stars have created small trails due to the Earth s rotation. A geostationaryorbit , or Geostationary ... 4 origyear 1929 others Translation from original German ref The idea of a geostationaryorbit was first ..., where near geostationary orbits may be implemented. The Clarke Orbit is about convert ... transfer orbitgeostationary transfer orbit is used to move a satellite from low Earth orbit LEO into a geostationaryorbit. Russia n television satellites have used elliptic orbit elliptical ... audience. The first satellite placed into a geostationaryorbit was the Syncom 3, launched by a Delta ... hold itself in a geostationaryorbit with different altitude and or inclination from the traditional equatorial geostationaryorbit. Orbital stability A geostationaryorbit can only be achieved ... in geostationaryorbit must all occupy a single ring above the Equator . The requirement to space ... in geostationaryorbit. This has led to conflict between different countries wishing access ... disposal orbit . Derivation of geostationary altitude In any circular orbit, the centripetal force ... F sub g sub . To calculate the geostationaryorbit altitude, one begins with this equivalence math ... geostationaryorbit is independent of the mass of the satellite. ref In the Geocentric gravitational constant Small body orbiting a central body small body approximation , the geostationaryorbit is independent ... revolution . In the case of a geostationaryorbit, the orbital period is one sidereal day , or nowrap ... . math By the same formula we can find the geostationary type orbit of an object in relation to Mars ... geostationaryorbit Graphical derivation of the geostationaryorbit radius for the Earth http ... sslist.htm List of satellites in geostationaryorbit http www.golombek.com sat Clarke Belt Snapshot ... satellite orbit overview orbits DEFAULTSORT GeostationaryOrbit Category Astrodynamics Category ... geostacjonarna pt rbita geoestacion ria ru simple Geostationaryorbit sk Geostacion rna ... more details
refimprove date June 2009 A geosynchronous transfer orbit or geostationary transfer orbit GTO is a Hohmann transfer orbit used to reach geosynchronous orbit geosynchronous or geostationaryorbit . ref name smad2ed Larson, Wiley J. and James R. Wertz, eds. Space Mission Design and Analysis, 2nd Edition. Published jointly by Microcosm, Inc. Torrance, CA and Kluwer Academic Publishers Dordrecht Boston London . 1991. ref It is a highly ellipse elliptical Earth orbit with apogee at about 35,700 km, geostationary GEO altitude, and an argument of perigee such that apogee occurs on or near the equator. Perigee can be anywhere above the atmosphere, but is usually limited to only a few hundred km above the Earth s surface to reduce launcher delta v math Delta math V requirements and to limit the orbital lifetime of the spent booster. The inclination of a GTO is the angle between the orbit plane and the Earth s equator equatorial plane . It is determined by the latitude of the launch site and the launch azimuth direction . The inclination and eccentricity must both be reduced to zero to obtain a geostationaryorbit. If only the Orbital eccentricity eccentricity of the orbit is reduced to zero, the result is a geosynchronous orbit. Because the math Delta math V required for a plane change is proportional to the instantaneous velocity, the inclination and eccentricity are usually changed ... some launchers can take their payloads all the way to geostationaryorbit, most end their missions ... into the final geostationaryorbit. The five hour coast to first apogee can be longer than ... for an inclination change at either the ascending or descending orbital node node of the orbit is calculated ... generally reach GTO directly, but a spacecraft already in a low Earth orbit Low Earth orbit ... when a geostationary spacecraft is launched from the space shuttle a perigee kick motor attached ... orbit. More complicated trajectories are sometimes used. For example, the Proton rocket Proton M ... more details
Unreferenced date December 2008 The geostationary ring is a volume segment around the geostationaryorbit defined by variations in altitude and declination that can occur for uncontrolled objects left in the geostationaryorbit . The geostationaryorbit 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 math J 2 math , 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 orbit 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 geostationaryorbit that ranges from 75 km below GEO to 75 km above GEO and from 15 degrees to 15 degrees declination. Category Astrodynamics Category Earth orbits de Geostation rer Ring ... 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
