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Topic: Heliosynchronous orbit

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geostationary orbit

geosynchronous orbit

Earth orbit

orbit mathematics

polar orbit

The Escape Orbit

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single stage to orbit

High Earth Orbit

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	Britain.tv Wikipedia - Satellite
		Inclined Orbit - An orbit whose inclination in refrence to the equatorial plane is not 0.
		Such an orbit also has a velocity equal to the escape velocity and therefore will escape the gravatational pull of the planet and travel until it's velocity relative to the planet is 0.
		Synchronous Orbit - An orbit where the satellite has an orbital period equal to the average rotational period (earth's is: 23 hours, 56 minutes, 4.091 seconds) of the body being orbited and in the same direction of rotation as that body.
	www.britain.tv /wikipedia.php?title=Satellite (3050 words)

	Satellite (Site not responding. Last check: 2007-10-18)
		Moons by contrast are not in a heliocentric orbit but rather orbit their parent planet.
		Such an orbit also has a velocity equal to the escape velocity and therefore will escape the gravatational pull of the planet and travel until it's velocity relative to the planet is 0.
		Synchronous Orbit - An orbit where the satellite has an orbital period equal to the average rotational period (earth's is: 23 hours, 56 minutes, 4.091 seconds) of the body being orbited and in the same direction of rotation as that body.
	en.encyclopediahome.com /wiki/Satellite (3049 words)

	Satellite constellation for measuring atmospheric wind speeds using doppler lidar - Patent # 6634600 - PatentGenius
		The orbit is a polar or quasi-polar orbit, with an orbital altitude from 350 to 500 km.
		In one embodiment of the invention the orbit is a polar or quasi-polar orbit.
		The orbit of the satellites in the constellation is advantageously a polar or quasi-polar orbit; a quasi-polar orbit is an orbit whose inclination is from approximately 80.degree.
	www.patentgenius.com /patent/6634600.html (4339 words)

	Sun-synchronous orbit - Wikipedia, the free encyclopedia
		A sun-synchronous orbit (also rarely called a heliosynchronous orbit) is a geocentric orbit which combines altitude and inclination in such a way that an object on that orbit passes over any given point of the Earth's surface at the same local solar time.
		Variations on this type of orbit are possible; a satellite could have a highly eccentric sun-synchronous orbit, in which case the "fixed solar time of passage" only holds for a chosen point of the orbit (typically the perigee).
		Special cases of the sun-synchronous orbit are the noon/midnight orbit, where the local solar time of passage for equatorial longitudes is around noon or midnight, and the dawn/dusk orbit, where the local solar time of passage for equatorial longitudes is around sunrise or sunset, so that the satellite rides the terminator between day and night.
	en.wikipedia.org /wiki/Sun-synchronous_orbit (617 words)

	Heliosynchronous orbit - Wikipedia, the free encyclopedia
		By analogy with the geosynchronous orbit, a heliosynchronous orbit is a heliocentric orbit where the satellite's period of revolution matches the Sun's period of rotation.
		Similar to the geostationary orbit, the heliostationary orbit is the heliosynchronous orbit of inclination zero and eccentricity zero, so that the satellite would appear stationary to an observer on the Sun's surface.
		An Earth satellite orbit in which the orbital plane is near polar and the altitude is such that a satellite will always pass over a specific place on the Earth at the same time and at fixed time intervals.
	en.wikipedia.org /wiki/Heliosynchronous (200 words)

	Method of controlling the attitude control for satellites on an orbit inclined relative to the equator - Patent 5794891
		The attitude of a satellite placed on a non-heliosynchronous earth orbit in a plane that is inclined relative to the equatorial plane of the earth is controlled for efficient use of solar panels and radiators.
		For a satellite placed on an inclined orbit that is not heliosynchronous, at an inclination angle i relative to the equator plane, the angle.beta.
		The second predetermined value is advantageously that for which the mean efficiency of the solar cells and/or the mean efficiency with which heat is dumped by the radiators during one orbit is the same for the modified sun-nadir law and for the attitude control law in which the satellite is moved into a symmetrical position.
	www.freepatentsonline.com /5794891.html (3069 words)

	The application of remote sensing technology to marine fisheries: an introductory manual
		The theoretical orbit of a satellite is an ellipse.
		Two particular orbits are described by the near complete earth coverage of environmental satellites: the geosynchronous orbit and the sun- synchronous (heliosynchronous) orbit.
		Satellites in these orbits move in the same direction as the rotation of the earth (prograde) and their velocities are adjusted to maintain the satellites position over a designated point on the earth's surface.
	www.fao.org /docrep/003/t0355e/T0355E03.HTM (1344 words)

