UAL2661 United
Boeing 737MAX 9 · N27509 · SFO → ?
· 1:40Quality 94side-onturned left 41°
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
- 9.3 s
- Centring, medianaz / el while locked
- 0.11° / 0.11°
- Centring, 90th pctaz / el while locked
- 0.45° / 0.26°
- Tightest field of viewhorizontal
- 4.1°
- Time to 8°from first lock
- 4.8 s
- Time to tightestfrom first lock
- 6.6 s
- Time at telefield of view ≤ 5.5°
- 78.4 s
- Jitter at teleaz / el, standard deviation
- 0.20° / 0.16°
- Swing at teleaz / el, peak to peak
- 1.37° / 0.99°
- Pan reversalsper 10 s at tele
- 0.0
- Largest pan hopin any 1 s at tele
- 3.21°
- Largest tilt hopin any 1 s at tele
- 1.59°
- Pose error, mediancommand vs camera
- 0.83°
- Largest correctionvision vs prediction
- 0.98°
- Zoom steps
- 37
Aircraft & route
- Flight
- UAL2661
- Registration
- N27509
- Type
- Boeing 737MAX 9
- Airline
- United
- From
- SFO
- To
- —
- Ground speed
- 294 kt
- Altitude at closest
- 7,925 ft
- Vertical rate
- +1,920 ft/min
- Category
- A3
- ICAO hex
- a2bb89
Pass geometry
- Max elevation
- 29.3°
- Elevation at start → end
- 18.8° → 19.5°
- Azimuth at start → end
- 329° NNW → 198° SSW
- Closest-approach azimuth
- 277° W
- Minimum slant range
- 4.9 km
- Heading at closest
- 195° SSW
- Aspect at closest
- side-on (82°)
- Turn
- turned left 41°
- Departure
- Yes — climbing out after take-off
- Zenith pass
- No
- Dead-zone wrap
- No
- Duration
- 1:40 (99.6 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
- 2026-10-15o — sun keep-out by the frame; no video, no pass
- Commit
- cb31ea0
- Node
- v22.22.2
- Camera
- TONGVEO 20x PTZ · 1920×1080 @ 30 fps
- Clip
- 49.9 MB · 100.0 s · offset -1.2 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