unreferenced date April 2011 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
sizes and type 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 ... topic 431123 orbitorbit astronomy &ndash Britannica Online Encyclopedia ref Orbits of planets ... system , planets, dwarf 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 ... to mutual Perturbation astronomy gravitational perturbations , the eccentricity orbit eccentricities ... System, has the most eccentric orbit. At the present Epoch astronomy epoch , Mars has the next largest ... orbit each other, the periapsis is that point at which the two objects are closest to each other ... are used for specific bodies. For example, perigee and apogee are the lowest and highest parts of an orbit around Earth, while perihelion and aphelion are the closest and farthest points of an orbit around the Sun. In the elliptical orbit, the center of mass of the orbiting orbited system is at one ... around a gravitational center. As an illustration of an orbit around a planet, the Newton s cannonball ..., or circumnavigating, orbit. For any specific combination of height above the center of gravity and mass ... is assumed to be very small relative to the Earth s mass that produces a circular orbit , as shown in C ... orbits at slower velocities these will come closest to the Earth at the point half an orbit beyond, and directly ... on the firing height and mass of the planet, an open orbit such as E results a parabolic trajectory ... with mass can thus be considered in four practical classes, with subtypes No orbit Sub orbital spaceflight ... paths with closest point at firing point escape orbit Open or escape trajectories Parabolic ..., and we say that the lighter body is in orbit around the heavier. For the case where the masses of two ... more details
Refimprove date June 2008 A graveyard orbit , also called a supersynchronous orbit , junk orbit or disposal orbit , is an orbit significantly above synchronous orbit , where spacecraft are intentionally placed at the end of their operational life . It is a measure performed in order to lower the probability of collision s with operational spacecraft and of the generation of additional space debris . A graveyard orbit is used when the delta v required to perform a de orbit Orbital maneuver maneuver is too high. De orbiting a geostationary satellite requires a delta v of about 1,500 m s while re orbiting it to a graveyard orbit only requires about 11 m s. For satellites in geostationaryorbit and geosynchronous orbit s, the graveyard orbit is a few hundred kilometer s above the operational orbit. The transfer to a graveyard orbit above geostationaryorbit however requires the same amount of fuel that a satellite needs for approximately three months of stationkeeping . It also requires a reliable attitude control during the transfer maneuver. While most satellite operators try to perform such a maneuver at the end of the operational life, only one third succeed in doing so. Fact date August 2007 According to the Inter Agency Space Debris Coordination Committee IADC ref http www.iadc online.org docs pub IADC UNCOPUOS final.pdf ref the minimum perigee altitude math Delta H , math above the geostationaryorbit is math Delta H 235 mbox km left 1000 C R frac A m right mbox km math where ... 200 km for the GEO protected zone to also permit orbit maneuvers in GEO without interference with the graveyard orbit. Another 35 kilometers tolerance engineering tolerance must be allowed for the effects ..., the Federal Communications Commission FCC requires all geostationary satellites launched after March 18, 2002, to commit to moving to a graveyard orbit at the end of their operational life. ref ... Earth orbit Spacecraft cemetery List of orbits References references orbits Category Satellites Category ... more details
of geosynchronous orbit is the geostationaryorbit popularly, the term geosynchronous may sometimes be used to mean, specifically, geostationary . ref C. D. Brown 1998 , Spacecraft Mission Design, 2nd Edition, AIAA Education Series, p. 81 ref This is a circular geosynchronous orbit at zero inclination , that is, directly above the equator . A satellite in a geostationaryorbit appears stationary ... 