Orbit

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High Earth orbit - Highly Elliptical Orbit (HEO) (often referred to as the Molniya orbit, after the former Soviet communications satellite network which used such an orbit) is a satellite orbit characterized by a relatively low-altitude perigee and an extremely high-altitude apogee. This extremely elongated orbit has the advantage of long dwell times (often exceeding twelve hours of dwell with a one-hour perigee phase) during the approach and descent from apogee while offering visibility over the polar regions, which most geosynchronous satellites ...

Intermediate circular orbit - Intermediate circular orbit (ICO), also called medium earth orbit (MEO), is used by satellites between the altitudes of low earth orbit (up to 1400 km) and geosynchronous orbit (35,790 km).

Geosynchronous orbit - A geosynchronous orbit is a geocentric orbit that has the same orbital period as the sidereal rotation period of the Earth. It has a semi-major axis of 42,164 km orbit]s exist around all moons, planets, stars and black holes —unless they rotate so slowly that the orbit would be outside their Hill sphere.

Escape orbit - An escape orbit (also known as C3 = 0 orbit) is the high-energy parabolic orbit around the central body. A body in this orbit has at each position the escape velocity with respect to this central body, for this position.

Suggested Web Sites

Lunar Orbiter Program - Overviews of the various Lunar Orbiter missions, with photographs and related links.

Lunar Orbiter Photographic Atlas of the Moon - Digital edition of Lunar Orbiter Photographic Atlas, 1971, with all 675 plates.

GPS Precise Orbits - Global Positioning System satellite ephemerides ("orbits") information for the general public, from US NOAA. GPS precise orbits are derived using 24 hour data segments from the global GPS network. An informational summary file is provided to document the computation and to convey relevant information about the observed satellites, such as maneuvers or maintenance. Orbits generally are available 2 to 6 days after the observation.

Source: BazSites.com

Web Links

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Astronaut Earth Nasa Orbit Photograph -   Astronaut Earth Nasa Orbit Photograph Orbit: NASA Astronauts Photograph the Earth by Jay Apt, Photographs taken from space capture the natural forces that ...