orbital and Planetary orbit orbital possibilities. Image Orbits around earth scale diagram.svg thumb Various earth orbits to scale light blue represents lowearthorbit. File Sunrise To Sunset Aboard The ISS.OGG thumb Roughly half an orbit of the ISS . A lowEarthorbit LEO is generally defined as an orbit within the Locus mathematics locus extending from the Earth s surface up to an altitude of 2,000 ... Atmospheric reentry Satellite phone References Reflist orbits DEFAULTSORT LowEarthOrbit Category ... basse ko id Orbit bumi rendah it Lowearthorbit he hu Alacsony F ld k r li ... approximately 500 km and up , depending on orbit height. LEO is an orbit around Earth between ... 300 km because that would be impractical due to the larger atmospheric drag. Equatorial lowEarth orbits ELEO are a subset of LEO. These orbits, with low inclination to the Equator, allow rapid revisit times and have the lowest delta v requirement of any orbit. Orbits with a high inclination angle are usually called polar orbit s. Higher orbits include medium Earthorbit MEO , sometimes called intermediate circular orbit ICO , and further above, geostationary orbit GEO . Orbits higher than loworbit can lead to earlier failure of electronic components due to intense radiation and charge ... Solar System Space List of orbits Escape velocity Medium EarthOrbit MEO Highly Elliptical Orbit ... accepted definition for LEO is between 160 2,000 km 100 1,240 miles above the EarthEarth s surface ... km mi 0 abbr on to convert 346.9 km mi 0 abbr on above the Earth s surface. ref cite web url http www.space.gc.ca ... one complete revolution around the Earth in about 90 minutes, many communication satellites require geostationary orbits, and move at the same angular velocity as the Earth. Since it requires less energy ... detail that can be gained. Remote sensing satellites can also take advantage of Sun synchronous orbit .... ENVISAT is one example of an Earth observation satellite that makes use of this particular ... more details
Earth to Orbit ETO describes the process or means of placing a Payload air and space craft payload into an orbit around the Earth . Traditionally this has used rockets, however ETO can also include much more exotic forms of transportation such as railgun s and hypersonic cannon s and Space elevator s. Methods Earth to orbit transportation can be roughly broken up into four groups, these are Rocket transportation Ballistic methods Orbital transportation Relay transportation Rocket Based Transportation image Gemini VI Launch GPN 2000 000612.jpg thumb right 200px Titan II Rocket Launch A series of suborbital rocket s are used in order to accelerate a payload to orbital velocities. This is the only method of placing a payload into an earthorbit which has been successfully used. It involves constructing ... This method uses a satellite , already in earthorbit to impart part of the required momentum to accelerate .... Other schemes involving SSTO or Single Stage To Orbit vehicles have been proposed. However they all suffer from a low Mass fraction , reducing their effectiveness for transporting payloads into orbit. Ballistic methods A stationary platform at least partly in Earth s atmosphere that delivers the required momentum by using the Earth to react against. Examples of this may be a rail gun , coil gun ... deceleration due to air drag 500m s 2 . Lofstrom loops also have low accelerations but gun designs ... of the tether must be recovered, otherwise the tether itself may reenter the Earth s Atmosphere ... zero relative velocity to the Earth s surface. It is not effected by atmospheric heating that would otherwise destroy an object entering earth s atmosphere without a Heat shield . Relay Transportation ... into orbit. See also Orbital spaceflight Spacecraft propulsion Space elevator Space fountain Tether propulsion Skyhook structure Skyhook References refbegin cite web last Nowicki first Andrew title Earth to Orbit Transportation Bibliography url http www.islandone.org LEOBiblio accessdate 2005 02 18 ... more details