	Aviso/Altimetry - Missions: Topex/Poseidon: the orbit
		The orbit configuration was chosen to optimize the study of the temporal large scale oceanic variability and avoid aliasing different tidal constituents to the same frequency.
		A high orbit altitude was also selected to minimise atmospheric drag and gravity forces acting on the satellite, and make orbit determination easier, more accurate.
		A satellite orbit slowly decays due to air drag, and has long-period variability due to the inhomogeneous gravity field of Earth, solar radiation pressure, and smaller forces.
	www.jason.oceanobs.com /html/missions/tp/orbite_uk.html (315 words)

	ONERA - MICROSCOPE Mission (Site not responding. Last check: 2007-10-18)
		The controlled electrostatic field, added to break the experimentation symmetry by forcing the masses to remain on the same orbit is accurately measured: a defect of symmetry gives rise to evidence of an EP violation.
		MICROSCOPE experiment concept: the two masses fall around the Earth, controlled along the same orbit; in case of EP violation, the electrostatic force (in red) is accurately measured along the rotating instrument frame (in fl).
		Rotations of the observational frame with respect to the Earth gravity field frame help also in the discrimination of the eventual EP violation signal from the instrument and environment sources of noise.
	www.onera.fr /microscope/mission.html (384 words)

	Glossary of Satellite Terms
		That circular orbit in space 22,237 miles from the surface of the earth at which geosynchronous satellites are placed.
		Satellites placed in these orbits, although traveling around the earth at thousands of miles an hour, appear to be stationary when viewed from a point on the earth, since the earth is rotating upon its axis at the same angular rate that the satellite is traveling around the earth.
		Heliosynchronous orbits are used for Earth observation or solar-study satellites.
	www.satnews.com /free/glossary.html (7808 words)

	Help: Orbit generator
		In particular, the radiation sources and effects models use the segment and mission lengths to scale orbit averaged fluxes to segment and mission fluences, or to add dose contributions from trapped particles to those from solar protons (which are defined for the total mission length only).
		The orbit inclination is the angle between the orbital plane and the equatorial plane, measured at the ascending node in the direction of orbital motion.
		The orbit inclination is derived from the altitude.
	www.spenvis.oma.be /spenvis/help/models/sapre.html (1726 words)

	Remote sensing information, data processing and analysis
		With SPOT4 which was placed in orbit in 1998, the HRV was extended with a Blue band and renamed to HRVIR, but also a new LR-sensor was added: VEGETATION (or VGT for short).
		Orbit : Just like NOAA the SPOT-platform follows a near-circular, heliosynchronous orbit at a height of ± 830 km, with a near-polar inclination of ± 100° and a frequency of 14.1 cycles per day.
		SPOT however scans the daylight/sunlit part of the earth during the descending part (north to south) of its track, and the local overpass times are situated in the late morning (10h30' at the equator) instead of around 14h for the NOAA's with a noon orbit (table 4-1).
	agrifish.jrc.it /marsstat/Crop_Yield_Forecasting/METAMP/03000003.HTM (1413 words)

	observation satellite revOsat new way to observe satellites observation 2005-07.htm
		The referent time of the board is 22h, day zero, satellite and of course orbit being over referent site, revolution n°0 and Tide high level at that time.
		Every three days the orbit is the same.21 hour later after 43 revolutions.(795 kms high).Tides and transits are similar every 17 days.
		Scanning latitude -66 +66°.Every 10 days after 127 revolutions and 2 hours earlier (so period is 9.916 days), Orbit is the same and at the same height.
	revosat.free.fr /2005/2005-09/2005-09.htm (459 words)

	Types Of Satellites
		There are four types of orbit associated with satellites, and the type of orbit dictates a satellite's use.
		The orbits are designed so that the satellite's orientation is fixed relative to the Sun throughout the year, allowing very accurate weather predictions to be made.
		Geosynchronous and geostationary satellites are typically orbiting at 35,788 km (22,238 miles) above the surface of the planet (42,000 km from its centre).
	www.telescope.org /nuffield/pas/moon/moon9e.html (639 words)

	Satellite Encyclopedia Article @ Dimeras.net (Site not responding. Last check: 2007-10-18)
		BEIJING (Reuters) - China put a communications and broadcast satellite into orbit on Sunday, the latest in a 10-year string of successful space launches, the...
		Useful for image taking satllites because shadows will be the same on every pass.
		Dimeras.net is designed and maintained by Kurt Karr and is hosted by pair Networks.
	www.dimeras.net /encyclopedia/Satellite (3211 words)

