It therefore has an inclination of 90 degrees to the equator. A polar orbit is a low-Earth orbit in which the satellite crosses over both poles on each revolution. Lunar Prospector was the third mission selected by NASA for full development and construction as part of the Discovery Program. More technically, it is an orbit arranged so that it precesses through one complete revolution each year, so it always maintains the same relationship with the Sun. The lower the altitude of a satellite, more speed he needs to keep in orbit … For typical satellites in a polar circular orbit, the height is about 800 km, implying a period of about 100 min. An inclination of about 98 degrees is used to create a precession that makes the orbit sun synchronous, providing nearly constant local time sampling.
... the polar-orbiting satellites have a sweet spot that allows them to stay in one time. Polar orbit :- A polar orbit is one in which a satellite passes above or nearly above both poles of the body being orbited (usually a planet such as the Earth) on each revolution. By Steven Holzner . Purpose of use I am writing a sci-fi novel and am doing preliminary research on the altitude that a time mirror would have to orbit so that its antiproton beam will always point at … Each orbit lasts 12 hours, so the slow, high-altitude portion of the orbit repeats over the same location every day and night. A polar orbit means that the station orbits at an inclination of about 90 degrees North (or South). The altitude of a satellite in polar orbit is a compromise between different requirements: High ground resolution and a short orbital period for frequent coverage — these result from a low orbit. In space, gravity supplies the centripetal force that causes satellites (like the moon) to orbit larger bodies (like the Earth).

Advantages: high-resolution images, able to map the entire Earth with time Altitude: most common is … 1.1.3 Global Coverage with Polar Orbits. Thanks to physics, if you know the mass and altitude of a satellite in orbit around the Earth, you can calculate how quickly it needs to travel to maintain that orbit. The International Space Station, 350 km above the surface, completes its orbit in 90 minutes. LunaH-Map will enter a low altitude, elliptical polar orbit and will measure the abundance of hydrogen using a new type of compact neutron spectrometer. 11.5.1 CryoSat Orbit. Satellites in polar orbit, positioned at 800 km in altitude will take approximately 102 minutes to complete one revolution. A swath of observation that is wide enough so that successive orbital swaths overlap. Russian communications satellites and the Sirius radio satellites currently use this type of orbit. CryoSat operates from a near circular, near polar orbit with an average altitude of 717.2 km, and an eccentricity of 0.0014.

Neutron measurements made at low altitude over the lunar south pole will allow LunaH-Map to constrain the hydrogen within permanently shadowed regions at unprecedented spatial resolution.
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