Heliocentric Solar System In astronomy , the Earth s orbit is the motion of the Earth around the Sun ... of the Earth s axial tilt results in the season s. Events in the orbit By astronomical convention ... than the more distant Sun and planets. Objects must orbit the Earth within this radius, or they can ... orbit. The orbital ellipse with eccentricity exaggerated for effect goes through each of the six Earth ... ref By most predictions, Earth s orbit will be relatively stable over long periods. ref Gribbon ... the Earth would be in its orbit in just over 100 million years time. Modeling the solar system is subject ... accessdate 2007 03 21 ref See also geocentric orbit an orbit of any object orbiting the Earth, such as the Moon ... Earth s Orbit Category Earth Category Dynamics of the Solar System da Jordbane de Erdbahn es ... 365.256363 of these to orbit the sun once in the sense of returning to the same position relative to the stars. Such an orbit relative to the stars is called a sidereal year. ref This motion gives ... diameter every 12 hours eastward, as seen from Earth. On average it takes 24 hours&mdash a Solar time solar day &mdash for Earth to complete a full rotation about its axis relative to the Sun so that the Sun returns to the Meridian astronomy meridian . The orbital speed of the Earth around the Sun .... ref name earth fact sheet cite web last Williams first David R. date 2004 09 01 url http nssdc.gsfc.nasa.gov planetary factsheet earthfact.html title Earth Fact Sheet publisher NASA accessdate 2007 03 17 ref Viewed from a vantage point above the north poles of both the Sun and the Earth, the Earth ... the Earth and the Sun would appear to rotate in a counterclockwise direction about their respective ... to geocentrism , which places the earth at the center. In the 16th century, Nicolaus Copernicus ... on the earth main seasons Because of the axial tilt of the Earth often known as the obliquity of the ecliptic , the inclination of the Sun s trajectory in the sky as seen by an observer on Earth ... more details
Lunar Module Lunar Modules into lowEarthorbit, and then firing again to send both spacecraft ...File Gemini 6 7.jpg thumb right 200px Gemini 7 as seen from Gemini 6 during their rendezvous in Earthorbit in 1965. NASA Earthorbit rendezvous EOR is a type of space rendezvous and a spaceflight methodology most notable for enabling round trip human missions to the moon. ref LOWEARTHORBIT RENDEZVOUS STRATEGY FOR LUNAR MISSIONS http www.informs sim.org wsc06papers 158.pdf ref While considered and ultimately rejected by NASA for the Apollo Program Apollo moon landing missions in favor of its cousin Lunar orbit rendezvous LOR , Earthorbit rendezvous was an integral component of Project Constellation Project Constellation s planned human spaceflight missions to the Moon beginning around 2020 before that program s Barack Obama space policy speech at Kennedy Space Center cancellation in October ... The Agena target vehicle was used for testing Earthorbit rendezvous in the NASA Gemini Program . Gemini 6 and Gemini 7 rendezvoused in orbit in 1965, but without Agena. Next, Gemini 8 successfully ... to go to the Moon in orbit around the Earth , then assemble them in orbit. Experiments of Project ... Constellation as the Earth Departure Stage EDS and Altair spacecraft Altair LSAM , which would be launched into lowEarthorbit on the Ares V rocket. The EDS and Altair would be met by the separately launched Orion spacecraft Orion CEV . Once joined in lowEarthorbit, the three would then travel out to the Moon and the Orion Altair combination would fly a lunar orbit rendezvous flight pattern. Citation needed date September 2010 References references DEFAULTSORT EarthOrbit Rendezvous Category Spaceflight Category Apollo program Category Space rendezvous Spacecraft stub it EarthOrbit Rendezvous ... 163092main constellation program overview.pdf ref ref Lunar Orbit Rendezvous and the Apollo Program ... of this program. In the end, NASA employed the Lunar Orbit Rendezvous for the Project Apollo ... more details
File Orbitalaltitudes.jpg thumb To scale diagram of low, medium and high earth orbits A High EarthOrbit is a geocentric orbit whose apogee lies above that of a geosynchronous orbit convert 35,786 km mi . ref name nasa http gcmd.nasa.gov User suppguide platforms orbit.html Definitions of geocentric orbits from the Goddard Space Flight Center ref Highly Elliptical Orbit s are a subset of High Earth Orbits. ref name nasa Examples of satellites in High EarthOrbit class wikitable Name NSSDC ID Launch Date Perigee Apogee Period Inclination Eccentricity Highly Elliptical Orbit Molniya satellite Molniya 1 01 ref http nssdc.gsfc.nasa.gov nmc spacecraftOrbit.do?id 1965 030A Trajectory Details for Molniya 1 01 from the National Space Science Data Center ref 1965 030A 1965 04 23 538 km 39,300 km 708.0 min 65.0 0.736864 yes Vela satellite Vela 1A ref http www.astronautix.com craft vela.htm Vela at Encyclopedia Astronautica ref ref http nssdc.gsfc.nasa.gov nmc spacecraftOrbit.do?id 1963 039A Trajectory Details for Vela 1A from the National Space Science Data Center ref 1963 039A 1963 10 17 101,925 km 116,528 km 6,519.6 min 37.8 0.063 no References reflist orbits DEFAULTSORT High EarthOrbit Category Earth orbits ja tr Y ksek D nya y r ngesi ... more details
