UAL927 United
Boeing 787 9 · N29985 · FRA → SFO
· 0:34Quality 87side-on
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
- 87%
- First lockfrom target selected
- 4.6 s
- Centring, medianaz / el while locked
- 0.09° / 0.15°
- Centring, 90th pctaz / el while locked
- 0.29° / 0.40°
- Tightest field of viewhorizontal
- 3.4°
- Time to 8°from first lock
- 3.4 s
- Time to tightestfrom first lock
- —
- Time at telefield of view ≤ 5.5°
- 26.2 s
- Jitter at teleaz / el, standard deviation
- 0.12° / 0.20°
- Swing at teleaz / el, peak to peak
- 0.53° / 1.23°
- Pan reversalsper 10 s at tele
- 0.4
- Largest pan hopin any 1 s at tele
- 1.37°
- Largest tilt hopin any 1 s at tele
- 1.00°
- Pose error, mediancommand vs camera
- 0.69°
- Largest correctionvision vs prediction
- 0.63°
- Zoom steps
- 13
Aircraft & route
- Flight
- UAL927
- Registration
- N29985
- Type
- Boeing 787 9
- Airline
- United
- From
- FRA · Frankfurt am Main
- To
- SFO · San Francisco
- Ground speed
- 257 kt
- Altitude at closest
- 10,525 ft
- Vertical rate
- —
- Category
- A5
- ICAO hex
- a31a77
Pass geometry
- Max elevation
- 24.8°
- Elevation at start → end
- 24.7° → 20.7°
- Azimuth at start → end
- 13° NNE → 47° NE
- Closest-approach azimuth
- 16° NNE
- Minimum slant range
- 7.6 km
- Heading at closest
- 111° ESE
- Aspect at closest
- side-on (85°)
- Turn
- straight (0°)
- Departure
- No
- Zenith pass
- No
- Dead-zone wrap
- No
- Duration
- 0:34 (34.2 s)
- Lock
- 87%
Build & tuning
The tracker build that flew this pass and the live settings that mattered, so passes can be compared across changes.
- Build
- 2026-10-14n — vision skyline mask 31x cheaper (loop back to ~15 Hz)
- Commit
- af2a83e
- Node
- v22.22.2
- Camera
- TONGVEO 20x PTZ · 1920×1080 @ 30 fps
- Clip
- 17.0 MB · 34.0 s · offset -0.8 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
- -0.16
- 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