Equatorial Orbit

Equatorial Orbit Define
Equatorial Orbit

An equatorial orbit is an orbit which is roughly in line with the equator of the planet being orbited. It is contrasted to a polar orbit in which the orbit passed over the north and south poles of the plant being orbited. Spacecraft being launched into an equatorial orbit are. The graph below shows the annual dose from protons, electrons and bremsstrahlung as a function of equatorial orbit altitude. Drolshagen, and H.D.R. Evans, ' Space Environment Analysis: Experience and Trends,' ESA 1996 Symposium on Environment Modelling for Space-based Applications, Sept. 18-20, 1996, ESTEC. While more difficult to set up than an omni-based network, a keosynchronous equatorial orbit (KEO) requires less precise satellite positioning, because its longer orbital period means satellites take longer to drift out of formation.

By far the most useful orbit for communication satellites is the geostationary satellite orbit. This is a direct equatorial orbit about 35800km above the ground, the period of which is the same as the length of the sidereal day, about 23 hours 56 minutes. A satellite in this orbit, moving in the same direction as the Earth's rotation, remains stationary as seen from points on the Earth's surface.

Polar orbit

A polar orbit is one in which a satellitepasses above or nearly above both poles of the body being orbited (usually a planet such as the Earth, but possibly another body such as the Moon or Sun) on each revolution. It has an inclination of about 60 - 90 degrees to the body's equator.^[1] A satellite in a polar orbit will pass over the equator at a different longitude on each of its orbits.

Launching satellites into polar orbit requires a larger launch vehicle to launch a given payload to a given altitude than for a near-equatorial orbit at the same altitude, due to the fact that much less of the Earth's rotationalvelocity can be taken advantage of to achieve orbit. Depending on the location of the launch site and the inclination of the polar orbit, the launch vehicle may lose up to 460 m/s of Delta-v, approximately 5% of the Delta-v required to attain Low Earth orbit. Polar orbits are a subtype of Low Earth orbits with altitudes between 200 and 1,000 kilometers.^[1]

Usage[edit]

Polar orbits are often used for Earth-mapping, Earth observation, capturing the Earth as time passes from one point, reconnaissance satellites, as well as for some weather satellites.^[2]The Iridium satellite constellation also uses a polar orbit to provide telecommunications services. This differs from a geosynchronous orbit in which one spot on the Earth's surface can be sensed continuously from a satellite.

Sun-synchronous orbits[edit]

Near-polar orbiting satellites commonly choose a Sun-synchronous orbit, meaning that each successive orbital pass occurs at the same local time of day. This can be particularly important for applications such as remote sensing atmospheric temperature,where the most important thing to see may well be changes over time which are not aliased onto changes in local time. To keep the same local time on a given pass, the time period of the orbit must be kept as short as possible, this is achieved by keeping the orbit lower around Earth. However, very low orbits of a few hundred kilometers rapidly decay due to drag from the atmosphere. Commonly used altitudes are between 700 and 800 km, producing an orbital period of about 100 minutes.^[3] The half-orbit on the Sun side then takes only 50 minutes, during which local time of day does not vary greatly.

To retain the Sun-synchronous orbit as Earth revolves around the Sun during the year, the orbit of the satellite must precess at the same rate, which is not possible if the satellite were to pass directly over the pole.Because of Earth's equatorial bulge, an orbit inclined at a slight angle is subject to a torque, which causes precession. An angle of about 8° from the pole produces the desired precession in a 100-minute orbit.^[3]

References[edit]

^ ^a^b'ESA - Types of Orbits'. 2020-03-30. Retrieved 2021-01-10.
^Science Focus 2nd Edition 2, pg. 297
^ ^a^bStern, David P. (2001-11-25). 'Polar Orbiting Satellites'. Retrieved 2009-01-21.

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