Infobox VG title E.O.S. EarthOrbit Station image Image Earthorbitstations.jpg developer Karl Buiter publisher Electronic Arts designer engine released 1987 genre Construction and management simulation game modes Single player , Multiplayer ratings platforms Commodore 64 , Apple II media Floppy disk requirements input Computer keyboard Keyboard E.O.S. EarthOrbit Stations was a space station construction and management simulation games management simulation developed by Karl Buiter and produced by Joe Ybarra for Electronic Arts in 1987 for the Commodore 64 , Apple II , and Apple Macintosh . The game focused on both the material and economic challenges of building a permanent, fully functioning space station in geocentric orbit . The game was set in 1996, and the player was given various selected scenarios to fulfill, from mundane tasks such as setting up a simple space station to developing and supplying a specified amount of high grade, zero G pharmaceutical s to being the first to contact alien life. The game also was a cut throat strategy game in multiplayer, as players competed over finite resources and resource management. A review in Computer Gaming World had mixed feelings about the game. While the single player portion was praised, the review felt the game had too high a learning curve to be really suitable for multiplayer. The user interface was particularly bothersome, described as a textbook case of how not to design a window menu graphics interface. The documentation was similarly described as poorly organized and cryptic. ref name CGW citation date October 1987 last Williams first Gregg periodical Computer Gaming World title EarthOrbit Stations year 1987 pages 26 27 ref References reflist Similar games M.U.L.E. Project Space Station Project Space Station Space Shuttle A Journey Into Space External links moby game id earthorbit stations name EarthOrbit Stations Category 1987 video games Category Commodore 64 games Category Apple II games Category Business ... more details
In Orbit may refer to In Orbit September album In Orbit September album In Orbit Clark Terry album In Orbit Clark Terry album In Orbit , an album by The Stomachmouths See also Orbit disambiguation disambig ... more details
. For example, perigee and apogee are the lowest and highest parts of an Earthorbit. In the elliptical orbit, the center of mass of the orbiting orbited system is at one focus geometry focus of both ... small relative to the Earth s mass that produces a circular orbit , as shown in C . As the firing ... velocities these will come closest to the Earth at the point half an orbit beyond, and directly opposite ... properly, perifocus or pericentron when the orbit is around a body other than Earth. The point where ... gravity situations such as orbits close to the Sun . Earth orbits Main Geocentric orbit Scaling ... NOAA page on Climate Forcing Data includes calculated data on Earthorbit variations over the last ... by Varadi, Ghil and Runnegar 2003 provide another, slightly different series for Earthorbit eccentricity ... of orbit are similar to the Pluto Charon moon Charon system. In physics , an orbit is the gravitationally curved path of an object around a point in space, for example the orbit of a planet around the center ... topic 431123 orbitorbit astronomy &ndash Britannica Online Encyclopedia ref Orbits of planets are typically ... planet s, asteroid s a.k.a. minor planets , comet s, and space debris orbit the Barycentric coordinates astronomy barycenter in elliptical orbit s. A comet in a Parabolic trajectory parabolic or Hyperbolic trajectory hyperbolic orbit about a barycenter is not gravitationally bound to the star and therefore ... gravitational perturbations , the eccentricity orbit eccentricities of the planetary orbits vary ... orbit. At the present Epoch astronomy epoch , Mars has the next largest eccentricity while the smallest orbital eccentricities are seen in Venus and Neptune . As two objects orbit each other, the periapsis .... As an illustration of an orbit around a planet, the Newton s cannonball model may prove useful see ... are ignored or perhaps the mountain is high enough that the cannon will be above the Earth ... If the cannon fires its ball with a low initial velocity, the trajectory of the ball curves downward ... more details
ORBit is a Common Object Request Broker Architecture CORBA 2.4 compliant Object Request Broker ORB . It features mature C programming language C , C and Python programming language Python bindings, and less developed bindings for Perl , Lisp programming language Lisp , Pascal programming language Pascal , Ruby programming language Ruby , and Tcl . Most of the code is distributed under the GNU Lesser General Public License LGPL license, although the Interface Definition Language IDL compiler and utilities use the GNU General Public License GPL . ORBit was originally written to serve as middleware for the GNOME project, but has seen use outside of the project. External links Portal Free software http www.gnome.org projects ORBit2 ORBit2 Home Page http orbit resource.sourceforge.net ORBit Resource Page GNOME Interlang DEFAULTSORT Orbit Categories Category GNOME Software stub GNOME stub fr ORBit pt ORBit ... more details