398600.4418 km sup 3 sup s sup 2 sup . In the special case of a geostationaryorbit, the ground ... orbit with a non zero inclination or Eccentricity orbit eccentricity , the ground track is a more or less distorted figure eight, returning to the same places once per sidereal day. Geostationaryorbit Main Geostationaryorbit A geostationaryorbit GEO is a circular geosynchronous orbit in the plane .... If one could see a satellite in geostationaryorbit, it would appear to hover at the same ... . Such orbits are useful for telecommunications satellite s. A perfect stable geostationaryorbit ... man to calculate the geostationaryorbit , on which the station would orbit the Earth. Author Arthur C. Clarke is credited with proposing the notion of using a geostationaryorbit for communications ... orbit was Syncom 3 . Geostationary orbits have been in common use ever since, in particular for satellite ... Low Earth orbit Medium Earth orbitGeostationaryorbit Geosynchronous satellite Graveyard orbit ... 2010 A geosynchronous orbit sometimes abbreviated GSO is an orbit around the Earth with an orbital ... of the Earth, an object in geosynchronous orbit returns to the exactly same position in the sky ... traces out a path, typically in the form of an analemma , whose precise characteristics depend on the orbit ... geostationary orbits, or close to geostationary, so that the satellite antenna s that communicate ... the satellite appears. A semisynchronous orbit has an orbital period of 0.5 sidereal day sidereal days ... to go around the Earth twice every day. Examples include the Molniya orbit and the orbits of the satellites ... 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. For synchronous satellites orbiting Earth , this is also known as a geostationaryorbit . 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 .... 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 geostationaryorbit . 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 ... by artificial satellites used for communication, such as geostationary satellites . For natural satellites, which can attain a synchronous orbit only by tidal locking tidally locking their parent ... body becomes tidally locked faster, and by the time a synchronous orbit is achieved, it has had ... orbit Supersynchronous orbit Supersynchronous or Graveyard orbit Synchronous rotation Sun synchronous orbit List of orbits References FS1037C orbits Category Astrodynamics Category Orbits ar ... Orbit sinkron it Orbita sincrona ja no Synkron bane ru simple Synchronous orbit ... more details
to an end, satellites can be moved to a graveyard orbit to keep the geostationary altitude free ...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 geostationaryorbit occurs when an object satellite is placed approximately convert 37,000 km mi abbr on 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 geostationaryorbit 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 to correct inclination and only control eccentricity. This prolongs the life time of the satellite ... de Inclined Orbit fr Orbite inclin e pt rbita inclinada tr E ik y r nge ... more details
An areostationary orbit abbreviated ASO is a circular areosynchronous orbit areo synchronous orbit in the Mars Martian equator equatorial plane about convert 17,000 km mi abbr on above the surface, any point on which revolves about Mars in the same direction and with the same orbital period period as the Martian surface. Although no artificial satellite s have been placed so far in this orbit, it is of interest to some scientists foreseeing a future telecommunications network tele communications network for the exploration of Mars . Areo stationary orbit is a concept similar to Earth s geostationaryorbit geo stationary orbit . The prefix areo derives from Ares , the ancient Greek god of war and counterpart to the Roman god Mars, with whom the planet was identified. The modern Greek word for Mars is ris . See also Areosynchronous orbit List of orbits References reflist External links http marsnet.jpl.nasa.gov elements marsats.html Mars Network Marsats NASA site devoted to future communications infrastructure for Mars exploration http www.lpi.usra.edu meetings robomars pdf 6080.pdf Bandwidth available from an areostationary satellite orbits Category Astrodynamics Category Mars orbits Mars spacecraft stub pdc Areostationary Orbit it Orbita areostazionaria ru ... more details
