skylight.

N66978

Cessna 172P · N66978 · UKI → SFO

· 1:03Quality 90clip shortnose/tailturned right 33°

3D replay

Software-steadied: the hops of the camera motor are smoothed out (plane wobble −67%). 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
89%
First lockfrom target selected
3.9 s
Centring, medianaz / el while locked
0.32° / 0.42°
Centring, 90th pctaz / el while locked
1.92° / 1.99°
Tightest field of viewhorizontal
4.1°
Time to 8°from first lock
3.3 s
Time to tightestfrom first lock
5.3 s
Time at telefield of view ≤ 5.5°
30.7 s
Jitter at teleaz / el, standard deviation
0.64° / 0.42°
Swing at teleaz / el, peak to peak
2.56° / 1.69°
Pan reversalsper 10 s at tele
0.7
Largest pan hopin any 1 s at tele
5.44°
Largest tilt hopin any 1 s at tele
4.27°
Pose error, mediancommand vs camera
1.22°
Largest correctionvision vs prediction
3.89°
Zoom steps
56

Aircraft & route

Flight
N66978
Registration
N66978
Type
Cessna 172P
Airline
—
From
UKI · Ukiah
To
SFO · Portland
Ground speed
102 kt
Altitude at closest
1,950 ft
Vertical rate
0 ft/min
Category
A1
ICAO hex
a8d916

Pass geometry

Max elevation
84.5°
Elevation at start → end
22.8° → 16.0°
Azimuth at start → end
175° S → 5° N
Closest-approach azimuth
266° W
Minimum slant range
615 m
Heading at closest
358° N
Aspect at closest
nose/tail (15°)
Turn
turned right 33°
Departure
No
Zenith pass
No
Dead-zone wrap
No
Duration
1:03 (63.0 s)
Lock
89%

Build & tuning

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

Build
2026-10-16e — A/B mountPrior + candidate diagnostics
Commit
ffe4b92
Node
v22.22.2
Camera
TONGVEO 20x PTZ · 1920×1080 @ 30 fps
Clip
33.3 MB · 32.4 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
-0.1
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