Type
- Boeing 777 300ER (B77W)
- Airline
- United
- From
- SFO
- To
- —
- Ground speed
- 196 kt
- Altitude at closest
- 1,275 ft
- Vertical rate
- +2,880 ft/min
- Category
- A5
- ICAO hex
- a28dc8
Pass geometry
- Max elevation
- 83.1°
- Elevation at start → end
- 0.1° → 12.0°
- Azimuth at start → end
- 116° ESE → 299° WNW
- Closest-approach azimuth
- 31° NNE
- Minimum slant range
- 419 m
- Heading at closest
- 297° WNW
- Aspect at closest
- nose/tail (6°)
- Turn
- straight (0°)
- Departure
- Yes — climbing out after take-off
- Zenith pass
- No
- Dead-zone wrap
- No
- Duration
- 1:05 (64.6 s)
- Lock
- 65%
Build & tuning
The tracker build that flew this pass and the live settings that mattered, so passes can be compared across changes.
- Build
- 2026-10-15q — drive speed latched at the lens position; measured speed bytes only; auto-cal keeps gains
- Commit
- 44f2d6a
- Node
- v22.22.2
- Camera
- TONGVEO 20x PTZ · 1920×1080 @ 30 fps
- Clip
- 30.9 MB · 63.1 s · offset -1.4 s
- pursuit
- velocity
- maxLeadSec
- 3
- panLatencySec
- 0.6
- tiltLatencySec
- 0.4
- rippleDeg
- 0.5
- rippleTeleDeg
- 0.25
- maxSpeedStepFwps
- 0.45
- speedReachFrac
- 0.8
- lockedSigmaDeg
- 0.35
- sigmaGrowthDps
- 0.1
- aimLeadSec
- -0.27
- 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