Scenario29

HST V3 Trajectory 29

WSE approach around an articulated nadir-pointing target, GEO

Walking safety ellipse (WSE) approachGEO2000 frames87.01570047246102 s/frame90° FoVarticulatedstereo

Trajectory card & sample video

trajectory_29_card.png · HST_DatasetV3_29_color.mp4
QuaternionRelative attitude of the target in the camera frame, per frame.
Target translationTarget position in the camera frame. tz is the range on the left axis (m); tx/ty use the right axis.
Optical-axis angleAngle from the chaser body front axis to the Sun, the Earth centre and the target — the annotation’s SunToCameraAngle, EarthToCameraAngle and TargetToCameraAngle. A flat 0° target trace means the chaser is pointed at the target.
Scene / illuminationBands along the bottom: eclipse or daylight, plus when the Earth and the Sun are inside the field of view.
TrajectoryWSE approach around an articulated nadir-pointing target, GEO. Start range -45 m · end range 0 m · radial amplitude 11 m · cross-track amplitude 20 m · initial phase 0 rad · cross-track phase 0 rad · approach axis Zenith · unsafe phasing false. Starts at 2025-12-03T23:21:00 UTC.
PlaybackCentre camera, colour post-process, every rendered frame in order — 2000 frames at 30 fps = 66.7 s · 1024×1024 · H.264 · no audio · 21.4 MB

Configuration

Target orbit

Regime
GEO
NORAD ID
26863

Keplerian elements

Semi-major axis a (derived)
42441.5 km
Eccentricity e
0.0016759
Inclination i
14.6193°
RAAN Ω
8.6383°
Argument of perigee ω
171.3313°
Mean anomaly M
15.0543°

Mean motion & derived

Mean motion
0.99292426 rev/day
Orbital period
1450.26 min
Mean altitude
36063.4 km
// target two-line element set
1 26863U 01029A   25244.26303748 -.00000262  00000-0  00000-0 0  9998
2 26863  14.6193   8.6383 0016759 171.3313  15.0543  0.99292426 40988

Target spacecraft

Attitude mode
Nadir-pointing
Attitude hold
Controlled

Articulation

Solar-panel Sun tracking
not enabled
TDRS antenna tracking
enabled
PV3_Antenna (frames 32–47)
0° → -90°
NV3_Antenna (frames 32–47)
0° → 90°

Camera & render

Behaviour
Continuous target tracking
Attitude mode
Triad (two-vector) pointing
Primary
BodyFront → Target
Secondary
BodyUp → Normal
Attitude hold
Controlled
Target angle
constant 0°

Optics & render

Horizontal field of view
90° (default)
fx = fy (derived)
512.00
cx = cy
512
Cameras
Center · Right
Resolution
1024×1024 px
Pixel samples
32
Camera axes
−Z forward · +X right · +Y down

Relative trajectory

Generator
Walking safety ellipse (WSE) approach
Step name
WalkingSafetyEllipseOrbitGenerator
Start range
-45 m
End range
0 m
Radial amplitude
11 m
Cross-track amplitude
20 m
Initial phase
0 rad
Cross-track phase
0 rad
Terminal approach axis
Zenith
Allow unsafe phasing
false
Random seed
29

Timing

Start epoch (UTC)
2025-12-03T23:21:00.0000000Z
Frames
2000
Time step
87.01570047246102 s
Duration
174031.4 s
Duration (clock)
48 h 20 min 31 s
Orbits covered (derived)
2.00

Illumination

Class
sweeps through the run
Sun optical-axis angle
45° – 178°
Spotlight
Auto
// 180° = Sun directly behind the camera (target fully lit)
// ~165° = low phase angle · ~95° = high phase angle