Areosynchronous orbits are class of synchronous orbit s for artificial satellite s around the planet Mars . As with all synchronous orbits, an areosynchronous orbit has an orbital period equal in length to Mars sidereal day . A satellite in areosynchronous orbit does not necessarily maintain a fixed position in the sky as seen by an observer on the surface of Mars, however such a satellite will return to the same apparent position every Martian day. An areosynchronous orbit that is equatorial in the same plane as the equator of Mars , circular, and prograde rotating about Mars axis in the same direction as the planet s surface is known as an areostationary orbit ASO . To an observer on the surface of Mars, the position of a satellite in ASO would appear to be fixed in a constant position in the sky. The ASO is analogous to a geostationaryorbit GSO about Earth. cn date November 2011 Although no satellites currently occupy areosynchronous or areostationary orbits, some scientists who date November 2011 foresee a future telecommunications network for the exploration of Mars. cn date November 2011 See also Areostationary orbit List of orbits References reflist External links http marsnet.jpl.nasa.gov elements marsats.html Mars Network Marsats NASA site devoted to future communications infrastructure for Mars exploration orbits DEFAULTSORT Areosynchronous Orbit Category Astrodynamics Category Mars orbits Mars spacecraft stub it Orbita areosincrona ru ... more details
No footnotes date April 2009 Deleted image removed Image Sirius orbit Earth.JPG 350px thumb Ground track of three satellite s of the Sirius Satellite Radio constellation in a tundra orbit Image Qzss 45 0.09.jpg 160px thumb Groundtrack of QZSS orbit Tundra orbit is a type of Highly Elliptical Orbit highly elliptical geosynchronous orbit with a high inclination usually near 63.4 and an orbital period of one sidereal day almost 24 hour s . A satellite placed in this orbit spends most of its time over a chosen area of the Earth , a phenomenon known as Apsis apogee dwell. The ground track of a satellite in a tundra orbit is a closed figure eight . These are conceptually similar to Molniya orbit s which have the same inclination but half the period about 12 hours . The only current user of tundra orbits is Sirius Satellite Radio , which operates a satellite constellation constellation of three satellite s. Citation needed date April 2009 The Longitude of the ascending node RAAN and mean anomaly of each satellite is offset by 120 degrees so that when one satellite moves out of position, another has passed perigee and is ready to take over. Tundra and Molniya orbits are used to provide high latitude users with higher elevation angles than a geostationaryorbit. Neither the Tundra nor Molniya orbits are geostationary because that is possible only over the equator, so both orbits are elliptical to reduce the time that the satellite is away from its service area. An argument of perigee of 270 degrees places apogee at the northernmost point of the orbit. An argument of perigee of 90 degrees would likewise serve the high southern latitudes. An argument of perigee of 0 or 180 degrees would cause the satellite to dwell over the equator, but there would be little point to this as this could be better done with a conventional geostationaryorbit. The Tundra and Molniya orbits use a math .... orbits spacecraft stub Category Orbits de Tundra Orbit fr Orbite Toundra tr Tundra y r nge ... more details
Air Force Station , Florida The Geostationary Satellite system GOES , operated by the United States ... 14 was placed in orbit on 7 July 2009, underwent Post Launch Testing until December 2009 and then was placed in on orbit storage at 105 W. ref name GOESstatus cite web title GOES Spacecraft Status Main ... Summary publisher NOAA accessdate 27 December 2011 ref Several GOES satellites are still in orbit, either ... of the communication links between the United States and Amundsen Scott South Pole Station . Geostationary ... is in a parking orbit, currently drifting about 4 W daily. ref cite web url http www.oso.noaa.gov ... ref GOES 10 was decommissioned on December 2, 2009 and was boosted to a graveyard orbit . It no longer ... 2011, was decommissioned on 16 Dec 2011 and was boosted into a graveyard orbit . GOES 15 was moved ... GOES 12 water vapor image. gallery Purpose Designed to operate in geostationaryorbit , 35,790 km 22,240 statute miles above the earth, thereby remaining stationary ... by NASA , while all operations of the satellites once in orbit are done by NOAA . GOES spacecraft ... as GOES 14 once it successfully arrived on orbit. GOES 14 GOES 14 will be stored and will be able ... will build and launch a GOES Q only if either GOES O or GOES P fails to be delivered on orbit in good ..., S. M. Musko, Steve title Prototype development of a Geostationary Synthetic Thinned Aperture Radiometer ... X Ray Sensor XRS , and the Extreme Ultraviolet Sensor EUVS the Geostationary Lightning Mapper ... title GOES R Spacecraft work Geostationary Operational Environmental Satellite Program GOES ... Benefiting Users work Geostationary Operational Environmental Satellite Program GOES publisher NOAA ... on April 28, 1983, decommissioned GOES G , launched on May 3, 1986, failed to orbit GOES 7 , launched ... as GOES East ref name GOESstatus GOES 14 , launched on June 27, 2009, on orbit in storage ... in geosynchronous orbit Category National Weather Service Category Lockheed Martin satellites ... more details
