ORBITAL DYNAMICS LAB

J2 Orbit Explorer

Watch Earth’s oblateness turn the orbital plane.

60 simulated seconds / second
EARTH-CENTERED INERTIAL VIEW

Right ascension of the ascending node

Numerical / osculating · First-order secular estimate

Initial orbit and integration settings

Altitude means semimajor axis minus Earth radius. Angles are in degrees; these are initial osculating elements.

Blue: current ellipse · gray: initial ellipse · gold: recent path · red: spacecraft · purple: ascending node

Drag to rotate · scroll to zoom. Earth rotates at the sidereal rate; its initial Greenwich orientation is illustrative. Numerical two-body + J2 model, with no drag or thrust. RAAN auto-scales; a wrap crossing expands the range.