Transfer orbit can mean one of the following Hohmann transfer orbit Geostationary Transfer Orbit or Geosynchronous Transfer Orbit list stub date February 2011 dab Category Astrodynamics Category Earth orbits ... more details
pass, it is desirable for the orbit to be as short as possible, which is to say as low as possible. However, very low orbits of a few hundred kilometers would rapidly decay due to drag from the atmosphere ... orbit on the sun side then takes only 50 minutes, during which local time of day does not greatly vary. To retain the sun synchronous orbit as the earth revolves around the sun during the year, the orbit ... Technology orbits DEFAULTSORT Polar Orbit Category Astrodynamics Category Earth orbits ar ...Image Polar orbit.ogg thumb 200px Polar orbit A polar orbit is an orbit in which a satellite passes above or nearly above both Geographical pole pole s of the body usually a planet such as the Earth , but possibly another body such as the Sun being orbited on each revolution. It therefore has an inclination of or very close to 90 Degree angle degree s to the equator . Except in the special case of a polar geosynchronous orbit , a satellite in a polar orbit will pass over the equator at a different longitude on each of its orbits. Polar orbits are often used for earth mapping, earth observation satellite earth observation , and reconnaissance satellite reconnaissance satellites, as well as for some weather satellite s. The Iridium satellite constellation also uses a polar orbit to provide telecommunications services. The disadvantage to this orbit is that no one spot on the Earth s surface can be sensed continuously from a satellite in a polar orbit. It is common for near polar orbiting satellites to 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 ..., this would not happen. But because of the earths equatorial bulge, an orbit inclined at a slight ... the pole produces the desired precession in a 100 minute orbit. ref name phy6 A satellite can hover ... orbit with its apogee above that area. This is the principle behind a Molniya orbit . See ... more details
orbit on the far side of the Moon Earth Moon L2 as a communications relay station for an Apollo program Apollo mission to the far side of the Moon. A spacecraft in such a halo orbit would be in continuous view of both the Earth and the far side of the Moon. In the end, neither a communication link ... mission to use a halo orbit was Genesis spacecraft Genesis , launched in 2001, which also pioneered the use of Dynamical systems theory to find low energy trajectories to and from the halo orbit. See also Lissajous orbit , another Lagrangian point orbit. James Webb Space Telescope will be in a Halo orbit around L2 for the Sun Earth system. References references Links https www.cds.caltech.edu help ... partners edu SFMpaper.pdf Low Energy Interplanetary Transfers Using Halo Orbit Hopping Method ...A halo orbit is a periodic, three dimensional orbit near the L1 , L2 , or L3 Lagrange points in the N body problem Three body problem three body problem of orbital mechanics. A spacecraft in a halo orbit does not technically orbit the Lagrange point itself which is just an equilibrium point with no mass ... body systems, such as the Sun Earth system and the Earth Moon system. Continuous families of both ..., orbital stationkeeping stationkeeping is required to keep a satellite on the orbit. Image LL2 Halo Example Synodic.gif frame right Halo orbit from above in a frame rotating with the two primary bodies. The blue sphere is the Earth, the gray sphere is the Moon, and the two red spheres are the Lagrange ... flight. The first mission to use a halo orbit was ISEE 3 , launched in 1978. It traveled to the Sun Earth L1 point and remained there for several years. The next mission to use a halo orbit was SOHO spacecraft SOHO , a joint ESA and NASA mission to study the sun, which arrived at Sun Earth L1 in 1996. It used an orbit similar to ISEE 3. ref Dunham, D.W. and Farquhar, R. W. Libration Point Missions ... used non periodic orbits also called Lissajous orbit s that are slightly different from halo orbits ... more details