For Earth orbit, see Geostationaryorbit . 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 Earth orbit Around the Earth , stationary satellites orbit at altitudes of approximately convert 22,300 mi km . ref name ST Writing in 1945, the science fiction author Arthur C. Clarke imagined communications satellite s as travelling in stationary orbits, where those satellites would travel around 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 ... an even, circular orbit at the 22,300 mile altitude. ref name ST References Reflist Category ... more details
The Geostationary Earth Radiation Budget GERB is an instrument aboard EUMETSAT s Meteosat Second Generation geostationary satellite s designed to make accurate measurements of the Earth Radiation Budget . It was produced by a European consortium consisting of the United Kingdom , Belgium and Italy . The first, known as GERB 2, was launched on 28 August 2002 on an Ariane 5 rocket. The second, GERB 1, was launched on 21 December 2005. External links http www.ssd.rl.ac.uk gerb GERB http gerb.oma.be GERB at RMIB References Harries et al., The Geostationary Earth Radiation Budget Project , Bulletin of American Met. Soc. V86 p948, July 2005. Category Spacecraft instruments US spacecraft stub ... more details
place for the final burn is often in the southern hemisphere. For geostationaryorbit missions, the correct ... 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 Design author Charles D. Brown , http books.google.com books?id vpilMLP7OHQC&pg PA83&dq 22parking orbit 22 restart equatorial page 83 . ref For Apollo program manned lunar missions , a parking orbit allowed some checkout while ... restart is not needed, and the penalty is small for their typical Geostationary transfer orbit GTO ...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. image Ranger Parking Orbit en.svg thumb upright 3 Parking orbit for one of the early ... orbit may be used 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 often ... Earth orbit LEO missions, the desired location for the final burn may not be in a convenient spot. In particular ... 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 usage of an inclination ... program used parking orbits, for all the reasons mentioned above except those that pertain to geostationary ... url http history.nasa.gov ap08fj 02earth orbit tli.htm title Apollo Flight Journal Apollo 8, Day 1 Earth Orbit and Translunar Injection publisher NASA ref The Space Shuttle missions to the International ... Low Earth orbit , where parking orbits are not much help the shuttle did not have multiple restart ... more details
orbit than into a geostationaryorbit. Disadvantages are that as opposed to a spacecraft in a geostationaryorbit the ground station needs a steerable antenna to track the spacecraft and that the spacecraft ... Figure 1 The Molniya orbit. Usually the period from perigee 2 hours to perigee 10 hours is used to transmit to the northern hemisphere Molniya orbit is a type of highly elliptical orbit with an inclination ... s which have been using this type of orbit since the mid 1960s. A satellite in a highly eccentric orbit spends most of its time in the neighborhood of apogee which for a Molniya orbit is over the northern ... of Molniya orbit. In the operational part of the orbit from apogee 3 hours to apogee 3 hours the satellite ... orbit. At apogee the green illumination zone applies, three hours before or after apogee the red ... Em4.svg thumb Figure 3 View of the Earth four hours before apogee from a Molniya orbit under the assumption ... from the apogee of a Molniya orbit under the assumption that the longitude of the apogee is 90 E. The spacecraft ... Ep4.svg thumb Figure 5 View of the Earth four hours after apogee from a Molniya orbit under the assumption ... hours before apogee from a Molniya orbit under the assumption that the longitude of the apogee is 90 ... earth view W.svg thumb Figure 7 View of the Earth from the apogee of a Molniya orbit under the assumption ... after apogee from a Molniya orbit under the assumption that the longitude of the apogee is 90 W ..., and Russia in particular, is located at high latitudes. To broadcast to these latitudes from a geostationaryorbit would require considerable power due to the low Angle of incidence elevation angles . A satellite in a Molniya orbit is better suited to communications in these regions because it looks ... for periods of eight hours per orbit centered at apogee as illustrated in figure 9. As the Earth rotates ... this expenditure of fuel, the Molniya orbit uses an inclination of 63.4 , for which these perturbations ... are equations 24 and 28 of the article Orbital perturbation analysis spacecraft For a Molniya orbit ... more details
