UAL838 United
Boeing 777 300ER · N2846U · NRT → SFO
· 1:26side-on
Software-steadied: the hops of the camera motor are smoothed out (plane wobble −68%). 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
- 33%
- First lockfrom target selected
- 11.9 s
- Centring, medianaz / el while locked
- 0.44° / 0.65°
- Centring, 90th pctaz / el while locked
- 1.70° / 1.13°
- Tightest field of viewhorizontal
- 4.1°
- Time to 8°from first lock
- 9.8 s
- Time to tightestfrom first lock
- 15.8 s
- Time at telefield of view ≤ 5.5°
- 2.0 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
- 1.13°
- Largest tilt hopin any 1 s at tele
- 1.41°
- Pose error, mediancommand vs camera
- 0.93°
- Largest correctionvision vs prediction
- 0.80°
- Zoom steps
- 85
Aircraft & route
- Flight
- UAL838
- Registration
- N2846U
- Type
- Boeing 777 300ER
- Airline
- United
- From
- NRT · Tokyo
- To
- SFO · San Francisco
- Ground speed
- 280 kt
- Altitude at closest
- 11,125 ft
- Vertical rate
- +64 ft/min
- Category
- A5
- ICAO hex
- a2e014
Pass geometry
- Max elevation
- 70.7°
- Elevation at start → end
- 21.4° → 40.0°
- Azimuth at start → end
- 328° NNW → 123° ESE
- Closest-approach azimuth
- 48° NE
- Minimum slant range
- 3.6 km
- Heading at closest
- 139° SE
- Aspect at closest
- side-on (89°)
- Turn
- straight (7°)
- Departure
- No
- Zenith pass
- No
- Dead-zone wrap
- No
- Duration
- 1:26 (86.3 s)
- Lock
- 33%
Build & tuning
The tracker build that flew this pass and the live settings that mattered, so passes can be compared across changes.
- Build
- 2026-10-13b — vision pauses during zoom transit
- Commit
- 181d1fa+wip
- Node
- v22.22.2
- Camera
- TONGVEO 20x PTZ · 1920×1080 @ 30 fps
- Clip
- 43.0 MB · 86.0 s · offset -1.3 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