skylight.

N9627H

Cessna 172M · N9627H · RHV → RHV

· 1:45Quality 82lost lockside-on

3D replay

Software-steadied: the hops of the camera motor are smoothed out (plane wobble −66%). 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
72%
First lockfrom target selected
11.7 s
Centring, medianaz / el while locked
0.14° / 0.17°
Centring, 90th pctaz / el while locked
0.70° / 0.62°
Tightest field of viewhorizontal
4.1°
Time to 8°from first lock
6.0 s
Time to tightestfrom first lock
7.8 s
Time at telefield of view ≤ 5.5°
58.3 s
Jitter at teleaz / el, standard deviation
0.26° / 0.28°
Swing at teleaz / el, peak to peak
2.26° / 2.23°
Pan reversalsper 10 s at tele
0.0
Largest pan hopin any 1 s at tele
3.51°
Largest tilt hopin any 1 s at tele
2.74°
Pose error, mediancommand vs camera
1.47°
Largest correctionvision vs prediction
1.08°
Zoom steps
41

Aircraft & route

Flight
N9627H
Registration
N9627H
Type
Cessna 172M (C172)
Airline
—
From
RHV · San Jose
To
RHV · San Jose
Ground speed
93 kt
Altitude at closest
1,925 ft
Vertical rate
+64 ft/min
Category
A1
ICAO hex
ad66e9

Pass geometry

Max elevation
39.2°
Elevation at start → end
12.4° → 15.4°
Azimuth at start → end
183° S → 333° NNW
Closest-approach azimuth
259° WSW
Minimum slant range
955 m
Heading at closest
348° NNW
Aspect at closest
side-on (89°)
Turn
straight (11°)
Departure
No
Zenith pass
No
Dead-zone wrap
No
Duration
1:45 (104.6 s)
Lock
72%

Build & tuning

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

Build
2026-10-15t — vertical rate falls back to geom_rate (server)
Commit
218644c
Node
v22.22.2
Camera
TONGVEO 20x PTZ · 1920×1080 @ 30 fps
Clip
51.3 MB · 104.3 s · offset -1.4 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
-0.03
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