skylight.

SWA1275 Southwest Airlines

Boeing 737NG 800/W · N8517F · SFO → ?

· 0:17Quality 50soft focuslost lockside-onturned left 18°

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
20%
First lockfrom target selected
12.6 s
Centring, medianaz / el while locked
2.34° / 0.46°
Centring, 90th pctaz / el while locked
2.87° / 0.56°
Tightest field of viewhorizontal
4.1°
Time to 8°from first lock
2.6 s
Time to tightestfrom first lock
—
Time at telefield of view ≤ 5.5°
2.0 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
3.42°
Largest correctionvision vs prediction
0.18°
Zoom steps
37

Aircraft & route

Flight
SWA1275
Registration
N8517F
Type
Boeing 737NG 800/W
Airline
Southwest Airlines
From
SFO
To
—
Ground speed
295 kt
Altitude at closest
7,725 ft
Vertical rate
+3,712 ft/min
Category
A3
ICAO hex
abae62

Pass geometry

Max elevation
19.2°
Elevation at start → end
16.1° → 19.2°
Azimuth at start → end
313° NW → 293° WNW
Closest-approach azimuth
293° WNW
Minimum slant range
7.2 km
Heading at closest
196° SSW
Aspect at closest
side-on (83°)
Turn
turned left 18°
Departure
Yes — climbing out after take-off
Zenith pass
No
Dead-zone wrap
No
Duration
0:17 (16.6 s)
Lock
20%

Build & tuning

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

Build
2026-10-14n — vision skyline mask 31x cheaper (loop back to ~15 Hz)
Commit
af2a83e
Node
v22.22.2
Camera
TONGVEO 20x PTZ · 1920×1080 @ 30 fps
Clip
7.5 MB · 17.0 s · offset -1.6 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
-0.16
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