skylight.

ASA1400 Alaska

Boeing 737NG 890/W · N536AS · SFO → AUS

· 1:48Quality 90side-onturned left 128°Dead-zone wrap

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
78%
First lockfrom target selected
5.7 s
Centring, medianaz / el while locked
0.53° / 0.48°
Centring, 90th pctaz / el while locked
2.64° / 1.90°
Tightest field of viewhorizontal
4.1°
Time to 8°from first lock
15.3 s
Time to tightestfrom first lock
19.6 s
Time at telefield of view ≤ 5.5°
19.9 s
Jitter at teleaz / el, standard deviation
0.53° / 0.24°
Swing at teleaz / el, peak to peak
3.02° / 1.29°
Pan reversalsper 10 s at tele
1.0
Largest pan hopin any 1 s at tele
3.28°
Largest tilt hopin any 1 s at tele
2.64°
Pose error, mediancommand vs camera
1.03°
Largest correctionvision vs prediction
4.27°
Zoom steps
68

Aircraft & route

Flight
ASA1400
Registration
N536AS
Type
Boeing 737NG 890/W
Airline
Alaska
From
SFO · San Francisco
To
AUS · Austin
Ground speed
385 kt
Altitude at closest
12,175 ft
Vertical rate
+4,864 ft/min
Category
A3
ICAO hex
a6c6c8

Pass geometry

Max elevation
61.7°
Elevation at start → end
20.0° → 31.6°
Azimuth at start → end
344° NNW → 124° SE
Closest-approach azimuth
211° SSW
Minimum slant range
4.2 km
Heading at closest
127° SE
Aspect at closest
side-on (84°)
Turn
turned left 128°
Departure
Yes — climbing out after take-off
Zenith pass
No
Dead-zone wrap
Yes — pan pre-positioned across the stop
Duration
1:48 (108.3 s)
Lock
78%

Build & tuning

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

Build
2026-10-13j — full 3.4 deg tele for slow planes (limit only above 0.5 deg/s)
Commit
181d1fa+wip
Node
v22.22.2
Camera
TONGVEO 20x PTZ · 1920×1080 @ 30 fps
Clip
54.0 MB · 108.0 s · offset -1.4 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