Geostationary ring

Geostationary ring

The geostationary ring is a volume segment around the geostationary orbit defined by variations in altitude and declination that can occur for uncontrolled objects left in the geostationary orbit.

The geostationary orbit is subject to orbit perturbations caused by anomalies in the gravitational field of the Earth, by the gravitational effects of Sun and Moon, and by solar radiation pressure.

A precessional motion of the orbit plane is caused by the oblatedness of the Earth (J_2), and the gravitational effects of Sun and Moon. This motion has a period of about 53 years. The two parameters describing the direction of the orbit plane in space, the right ascension of the ascending node, and the inclination are affected by this precession. The maximum inclination reached during the 53-year cycle is about 15 degrees. Therefore, the definition of the geostationary ring foresees a declination range from -15 degrees to +15 degrees.

On the other hand, solar radiation pressure induces an eccentricity that leads to a variation of the orbit radius by ± 75 kilometers in some cases.

This leads to the definition of the geostationary ring as being a segment of space around the geostationary orbit that ranges from 75 km below GEO to 75 km above GEO and from -15 degrees to 15 degrees declination.

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Geostationary transfer orbit — A Geosynchronous Transfer Orbit or Geostationary Transfer Orbit (GTO) is a Hohmann transfer orbit around the Earth between a low Earth orbit (LEO) and a geosynchronous orbit (GEO). It is an ellipse where the perigee is a point on a LEO and the… …   Wikipedia

  • Geostationary orbit — Geostationary orbit.To an observer on the rotating Earth (fixed point on the Earth), the satellite appears stationary in the sky. A red satellite is also geostationary above its own point on Earth. Top Down View …   Wikipedia

  • Orbital ring — An Orbital Ring is a concept for a space elevator that consists of a ring in low earth orbit that rotates at above orbital speed, that has fixed tethers hanging down to the ground. The structure is intended to be used for space launch. The… …   Wikipedia

  • European Geostationary Navigation Overlay Service — (EGNOS) ist ein europäisches Differential Global Positioning System (DGPS) als Erweiterungssystem zur Satellitennavigation. Es steigert regional begrenzt auf Europa die Positionsgenauigkeit von GPS von 10 bis 20 Metern auf 1 bis 3 Meter und ist… …   Deutsch Wikipedia

  • ESA Space Debris Telescope — The ESA Space Debris Telescope is located at the Teide Observatory on the island of Tenerife, Spain. Actually, the telescope is ESA s Optical Ground Station forming a part of the Artemis experiment. As a large part of the observation time is… …   Wikipedia

  • Orbital Test Satellite — The Orbital Test Satellite programme was an experimental satellite system inherited by the ESA in 1975 from its predecessor, the European Space Research Organization (ESRO). The first of the pair of OTS satellites (OTS 1) was lost at launch in… …   Wikipedia

  • Space elevator — A space elevator for Earth would consist of a cable anchored to the Earth s equator, reaching into space. By attaching a counterweight at the end (or by further extending the cable upward for the same purpose), the center of mass is kept well… …   Wikipedia

  • Space debris — populations seen from outside geosynchronous orbit (GEO). Note the two primary debris fields, the ring of objects in GEO, and the cloud of objects in low earth orbit (LEO) …   Wikipedia

  • telephone — telephoner, n. /tel euh fohn /, n., v., telephoned, telephoning. n. 1. an apparatus, system, or process for transmission of sound or speech to a distant point, esp. by an electric device. v.t. 2. to speak to or summon (a person) by telephone. 3.… …   Universalium

  • Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry       The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …   Universalium

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”