Scenario21

HST V3 Trajectory 21

NMC around a rigid body nadir-pointing target with direct head-on illumination, GEO

Natural-motion circumnavigation (NMC)GEO1000 frames86.4 s/frame90° FoVillum 180°rigid bodystereo

Trajectory card & sample video

trajectory_21_card.png · HST_DatasetV3_21_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.
TrajectoryNMC around a rigid body nadir-pointing target with direct head-on illumination, GEO. Radial separation 27 m · along-track min 0 m · along-track max 0 m · initial phase 0 rad. Starts at 2025-09-02T10:13:00 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 · 11.6 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
not enabled
Appendage motion
none — rigid body

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
Natural-motion circumnavigation (NMC)
Step name
NaturalMotionCircnavOrbitGenerator
Max radial separation
27 m
Min along-track offset
0 m
Max along-track offset
0 m
Initial phase
0 rad
Random seed
21

Timing

Start epoch (UTC)
2025-09-02T10:13:00.0000000Z
Frames
1000
Time step
86.4 s
Duration
86400 s
Duration (clock)
24 h 0 min 0 s
Orbits covered (derived)
0.99

Illumination

Class
180°
Sun optical-axis angle
158° – 180°
Spotlight
Auto
// 180° = Sun directly behind the camera (target fully lit)
// ~165° = low phase angle · ~95° = high phase angle