Orphan date February 2009 The Geostationary Banana Over Texas project was a plan to launch a banana shaped airship over the state of Texas in August 2008. It is unclear whether the plan was a Hoax hoax of exposure . Overview Cesar Saez, an Argentina Argentinian public artist living in Quebec , Canada , at the time, initially said he planned to create the project using Canadian taxpayer funds. But Saez later stated, One thing I love is the issue of truth or hoax, and I love the ambiguity. ref cite news title Flying banana may reach new artistic heights first John last MacCormack work San Antonio Express News date Jan. 7, 2007 url http www.chron.com disp story.mpl bizarre 4452214.html accessdate Apr. 21, 2010 ref The project received at least 148,000 Canadian dollars approx. 140,000 US in grants from the Government of Canada Canadian Federal Government and Quebec Province, sparking controversy. ref cite news url http www.ctv.ca servlet ArticleNews story CTVNews 20070110 giant banana 070110 20070110 title Artist hopes to float giant banana over Texas date Jan. 10 2007 publisher CTV.ca ref As of 2010, Saez had accepted the funds and left Canada without producing any tangible results for the two years of payment. ref cite news title Bananas Over Bush first Mark last Steyn newspaper National Review date Feb. 4, 2010 url http corner.nationalreview.com post ?q NTIxMDZjYzQ2NjA5MjNkYjU2Njg1MDkxZjQyOGUwZTk accessdate Apr. 21, 2010 ref However, the plan is still listed as the current project on the artist s website. ref cite web url http www.cesarsaez.com English CESAR SAEZ.html title cesarsaez.com author date work publisher quote For current project see web page Geostationary Banana Over Texas accessdate Apr. 21, 2010 ref References reflist External links http www.geostationarybananaovertexas.com en.html Official project website Category Hoaxes in Canada Category 2008 in Canada Category 2008 hoaxes ru ... more details
Unreferenced date December 2009 For other meanings of the term orbit , see orbit disambiguation A circular orbit is the orbit at a fixed distance around any point by an object rotation around a fixed axis rotating around a fixed axis . Below we consider a circular orbit in astrodynamics or celestial mechanics under standard assumptions. Here the centripetal force is the gravitational force, and the axis mentioned above is the line through the center of the central mass perpendicular to the plane of motion. In this case not only the distance, but also the speed, angular speed, potential and kinetic energy are constant. There is no periapsis or apoapsis. This orbit has no radial version. Circular ... gravitational parameter . Equation of motion The orbit equation in polar coordinates, which in general ... period in a circular orbit and the time to fall to a point mass in a radial parabolic orbit math T par frac sqrt 2 3 sqrt r 3 over mu math 7.5 of the orbital period in a circular orbit The fact ... the speed in a circular orbit at that distance the kinetic energy is twice as much, hence the total energy is zero. Delta v to reach a circular orbit Maneuvering into a large circular orbit, e.g. a geostationaryorbit , requires a larger delta v than an escape orbit , although the latter implies ... orbit. It is also a matter of maneuvering into the orbit. See also Hohmann transfer orbit . Orbital velocity in general relativity In Schwarzschild metric , the orbital velocity for a circular orbit ... . The four velocity of a body on a circular orbit is given by math u mu dot t , 0, 0, dot phi math math scriptstyle r math is constant on a circular orbit, and the coordinates can be chosen so that math ... v sqrt frac M r 2M math Or, in SI units math v sqrt frac GM r r S math See also Elliptic orbit List of orbits Two body problem Orbits DEFAULTSORT Circular Orbit Category Astrodynamics Category Orbits fr Orbite circulaire it Orbita circolare ms Orbit bulat ja tr Dairesel y r nge ... more details
