skylight.

UAL1175 United

Boeing 777 300ER · N2136U · SFO → HNL

· 0:11Quality 40shortquartering

3D replay

Trace

Where the aircraft sat in the frame, second by second. Click the chart to jump the video there.

—FOV —az —el —pose —
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
62%
First lockfrom target selected
4.2 s
Centring, medianaz / el while locked
0.48° / 0.12°
Centring, 90th pctaz / el while locked
1.32° / 0.20°
Tightest field of viewhorizontal
4.1°
Time to 8°from first lock
6.4 s
Time to tightestfrom first lock
—
Time at telefield of view ≤ 5.5°
1.1 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
—
Largest tilt hopin any 1 s at tele
—
Pose error, mediancommand vs camera
0.89°
Largest correctionvision vs prediction
0.17°
Zoom steps
11

Aircraft & route

Flight
UAL1175
Registration
N2136U
Type
Boeing 777 300ER
Airline
United
From
SFO · San Francisco
To
HNL · Honolulu
Ground speed
279 kt
Altitude at closest
8,000 ft
Vertical rate
+3,008 ft/min
Category
A5
ICAO hex
a1c7e4

Pass geometry

Max elevation
16.6°
Elevation at start → end
16.6° → 15.3°
Azimuth at start → end
291° WNW → 285° WNW
Closest-approach azimuth
291° WNW
Minimum slant range
8.7 km
Heading at closest
252° WSW
Aspect at closest
quartering (39°)
Turn
straight (0°)
Departure
Yes — climbing out after take-off
Zenith pass
No
Dead-zone wrap
No
Duration
0:11 (10.9 s)
Lock
62%

Build & tuning

The tracker build that flew this pass and the live settings that mattered, so passes can be compared across changes.

Build
2026-10-13a — zoom ladder waits for the lens to settle before demoting
Commit
181d1fa+wip
Node
v22.22.2
Camera
TONGVEO 20x PTZ · 1920×1080 @ 30 fps
Clip
5.5 MB · 11.0 s · offset -1.0 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