Scenario20

HST V3 Trajectory 20

NMC around an articulated nadir-pointing target with high angle illumination, LEO, uncontrolled camera

Natural-motion circumnavigation (NMC)LEO1000 frames6 s/frame90° FoVillum ~95°articulatedstereo

Trajectory card & sample video

trajectory_20_card.png · HST_DatasetV3_20_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 an articulated nadir-pointing target with high angle illumination, LEO, uncontrolled camera. Radial separation 33.5 m · along-track min 0 m · along-track max 0 m · initial phase 0 rad. Starts at 2025-08-01T17:57:00 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 · 15.3 MB

Configuration

Target orbit

Regime
LEO
NORAD ID
20580

Keplerian elements

Semi-major axis a (derived)
6866.7 km
Eccentricity e
0.0001723
Inclination i
28.4678°
RAAN Ω
100.6954°
Argument of perigee ω
223.6882°
Mean anomaly M
136.3576°

Mean motion & derived

Mean motion
15.25737045 rev/day
Orbital period
94.38 min
Mean altitude
488.6 km
// target two-line element set
1 20580U 90037B   25213.05470067  .00006847  00000-0  25257-3 0  9995
2 20580  28.4678 100.6954 0001723 223.6882 136.3576 15.25737045739549

Target spacecraft

Attitude mode
Nadir-pointing
Attitude hold
Controlled

Articulation

Solar-panel Sun tracking
not enabled
TDRS antenna tracking
enabled
PV3_Antenna (frames 50–94)
0° → -90°
NV3_Antenna (frames 50–94)
0° → 90°
ApertureDoor (frames 145–189)
-112° → 0°
ApertureDoor (frames 780–824)
0° → -112°

Camera & render

Behaviour
Attitude solved once and then held — target drifts through the field of view
Attitude mode
Triad (two-vector) pointing
Primary
BodyFront → Target
Secondary
BodyUp → Normal
Attitude hold
Uncontrolled
Target angle
oscillates 0–20°

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
33.5 m
Min along-track offset
0 m
Max along-track offset
0 m
Initial phase
0 rad
Random seed
20

Timing

Start epoch (UTC)
2025-08-01T17:57:00.0000000Z
Frames
1000
Time step
6 s
Duration
6000 s
Duration (clock)
1 h 40 min 0 s
Orbits covered (derived)
1.06

Illumination

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