polar orbiting satellite
mâhvâré bâ madâr-e qotbi
Fr.: satellite en orbite polaire
A satellite that revolves around the Earth in an almost north-south orbit, passing close to both poles. The orbits are sun synchronous, allowing the satellite to cross the equator at the same local time each day. These satellites orbit at a height of 830-880 km and take about 100 minutes to complete a turn around the Earth.
Fr.: orbite prograde
Same as →prograde motion.
Fr.: orbite de résonance
An orbit which is in → orbital resonance with another orbit.
Fr.: orbite rétrograde
An orbit with an inclination between 90° and 270° such as those of some comets and small asteroids orbiting the Sun.
jafsari-ye espin-madâr, jofteš-e ~
Fr.: couplage spin-orbite
1) Astro.: A relationship between the orbital period of one body around another
and its rotational period on its axis. The relationship results from tidal forces
between the two bodies. For example, the rotation period of the Moon equals its revolution
period around the Earth.
Fr.: orbite stationnaire
An orbit in which the satellite revolves about the primary at the angular rate at which the primary rotates on its axis. From the primary, the satellite thus appears to be stationary over a point on the primary.
Fr.: orbite synchrone
Fr.: orbite en forme de têtard