Unreferenced stub auto yes date December 2009 A subsynchronous orbit is an orbit of a satellite that is nearer the planet than it would be if it were in synchronous orbit , i.e. the orbital period is less than the sidereal day of the planet. An Earth satellite that is in a prograde subsynchronous orbit will appear to drift eastward as seen from the Earth s surface. See also supersynchronous orbit List of orbits Orbits DEFAULTSORT Subsynchronous Orbit Category Orbits Category Astrodynamics Astronomy stub ... more details
is used to move a satellite from lowEarthorbit LEO into a geostationary orbit. A worldwide network ... www.isoc.org inet96 proceedings g1 g1 3.htm The Teledesic Network Using LowEarthOrbit Satellites ...Image Geostat.gif thumb right Geostationary orbit. To an observer on the rotating Earth brown dot on the blue sphere , the satellite appears stationary in the sky. A geostationary orbit or Geostationary EarthOrbit GEO is a geosynchronous orbit directly above the Earth s equator 0 latitude , with a period equal to the Earth s rotational period and an orbital eccentricity of approximately zero. An object in a geostationary orbit appears motionless, at a fixed position in the sky, to ground observers ... orbit radius for the Earth http www.braeunig.us space orbmech.htm ORBITAL MECHANICS Rocket and Space ... Earth orbits Category Artificial satellites in geosynchronous orbit az Geostasionar orbit bg ... of a geostationary orbit was first disseminated on a wide scale in a 1945 paper entitled Extra Terrestrial ... Arthur C. Clarke , published in Wireless World magazine. The orbit, which Clarke first described as useful ... called the Clarke Orbit . ref cite web publisher NASA url http www2.jpl.nasa.gov basics bsf5 ... Orbit is about convert 265000 km mi 3 abbr on long. Geostationary orbits are useful because they cause a satellite to appear stationary with respect to a fixed point on the rotating Earth, allowing ... in the direction of the Earth s rotation, at an altitude of 1 E7 m convert 35786 km mi 0 abbr on above ground, producing an orbital period equal to the Earth s period of rotation , known as the sidereal ... above this line. Note how the satellites are pinpoint, while stars have created small trails due to the Earth s rotation. A geostationary orbit can only be achieved at an altitude very close to convert ... day or 23.934461223 hours. This makes sense considering that the satellite must be locked to the Earth ... they run out of thruster fuel . Such satellites will either continue to be used in inclined orbit s where ... more details
a geostationary orbit would require considerable power due to the low Angle of incidence grazing ... as the Earth turns, making tracking difficult. Likewise, an inclined equatorial orbit could be used to move the satellite northward on one half of its orbit, but the satellite would pass ... period of time. Due to the Earth s rotation, the apogee point is different for each orbit. In order ... similar Tundra orbit has an orbital period of 24 hours. In general, the oblateness of the earth Perturbation ... orbits is as follows just considering the effect of the Earth s oblateness J sub 2 sub on the orbit ... Astrodynamics Category Earth orbits ca rbita Molnia de Molnija Orbit es rbita de M lniya fr ...Other uses Molniya disambiguation morefootnotes date April 2009 A Molniya orbit is a type of highly elliptical orbit with an inclination of 63.4 Degree angle degree s and an orbital period of precisely ... have been using this type of orbit since the mid 1960s. A satellite placed in a Molniya orbit spends most of its time over a designated area of the earth as a result of Apsis apogee dwell see Kepler ... directly down on them, but a typical near circular sun synchronous orbit would put the satellite ... to this problem is to make the orbit highly elliptical. The speed of a satellite in its orbit is a declining function of the distance from the focus, in this case the center of the Earth. So by making the satellite come close to the Earth during one part of its orbit this area will be passed over quite quickly, while at the other side of the orbit, when it is more distant, it will cover the distance slowly. By orbiting eastward, the satellite s angular speed is close to the Earth s rotation ... type orbits have a period of 12 hours, making them appear over Russia daily, on every second orbit ... keeping thruster burns. To avoid this expenditure of fuel, the Molniya orbit uses an inclination of 63.4 , for which these perturbations are zero. Uses The primary use of the Molniya orbit was for the communications ... more details
