Scenario28

HST V3 Trajectory 28

WSE approach around an articulated nadir-pointing target, LEO

Walking safety ellipse (WSE) approachLEO1000 frames5 s/frame90° FoVarticulatedstereo

Trajectory card & sample video

trajectory_28_card.png · HST_DatasetV3_28_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, LEO. Start range 47 m · end range 0 m · radial amplitude 5 m · cross-track amplitude 25 m · initial phase -1.5708 rad · cross-track phase 1.5708 rad · approach axis Zenith · unsafe phasing false. Starts at 2025-04-22T07:23:00 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 · 20.5 MB

Configuration

Target orbit

Regime
LEO
NORAD ID
20580

Keplerian elements

Semi-major axis a (derived)
6869.8 km
Eccentricity e
0.0001952
Inclination i
28.4697°
RAAN Ω
18.8626°
Argument of perigee ω
270.3861°
Mean anomaly M
89.6509°

Mean motion & derived

Mean motion
15.24721539 rev/day
Orbital period
94.44 min
Mean altitude
491.6 km
// target two-line element set
1 20580U 90037B   25118.90038554  .00010015  00000-0  38476-3 0  9993
2 20580  28.4697  18.8626 0001952 270.3861  89.6509 15.24721539725154

Target spacecraft

Attitude mode
Nadir-pointing
Attitude hold
Controlled

Articulation

Solar-panel Sun tracking
not enabled
TDRS antenna tracking
enabled
PV3_Antenna (frames 46–98)
0° → -90°
NV3_Antenna (frames 46–98)
0° → 90°
ApertureDoor (frames 277–338)
-112° → 0°

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
47 m
End range
0 m
Radial amplitude
5 m
Cross-track amplitude
25 m
Initial phase
-1.5707963267948966 rad
Cross-track phase
1.5707963267948966 rad
Terminal approach axis
Zenith
Allow unsafe phasing
false
Random seed
28

Timing

Start epoch (UTC)
2025-04-22T07:23:00.0000000Z
Frames
1000
Time step
5 s
Duration
5000 s
Duration (clock)
1 h 23 min 20 s
Orbits covered (derived)
0.88

Illumination

Class
sweeps through the run
Sun optical-axis angle
15° – 165°
Spotlight
Auto
// 180° = Sun directly behind the camera (target fully lit)
// ~165° = low phase angle · ~95° = high phase angle