wiktionarypar orbit TOCright Orbit is the gravitationally curved path of one object around a point or another body. Orbit may also refer to Computing ORBit , an object request broker ORB for CORBA Orbit Downloader , a download manager for Windows Science and mathematics Orbit anatomy , the socket in the skull which accommodates an eye Orbit dynamics , in dynamical systems Orbit group theory or symmetry orbitOrbit control theory , a particular case of the notion of orbit in group theory People William Orbit , atmospheric techno composer Popular culture Orbit Books , a UK based publisher of science fiction books and fantasy books Orbit Magazine , a Detroit based alternative publication Orbit band Orbit anthology series Orbit anthology series , a series of original science fiction anthologies, published between 1966&ndash 1980 Orbit Science Fiction , a five issue science fiction anthology series, published between 1953&ndash 1954 Orbit album Orbit album , the first album from William OrbitOrbit, a fictional Microsoft Flight Simulator X Airlines airline in Flight Simulator X Organizations Orbit Group , a UK housing association Orbit Communications Company , a former DBS satellite service in the Middle East Orbit Irrigation Products Other Orbit gum , a brand of chewing gum manufactured by the Wrigley Company Orbit mascot , the former mascot of Major League Baseball s Houston Astros Orbit scratch , is a DJ technique ArcelorMittal Orbit , a planned steel tower to be located in East London as part of the London 2012 Olympic Park See also Orbital disambiguation Lookfrom Orbit Intitle Orbit disambig zh min nan K i t bg da Bane de Orbit es rbita desambiguaci n fr Orbite homonymie ko io Orbito homonimo ja pl Orbita ujednoznacznienie pt rbita desambigua o ro Orbit ru tl Orbito tr Y r nge anlam ayr m zh ... 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
A heliocentric orbit also called circumsolar orbit is an orbit around the Sun . All planet s, comet s, and asteroid s in our Solar System are in such orbits, as are many artificial Space probe probes and pieces of Space debris debris . The moons of planets in the Solar System, by contrast, are not in heliocentric orbits as they orbit their respective planet. 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 . While it is convenient to think of orbits around the Sun, bodies in the Solar System do not actually orbit the Sun. Instead, all bodies in the Solar System including the Sun actually orbit the barycenter of the Solar System. A similar phenomenon allows the detection of extrasolar planets by way of the radial velocity method . 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 orbits sun stub Category 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 no Heliosentrisk bane pl Orbita heliocentryczna pt rbita helioc ntrica ru sk Heliocentrick dr ha sv Heliocentrisk bana tr G ne merkezli y r nge uk zh ... more details
Unreferenced date December 2009 Orphan date October 2008 Chip and Orbit is a children s television program starring two animated robot s in five minute long episode s. DEFAULTSORT Chip And Orbit Category Children s television series Child tv prog stub ... more details
In stellar dynamics a box orbit refers to a particular type of orbit which can be seen in triaxial systems, that is, systems which do not possess a symmetry around any of its Coordinate axis axes . They contrast with the loop orbit s which are observed in spherically symmetric or axisymmetric systems. In a box orbit, the star oscillates independently along the three different axes as it moves through the system. As a result of this motion, it fills in a roughly box shaped region of space. Unlike loop orbits, the stars on box orbits can come arbitrarily close to the center of the system. As a special case, if the frequencies of oscillation in different directions are commensurability mathematics commensurate , the orbit will lie on a one or two dimensional manifold and can avoid the center. ref Citation last Merritt first D. author link David Merritt last2 Valluri first2 M. title Resonant Orbits in Triaxial Galaxies journal The Astronomical Journal volume 118 pages 1177 1189 date September 1999 year 1999 arxiv astro ph 9903452 bibcode 1999AJ....118.1177M doi 10.1086 301012 ref Such orbits are sometimes called boxlet s . border 0 cellpadding 2 align center Examples of box orbits in 2 dimensions Image Box orbit begin.svg 220px Beginning of a box orbit Image Box orbit full.svg 220px Many cycles of a box orbit Image Box orbit resonance.svg 220px A closed box orbit align center Beginning of a box orbit align center Many cycles of a box orbit align center A closed box orbit References reflist See also Horseshoe orbit Lissajous curves List of orbits Category Orbits orbits zh ... more details
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