LowEarthorbit an ellipse with vertical major axis, with the center of the Earth as the near ... distance is il math frac v 2 2g math 100 . The energy at the surface of the Earth corresponds to that of an elliptic orbit with math a R 2 , math with math R , math the radius of the Earth , which ...Mergeto Kepler orbit date November 2009 In astrodynamics an orbit equation defines the path of orbiting ... such as gravity , has an orbit that is a conic section i.e. circular orbit , elliptic orbit ... trajectory can only be the part above the surface, but for that part the orbit equation and many related ... the orbit equation is math r h 2 over mu 1 over 1 e cos theta math or math u 1 e cos theta over ... angular momentum of the orbiting body math e , math is the eccentricity mathematics eccentricity of the orbit, also called the orbital eccentricity math a , math is the semi major axis of the orbit taken ..., together with math e , math , fully determines the geometry of the orbit. For a given orbit, the larger ... or hyperbolic orbit the motion is either away from the central body, or towards it. if the energy ..., then the standard assumptions no longer apply, as in atmospheric reentry . Low energy trajectories If the central body is the Earth, and the energy is only slightly larger than the potential energy at the surface of the Earth, then the orbit is elliptic with eccentricity close to 1 and one end of the ellipse just beyond the center of the Earth, and the other end just above the surface. Only a small ... above the surface of the orbit is the length of the ellipse, minus math R , math , minus the part below the center of the Earth, hence twice the increase of math a , math minus the periapsis distance ... be distinguished from the parabolic orbit in the sense of astrodynamics, where the velocity is the escape ... horizontal, near the surface of the Earth. For increasing speeds at this point the orbits are subsequently part of an ellipse with vertical major axis, with the center of the Earth as the far focus ... more details
Orphan date February 2009 Gate orbits are optimal circular departure orbits for transfer from one planet to another. At certain specific orbits around a cosmic body, the additional delta v delta v required to go from orbital velocity to hyperbolic trajectory for an interplanetary transfer, is minimal. Gate orbits can therefore be very useful for minimising the delta v budget delta v budget for an interplanetary trip. For example, the required delta v for a Hohmann transfer orbit from the Earth to Mars considering Earth at 1 AU and Mars at 1.52 AU is 2.94 km s. To reach 2.94 km s at infinity from a low Earth orbit at, say 200 km altitude, requires a 3.61 km s burn. If the vehicle were to leave the Earth s attraction from the 92,000 km high Mars gate orbit instead, required delta v would be only 2.08 km s. At higher still orbits the required delta v rises again. For example, at 150,000 km, required delta v is now 2.17 km s. Reducing the delta v from 3.61 to 2.08 km s can reduce the total mass of the vehicle by as much as 38 , or increase the payload by 62 The radius of a given gate orbit can be calculated using the following equation math r 2 mu over v infty 2 math where math r , math is the distance between the orbiting body and the central body , in km math mu , math is the standard gravitational parameter , in km sup 3 sup s sup 2 sup math v infty , math is the required velocity at infinity, in km s sup 1 sup . Remember math v infty 2 math is also known as math C3 math External links http www.christov.com space IGO 5.pdf Interplanetary Gate Orbits by Marco Christov Category Spaceflight Category Orbital maneuvers ... more details
Chapter 3.4 ref For non LowEarthorbit LEO missions, the desired location for the final burn may not be in a convenient spot. In particular, for earth escape missions that want good northern coverage ... orbits, for several reasons. The station is in a high inclination LowEarthorbit , where parking orbits ... orbit tli.htm title Apollo Flight Journal Apollo 8, Day 1 EarthOrbit and Translunar Injection ...A parking orbit is a temporary orbit used during the launch of a satellite or other space probe . A launch vehicle boosts into the parking orbit, then coasts for a while, then fires again to enter the final desired trajectory. The alternative to a parking orbit is direct injection , where the rocket ... trajectory. There are several reasons why a parking orbit may be used image ParkingOrbit.jpg frame center Parking orbit for one of the early Ranger program Ranger missions to the moon. Note that the launch ... A History of Project Ranger ref . It can increase the launch window . For earth escape missions, these are often quite short seconds to minutes if no parking orbit is used. With a parking orbit, these can ... orbit missions, the correct spot for the final or next to final firing is normally on the equator. In such a case, the rocket is launched, coasts in a parking orbit