skylight.

UAL2649 United

Airbus A319 131 · N837UA · SFO → ?

· 1:16Quality 70low zoomside-onturned left 34°Dead-zone wrap

3D replay

Software-steadied: the hops of the camera motor are smoothed out (plane wobble −34%). 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
76%
First lockfrom target selected
5.2 s
Centring, medianaz / el while locked
0.47° / 0.58°
Centring, 90th pctaz / el while locked
2.21° / 1.73°
Tightest field of viewhorizontal
10.8°
Time to 8°from first lock
—
Time to tightestfrom first lock
0.0 s
Time at telefield of view ≤ 5.5°
0.0 s
Jitter at teleaz / el, standard deviation
—
Swing at teleaz / el, peak to peak
—
Pan reversalsper 10 s at tele
—
Largest pan hopin any 1 s at tele
—
Largest tilt hopin any 1 s at tele
—
Pose error, mediancommand vs camera
1.67°
Largest correctionvision vs prediction
1.21°
Zoom steps
0

Aircraft & route

Flight
UAL2649
Registration
N837UA
Type
Airbus A319 131
Airline
United
From
SFO
To
—
Ground speed
312 kt
Altitude at closest
8,125 ft
Vertical rate
+4,928 ft/min
Category
A3
ICAO hex
ab741e

Pass geometry

Max elevation
55.8°
Elevation at start → end
19.5° → 24.1°
Azimuth at start → end
349° N → 205° SSW
Closest-approach azimuth
274° W
Minimum slant range
3.0 km
Heading at closest
187° S
Aspect at closest
side-on (87°)
Turn
turned left 34°
Departure
Yes — climbing out after take-off
Zenith pass
No
Dead-zone wrap
Yes — pan pre-positioned across the stop
Duration
1:16 (75.8 s)
Lock
76%

Build & tuning

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

Build
2026-10-13f — log which rule set the zoom (zw)
Commit
181d1fa+wip
Node
v22.22.2
Camera
TONGVEO 20x PTZ · 1920×1080 @ 30 fps
Clip
38.0 MB · 76.0 s · offset -1.7 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