UAL948 United
Boeing 787-9 · N81113 · SFO → LHR
· 0:41Quality 83side-on
Software-steadied: the hops of the camera motor are smoothed out (plane wobble −77%). 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
- 90%
- First lockfrom target selected
- 4.3 s
- Centring, medianaz / el while locked
- 0.39° / 0.36°
- Centring, 90th pctaz / el while locked
- 2.55° / 4.27°
- Tightest field of viewhorizontal
- 6.6°
- Time to 8°from first lock
- 32.5 s
- Time to tightestfrom first lock
- 33.0 s
- Time at telefield of view ≤ 5.5°
- 0.0 s
- Jitter at teleaz / el, standard deviation
- —
- Swing at teleaz / el, peak to peak
- —
- Pan reversalsper 10 s at tele
- —
- Largest pan hopin any 1 s at tele
- —
- Largest tilt hopin any 1 s at tele
- —
- Pose error, mediancommand vs camera
- 1.26°
- Largest correctionvision vs prediction
- 2.67°
- Zoom steps
- 25
Aircraft & route
- Flight
- UAL948
- Registration
- N81113
- Type
- Boeing 787-9
- Airline
- United
- From
- SFO · San Francisco
- To
- LHR · London
- Ground speed
- 178 kt
- Altitude at closest
- 1,175 ft
- Vertical rate
- —
- Category
- A5
- ICAO hex
- ab0faa
Pass geometry
- Max elevation
- 74.6°
- Elevation at start → end
- 16.4° → 13.1°
- Azimuth at start → end
- 111° ESE → 299° WNW
- Closest-approach azimuth
- 23° NNE
- Minimum slant range
- 359 m
- Heading at closest
- 297° WNW
- Aspect at closest
- side-on (86°)
- Turn
- straight (0°)
- Departure
- Yes — climbing out after take-off
- Zenith pass
- No
- Dead-zone wrap
- No
- Duration
- 0:41 (40.6 s)
- Lock
- 90%
Build & tuning
The tracker build that flew this pass and the live settings that mattered, so passes can be compared across changes.
- Build
- 2026-10-14l — vision lock coasts with the plane; a zoom ends a focus drive
- Commit
- f5b573a
- Node
- v22.22.2
- Camera
- TONGVEO 20x PTZ · 1920×1080 @ 30 fps
- Clip
- 20.5 MB · 41.0 s · offset -1.6 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
- -0.22
- 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