until it is over the equator, then fires again into a geostationary transfer orbit . ref cite book title Spacecraft Mission ... orbit restart equatorial page 83 . ref For Apollo program manned lunar missions , a parking orbit ... It is needed if the desired orbit has a high perigee . In this case the booster launches into an elliptical parking orbit, then coasts until a higher point in the orbit, then fires again to raise the perigee. See Hohmann transfer orbit . In this case the use of a parking orbit can also reduce the fuel ... over southern Africa. As the day progresses, this point stays essentially fixed while the Earth ... , it used a parking orbit to deliver the probe to the right injection spot. The Ariane 5 does not use ... more details
An areocentric orbit is an orbit around the planet Mars . The Moon , by similarity, is in a geocentric orbit around Earth. The areo prefix is derived from the ancient Greek word Ares which is the personification of the planet Mars in Greek mythology . ref http www.thefreedictionary.com areocentric areocentric definition of areocentric by the Free Online Dictionary, Thesaurus and Encyclopedia Bot generated title ref See also Heliocentrism Heliocentric orbit Geocentric orbit List of orbits References references orbits astronomy stub ja sk Areocentrick dr ha ... more details
A satellite is said to occupy an inclined orbit around the Earth if the orbit exhibits an angle other than zero degrees with the equatorial plane . This angle is called the orbit s inclination . A planet is said to have an inclined orbit around the Sun if it has an angle other than zero to the plane of the ecliptic . Special case geosynchronous inclined orbit A geostationary orbit occurs when an object satellite is placed approximately 37,000 km 22,300 miles above the Earth s equator with the characteristic that, from a fixed observation point on the Earth s surface, it appears motionless. A satellite is in an inclined orbit when its orbital plane is tipped some number of degrees from the horizontal defined by the equator. In the case of an inclined geosynchronous orbit, although the satellite remains geosynchronous that is, completing one orbit around the earth every 24 hours , it is no longer geostationary. From a fixed observation point on Earth, it would appear to trace out a small ellipse as the gravitational effects of other stellar bodies Sun & Moon exhibit influence over the satellite, as the effect accumulates over time the trace becomes an analemma with lobes oriented north southward. The satellite traces the same analemma once each sidereal day . A geostationary orbit is not stable. It takes regular manoeuvres to actively counteract the above gravitational forces. The majority of the fuel of the satellite, typically hydrazine is spent for this purpose. Otherwise, the satellite experiences a change in the inclination over time. At the end of the satellite s lifetime, when fuel approaches depletion, satellite operators may decide to omit these expensive manoeuvres ... of following the north south movement, Satellite Tracking earth stations. Before the fuel comes to an end, satellites can be moved to a graveyard orbit to keep the geostationary altitude free for subsequent ... Orbit ... more details
A heliocentric orbit also called circumsolar orbit is an orbit around the Sun . In our Solar System , all planet s, comet s, and asteroid s are in such orbits, as are many artificial Space probe probes and pieces of Space debris debris . Ganymede moon Ganymede , by contrast, is not in a heliocentric orbit as it orbits Jupiter . An interior heliocentric orbit is an orbit inside the orbit of the Earth, for example the orbit of Venus . An exterior heliocentric orbit is an orbit outside the orbit of the Earth, for example the orbit of Mars . The helio prefix is derived from the ancient Greek word helios , meaning sun , and also Helios , the personification of the Sun in Greek mythology . ref name dictionary.com cite web title helio url http dictionary.reference.com browse helio work Dictionary.com Unabridged v 1.1 publisher Random House year 2006 accessdate 2009 02 12 ref See also Heliocentrism Geocentric orbit List of artificial objects in heliocentric orbit List of orbits Earth s orbit References reflist astronomy stub orbits bg cs Heliocentrick dr ha es rbita helioc ntrica eu Orbita heliozentriko fr Orbite h liocentrique it Orbita eliocentrica hu Heliocentrikus p lya nl Heliocentrische baan ja pl Orbita heliocentryczna pt rbita helioc ntrica ru sk Heliocentrick dr ha sv Heliocentrisk bana zh ... more details
