Scenario27

HST V3 Trajectory 27

WSE approach around an articulated retrograde-pointing target, GEO, approach-axis camera

Walking safety ellipse (WSE) approachGEO1000 frames87.01570047246102 s/frame90° FoVarticulatedstereo

Trajectory card & sample video

trajectory_27_card.png · HST_DatasetV3_27_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 retrograde-pointing target, GEO, approach-axis camera. Start range 45.9104 m · end range 10.3588 m · radial amplitude 3.49301 m · cross-track amplitude 12.6016 m · initial phase -1.5708 rad · cross-track phase 0 rad · unsafe phasing false. Starts at 2025-09-08T17:24:00 UTC.
PlaybackCentre camera, colour post-process, every rendered frame in order — 1000 frames at 30 fps = 33.3 s · 1024×1024 · H.264 · no audio · 14.2 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
Retrograde (anti-velocity) pointing
Attitude hold
Controlled

Articulation

Solar-panel Sun tracking
not enabled
TDRS antenna tracking
enabled
PV3_Antenna (frames 66–114)
0° → -90°
NV3_Antenna (frames 66–114)
0° → 90°
ApertureDoor (frames 84–126)
0° → -112°
ApertureDoor (frames 632–674)
-112° → 0°

Camera & render

Behaviour
Body-fixed to the approach (anti-velocity) axis
Attitude mode
Retrograde (anti-velocity) pointing
Attitude hold
Controlled
Target angle
rises 0–45°

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
45.910371063159836 m
End range
10.358766525806374 m
Radial amplitude
3.49300515920824 m
Cross-track amplitude
12.601630579117217 m
Initial phase
-1.5707963267948966 rad
Cross-track phase
0 rad
Allow unsafe phasing
false
Random seed
27

Timing

Start epoch (UTC)
2025-09-08T17:24:00.0000000Z
Frames
1000
Time step
87.01570047246102 s
Duration
87015.7 s
Duration (clock)
24 h 10 min 16 s
Orbits covered (derived)
1.00

Illumination

Class
sweeps through the run
Sun optical-axis angle
0° – 180°
Spotlight
Auto
// 180° = Sun directly behind the camera (target fully lit)
// ~165° = low phase angle · ~95° = high phase angle