skylight.

UAL2649 United

Airbus A319 131 · N822UA · SFO → ?

· 1:15Quality 78side-onDead-zone wrap

3D replay

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 —
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
69%
First lockfrom target selected
5.4 s
Centring, medianaz / el while locked
0.87° / 0.70°
Centring, 90th pctaz / el while locked
4.43° / 4.30°
Tightest field of viewhorizontal
3.4°
Time to 8°from first lock
9.9 s
Time to tightestfrom first lock
67.6 s
Time at telefield of view ≤ 5.5°
7.7 s
Jitter at teleaz / el, standard deviation
0.08° / 0.16°
Swing at teleaz / el, peak to peak
0.28° / 0.57°
Pan reversalsper 10 s at tele
1.3
Largest pan hopin any 1 s at tele
1.58°
Largest tilt hopin any 1 s at tele
1.41°
Pose error, mediancommand vs camera
2.02°
Largest correctionvision vs prediction
2.54°
Zoom steps
50

Aircraft & route

Flight
UAL2649
Registration
N822UA
Type
Airbus A319 131
Airline
United
From
SFO
To
—
Ground speed
292 kt
Altitude at closest
6,675 ft
Vertical rate
+3,712 ft/min
Category
A3
ICAO hex
ab3a0c

Pass geometry

Max elevation
65.7°
Elevation at start → end
19.9° → 24.0°
Azimuth at start → end
2° N → 202° SSW
Closest-approach azimuth
280° W
Minimum slant range
2.2 km
Heading at closest
194° SSW
Aspect at closest
side-on (86°)
Turn
straight (2°)
Departure
Yes — climbing out after take-off
Zenith pass
No
Dead-zone wrap
Yes — pan pre-positioned across the stop
Duration
1:15 (74.9 s)
Lock
69%

Build & tuning

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

Build
2026-10-14b — steady overhead park, zoom travel guard
Commit
181d1fa+wip
Node
v22.22.2
Camera
TONGVEO 20x PTZ · 1920×1080 @ 30 fps
Clip
37.5 MB · 75.0 s · offset -1.3 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