skylight.

UAL626 United

Airbus A320 232 · N493UA · SFO → ?

· 1:31Quality 92nose/tail

3D replay

Software-steadied: the hops of the camera motor are smoothed out (plane wobble −73%). Download

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
89%
First lockfrom target selected
5.6 s
Centring, medianaz / el while locked
0.14° / 0.18°
Centring, 90th pctaz / el while locked
1.80° / 1.19°
Tightest field of viewhorizontal
3.4°
Time to 8°from first lock
3.4 s
Time to tightestfrom first lock
67.5 s
Time at telefield of view ≤ 5.5°
53.0 s
Jitter at teleaz / el, standard deviation
0.35° / 0.28°
Swing at teleaz / el, peak to peak
2.14° / 2.71°
Pan reversalsper 10 s at tele
0.9
Largest pan hopin any 1 s at tele
5.05°
Largest tilt hopin any 1 s at tele
10.00°
Pose error, mediancommand vs camera
0.57°
Largest correctionvision vs prediction
1.94°
Zoom steps
33

Aircraft & route

Flight
UAL626
Registration
N493UA
Type
Airbus A320 232
Airline
United
From
SFO
To
—
Ground speed
246 kt
Altitude at closest
4,750 ft
Vertical rate
+1,152 ft/min
Category
A3
ICAO hex
a61d00

Pass geometry

Max elevation
83.1°
Elevation at start → end
17.2° → 16.2°
Azimuth at start → end
15° NNE → 200° SSW
Closest-approach azimuth
289° WNW
Minimum slant range
1.5 km
Heading at closest
198° SSW
Aspect at closest
nose/tail (15°)
Turn
straight (0°)
Departure
Yes — climbing out after take-off
Zenith pass
No
Dead-zone wrap
No
Duration
1:31 (90.7 s)
Lock
89%

Build & tuning

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

Build
2026-10-16d — interleaved A/B (experiment mountPrior)
Commit
221ec3f
Node
v22.22.2
Camera
TONGVEO 20x PTZ · 1920×1080 @ 30 fps
Clip
77.8 MB · 91.0 s · offset -1.7 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
-0.1
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