	RussianSpaceWeb.com
		On July 19, 2006, Russian space agency, Roskosmos, announced that it is re-focusing its future plans from the development of the Kliper reusable transport to the low Earth-orbit, to a Soyuz-based vehicle capable of missions around the Moon.
		The NORAD radar found Cosmos-2420 in the 167 by 337-kilometer orbit with the inclination 67.15 degrees toward the Equator, which is consistent with the orbital parameters of the Kobalt and Yantar-4KS-type satellites.
		It carried eight payloads for several countries intended for a sun-synchronous orbit with the altitude of 690 kilometers and the inclination of 98.2 degrees toward the Equator.
	www.russianspaceweb.com (7211 words)

	EARTH ORBIT AROUND THE SUN: Tired of searching for Orbit? This way! (Site not responding. Last check: 2007-10-18)
		Earth orbit around the sun: Scientists hope a pair of satellites recently sent into space will help them understand solar explosions of electrified gas and particles that cause the Northern Lights and can disrupt power grids on Earth.
		Earth orbit around the sun: A pair of spacecraft has blasted off on a mission to provide a 3D view of huge eruptions from the sun that can damage satellites earth orbit around the sun, disrupt electrical and communications systems on Earth and endanger astronauts.
		The center of the earth orbit around the sun Earth's orbit is approximately the Sun; earth orbit around the sun the center of Mars' orbit is about earth orbit around the sun 22 million miles from the Sun.
	podcast-teleprompter-pro.com /orbit/Earth-orbit-around-the-sun.html (277 words)

	Know your orbit
		All orbits are defined by a small number of orbital parameters which describe their size, shape and orientation in space, the main ones being the height of the orbit above the Earth’s surface, its eccentricity and its inclination.
		The height of an orbit is more likely to be quoted than its diameter (which is measured from the center of the Earth), because it is directly related to practical matters, such as how far radio signals have to travel and the breadth of the coverage area.
		An orbit used particularly by Earth observation or remote sensing satellites is the sun-synchronous or heliosynchronous orbit.
	telephonyonline.com /news/telecom_know_orbit/index.html (2030 words)

	Effects
		The ionising dose contributions of trapped protons and electrons are illustrated in figure 9, which shows dose in Si (calculated with the SHIELDOSE code (14)) as a function of shielding thickness accumulated over an 800 km heliosynchronous orbit.
		Ionising doses in Si as a function of Al shielding thickness for an 800 km heliosynchronous orbit.
		It should be noted that for this orbit trapped proton doses are higher than solar flare proton doses except for the lowest shielding thicknesses.
	www.oma.be /BIRA-IASB/Scientific/Topics/SpacePhysics/Effects.html (271 words)

	Press Release (Site not responding. Last check: 2007-10-18)
		Evry, France, January 4, 2005 - Two Pleiades Earth observation satellites are to be launched from the Guiana Space Center in Kourou, French Guiana under terms of a contract awarded to Arianespace by the CNES French space agency.
		Both Pleiades spacecraft will be placed in heliosynchronous orbit by Soyuz launchers - with the initial satellite orbited in 2008, followed by the second in 2009.
		The Pleiades satellites comprise the high-resolution optical imaging component in the Franco-Italian Orfeo system, for which Italy is supplying the radar component.
	www.arianespace.com /site/news/releases/presrel05_1_4_pleiades.html (160 words)

	YourArt.com >> Encyclopedia >> satellite (Site not responding. Last check: 2007-10-18)
		He calculated the escape velocity from Earth into orbit at 8 km/second and that a multi-stage rocket fueled by liquid oxygen and liquid hydrogen would be required.
		{{mainTimeline of first orbital launches by nationality}} This list includes countries with an independent capability to place satellites in orbit, including production of the necessary launch vehicle.
		Note: many more countries have the capability to design and build satellites — which relatively speaking, does not require much economic, scientific and industrial capacity — but are unable to launch them, instead relying on foreign launch services.
	www.yourart.com /research/encyclopedia.cgi?subject=/satellite (3091 words)

	bird supplies, bird toys, bird food, bird cages (Site not responding. Last check: 2007-10-18)
		All masses that are part of the solar system, including the Earth, are satellites either of the Sun, or satellites of those objects, such as the Moon.
		Although a satellite may orbit at almost any altitude, satellites are commonly categorized by their altitude:
		For this particular orbit type, it is more common to identify the satellite as a spacecraft.
	www.birdsuppliesiworld.com /wiki3-Satellite (1902 words)

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