UAL1561 United
Boeing 737NG 924ER/W · N75435 · SFO → PDX
· 1:27Quality 88side-onturned left 58°Dead-zone wrap
Software-steadied: the hops of the camera motor are smoothed out (plane wobble −61%). 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
- 81%
- First lockfrom target selected
- 8.8 s
- Centring, medianaz / el while locked
- 0.41° / 0.27°
- Centring, 90th pctaz / el while locked
- 3.29° / 1.11°
- Tightest field of viewhorizontal
- 3.4°
- Time to 8°from first lock
- 7.1 s
- Time to tightestfrom first lock
- 68.6 s
- Time at telefield of view ≤ 5.5°
- 16.3 s
- Jitter at teleaz / el, standard deviation
- 0.24° / 0.42°
- Swing at teleaz / el, peak to peak
- 0.95° / 1.75°
- Pan reversalsper 10 s at tele
- 1.2
- Largest pan hopin any 1 s at tele
- 3.25°
- Largest tilt hopin any 1 s at tele
- 3.79°
- Pose error, mediancommand vs camera
- 1.20°
- Largest correctionvision vs prediction
- 0.90°
- Zoom steps
- 54
Aircraft & route
- Flight
- UAL1561
- Registration
- N75435
- Type
- Boeing 737NG 924ER/W
- Airline
- United
- From
- SFO · San Francisco
- To
- PDX · Portland
- Ground speed
- 299 kt
- Altitude at closest
- 8,425 ft
- Vertical rate
- +3,968 ft/min
- Category
- A3
- ICAO hex
- aa2bc4
Pass geometry
- Max elevation
- 43.9°
- Elevation at start → end
- 18.9° → 19.8°
- Azimuth at start → end
- 332° NNW → 203° SSW
- Closest-approach azimuth
- 254° WSW
- Minimum slant range
- 3.7 km
- Heading at closest
- 173° S
- Aspect at closest
- side-on (81°)
- Turn
- turned left 58°
- Departure
- Yes — climbing out after take-off
- Zenith pass
- No
- Dead-zone wrap
- Yes — pan pre-positioned across the stop
- Duration
- 1:27 (86.8 s)
- Lock
- 81%
Build & tuning
The tracker build that flew this pass and the live settings that mattered, so passes can be compared across changes.
- Build
- 2026-10-13j — full 3.4 deg tele for slow planes (limit only above 0.5 deg/s)
- Commit
- 181d1fa+wip
- Node
- v22.22.2
- Camera
- TONGVEO 20x PTZ · 1920×1080 @ 30 fps
- Clip
- 43.4 MB · 87.0 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