For Earthorbit, see Geostationary orbit . For atoms, see Fixed orbit . The term stationary orbit in celestial mechanics refers to an orbit around a planet or moon where the orbiting satellite or spacecraft remains orbiting over the same spot on the surface. From the ground, the satellite would appear to standing still, hovering above the surface in the same spot, day after day. ref name ST Space Today Online Answers To Your Questions , Spacetoday.org, 2010, webpage http www.spacetoday.org Questions PolarSats.html ST Sats . ref In practice, this is accomplished by matching the rotation, of the surface below, by reaching a particular altitude where the orbital speed almost matches the rotation below, in an equatorial orbit. ref name ST As the speed decreases slowly, then an additional boost would be needed to increase the speed back to a matching speed, or a retro rocket could be fired to slow the speed when too fast. The stationary orbit region of space is known as the Clarke Belt , named after British science fiction writer Arthur C. Clarke , who published the idea in Wireless World magazine in 1945. ref name ST A stationary orbit is sometimes referred to as a fixed orbit . Stationary Earthorbit Around the Earth , stationary satellites orbit at altitudes of approximately convert ... the Earth at the same speed the globe is spinning, making them hover stationary over one spot on the Earth s surface. ref name ST A satellite being propelled into place, into a stationary orbit, is first fired to a special equatorial orbit called a geostationary transfer orbit GTO . ref name ST Within this oval shaped elliptical orbit, the satellite will alternately swing out to convert 22,300 mi km 1 high and then back down to an altitude of only convert 100 mi km above the Earth 223 times ... an even, circular orbit at the 22,300 mile altitude. ref name ST References Reflist Category Celestial mechanics Category Earth orbits Category Astrophysics Category Spaceflight eo Fiksa orbito ... more details
Unreferenced stub auto yes date December 2009 about the class of orbits about the Sun class of orbits around the Earth sun synchronous orbit 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 . These orbits occur at a radius of 24.360 giga Gm 0.1628 Astronomical unit AU around the Sun, a little less than half of the orbital radius of Mercury planet Mercury . Similar to the geostationary orbit , the heliostationary orbit is the heliosynchronous orbit of inclination zero and eccentricity orbit eccentricity zero, so that the satellite would appear stationary to an observer on the Sun s surface. To date, no satellites have been put in this kind of solar orbit. See also List of orbits Orbits DEFAULTSORT Heliosynchronous Orbit Category Astrodynamics Category Orbits Astronomy stub physics stub es rbita solar fr Orbite h liostationnaire zh ... more details
A synchronous orbit is an orbit in which an orbiting body usually a satellite has a period equal to the average rotational period of the body being orbited usually a planet , and in the same direction of rotation as that body. Properties A satellite in a synchronous orbit that is both equator ial and circle circular will appear to be suspended motionless above a point on the orbited planet s equator. This is also known as a geostationary orbit . However, a synchronous orbit need not be equatorial nor circular. A body in a non equatorial synchronous orbit will appear to oscillate north and south above a point on the planet s equator, while a body in an ellipse elliptical orbit will appear to oscillate eastward and westward. As seen from the orbited body the combination of these two motions produces a figure 8 pattern called an analemma . Nomenclature Like many orbital terms synchronous orbits take on special names depending on the body being orbited. The following are some of the more common names. A synchronous orbit about the Earth that is circular and lies in the equatorial plane is called a geostationary orbit . The more general case, when the orbit is inclined to the Earth s equator or is non circular is called a geosynchronous orbit . The corresponding terms for synchronous orbits around the planet Mars are Areostationary orbit areostationary and Areosynchronous orbit areosynchronous orbits. Examples An astronomical example is Pluto s moon Charon moon Charon . Much more commonly ... satellites . For natural satellites, which can attain a synchronous orbit only by tidal locking ... orbit is achieved, it has had a locked synchronous rotation for a long time already. See also Subsynchronous orbit Supersynchronous orbit Supersynchronous or Graveyard orbit Synchronous rotation Sun synchronous orbit List of orbits References FS1037C orbits Category Astrodynamics Category Orbits ... sincrona ja ru simple Synchronous orbit zh ... more details
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