skylight.

LXJ221 Flexjet

N221FX

· 0:47Quality 87lost locknose/tail

3D replay

Software-steadied: the hops of the camera motor are smoothed out (plane wobble −78%). 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
65%
First lockfrom target selected
9.4 s
Centring, medianaz / el while locked
0.27° / 0.37°
Centring, 90th pctaz / el while locked
0.82° / 3.23°
Tightest field of viewhorizontal
3.4°
Time to 8°from first lock
6.7 s
Time to tightestfrom first lock
25.6 s
Time at telefield of view ≤ 5.5°
25.6 s
Jitter at teleaz / el, standard deviation
0.27° / 0.29°
Swing at teleaz / el, peak to peak
0.98° / 1.01°
Pan reversalsper 10 s at tele
4.7
Largest pan hopin any 1 s at tele
1.09°
Largest tilt hopin any 1 s at tele
2.48°
Pose error, mediancommand vs camera
0.41°
Largest correctionvision vs prediction
3.43°
Zoom steps
39

Aircraft & route

Flight
LXJ221
Registration
N221FX
Type
—
Airline
Flexjet
From
—
To
—
Ground speed
201 kt
Altitude at closest
1,250 ft
Vertical rate
—
Category
A2
ICAO hex
a1e54b

Pass geometry

Max elevation
88.7°
Elevation at start → end
32.4° → 13.5°
Azimuth at start → end
115° ESE → 297° WNW
Closest-approach azimuth
183° S
Minimum slant range
363 m
Heading at closest
295° WNW
Aspect at closest
nose/tail (1°)
Turn
straight (2°)
Departure
Yes — climbing out after take-off
Zenith pass
No
Dead-zone wrap
No
Duration
0:47 (47.1 s)
Lock
65%

Build & tuning

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

Build
2026-10-15o — sun keep-out by the frame; no video, no pass
Commit
cb31ea0
Node
v22.22.2
Camera
TONGVEO 20x PTZ · 1920×1080 @ 30 fps
Clip
23.5 MB · 47.0 s · offset -1.2 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