skylight.

SWA3399 Southwest Airlines

Boeing 737 MAX 8 · N8985Q · SFO → ?

· 2:16Quality 70lost lockside-onturned left 47°

3D replay

Software-steadied: the hops of the camera motor are smoothed out (plane wobble −60%). 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
86%
First lockfrom target selected
4.6 s
Centring, medianaz / el while locked
0.11° / 0.09°
Centring, 90th pctaz / el while locked
0.27° / 0.35°
Tightest field of viewhorizontal
3.4°
Time to 8°from first lock
7.5 s
Time to tightestfrom first lock
24.9 s
Time at telefield of view ≤ 5.5°
120.8 s
Jitter at teleaz / el, standard deviation
0.19° / 0.16°
Swing at teleaz / el, peak to peak
2.57° / 1.45°
Pan reversalsper 10 s at tele
0.2
Largest pan hopin any 1 s at tele
7.43°
Largest tilt hopin any 1 s at tele
3.19°
Pose error, mediancommand vs camera
0.40°
Largest correctionvision vs prediction
1.63°
Zoom steps
41

Aircraft & route

Flight
SWA3399
Registration
N8985Q
Type
Boeing 737 MAX 8
Airline
Southwest Airlines
From
SFO
To
—
Ground speed
282 kt
Altitude at closest
7,425 ft
Vertical rate
+2,496 ft/min
Category
A3
ICAO hex
ac6622

Pass geometry

Max elevation
26.5°
Elevation at start → end
24.0° → 12.2°
Azimuth at start → end
290° WNW → 189° S
Closest-approach azimuth
264° W
Minimum slant range
5.0 km
Heading at closest
184° S
Aspect at closest
side-on (80°)
Turn
turned left 47°
Departure
Yes — climbing out after take-off
Zenith pass
No
Dead-zone wrap
No
Duration
2:16 (136.1 s)
Lock
86%

Build & tuning

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

Build
2026-10-16g — A/B lockFirst (mount prior on)
Commit
9bdc356
Node
v22.22.2
Camera
TONGVEO 20x PTZ · 1920×1080 @ 30 fps
Clip
68.5 MB · 137.0 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
-0.15
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