Help


[permalink] [id link]
+
Page "Orbital station-keeping" ¶ 2
from Wikipedia
Edit
Promote Demote Fragment Fix

Some Related Sentences

For and geostationary
For instance it is the most common way to transfer satellites into geostationary orbit, after first being " parked " in low earth orbit.
For example, for ground stations at latitudes of φ = ± 45 ° on the same meridian as the satellite, the time taken for a signal to pass from Earth to the satellite and back again can be computed using the cosine rule, given the geostationary orbital radius r ( derived below ), the Earth's radius R and the speed of light c, as
For synchronous satellites orbiting Earth, this is also known as a geostationary orbit.
For areas close to the North ( and South ) Pole, a geostationary satellite may appear below the horizon.
For the geostationary transfer orbit we have
For comparison, geostationary satellites orbit Earth at 35, 790 km.
For geostationary spacecraft the eccentricity must be kept sufficiently small for a spacecraft to be tracked with a non-steerable antenna.
For geostationary spacecraft thruster burns orthogonal to the orbital plane must be executed to compensate for the effect of the lunar / solar gravitation that perturbs the orbit pole with typically 0. 85 degrees per year.
For satellites in geostationary orbit and geosynchronous orbits, the graveyard orbit is a few hundred kilometers above the operational orbit.

For and spacecraft
For astrodynamics reasons, cheap spacecraft travel to other planets is only practical within certain time windows.
For instance, the motion of a spacecraft, regarding its orbit and attitude ( rotation ), is described by the relativistic theory of classical mechanics, while the analogous movements of an atomic nucleus are described by quantum mechanics.
For instance, if limited onboard power fed to its engine was the dominant limitation on how much payload a hypothetical spacecraft could shuttle ( such as if intrinsic propellant economic cost was minor from usage of extraterrestrial soil or ice ), ideal exhaust velocity would rather be around 62. 75 % of total mission delta v if operating at constant specific impulse, except greater optimization could come from varying exhaust velocity during the mission profile ( as possible with some thruster types, including mass drivers and variable specific impulse magnetoplasma rockets ).
For example, a ramjet might collect 1 gram of incoming ions per second from interstellar space beyond the heliopause, at a velocity of 50 km / s relative to the ramjet driven spacecraft.
For orbital spaceflights, spacecraft enter closed orbits around the Earth or around other celestial bodies.
For spacecraft near the Sun, solar panels are frequently used to generate electrical power.
For missions beyond low Earth orbit NASA is building the Space Launch System and the Orion spacecraft.
For the Mercury, Gemini, and Apollo spacecraft, such communications blackouts lasted for several minutes.
For the Apollo 13 mission, the blackout was much longer than normal because the flight path of the spacecraft was unexpectedly at a much shallower angle than normal.
For a rocket the payload can be a spacecraft launched with the rocket, or in the case of a ballistic missile, the warheads.
For spacecraft carrying instruments for which an altitude of 36000 km is suitable the Geostationary orbit is sometimes the preferred choice.
For example, nuclear pulse propulsion is a form of spacecraft propulsion that would use nuclear explosives to provide impulse to a spacecraft.
* For communications between spacecraft, including elements of a satellite constellation
For Salyut, small modifications had to be made to the docking port of the OPS to accommodate Soyuz spacecraft in addition to TKS spacecraft.
For this reason, reaction wheels are often used to aim spacecraft with cameras or telescopes.
For launches above low Earth orbit ( LEO ), the actual launch time can be somewhat flexible if a parking orbit is used, because the inclination and time the spacecraft initially spends in the parking orbit can be varied.
For example, consider a spacecraft travelling from the Earth to Mars.
For example, the capacity ( separated spacecraft mass ) of the Delta IV Heavy:
For example, if two spacecraft are in the same circular orbit and wish to dock, unless they are very close, the trailing craft cannot simply fire its engines to go faster.
For example, a dish antenna on a spacecraft is a high-gain device that must be pointed at the planet to be effective, whereas a typical Wi-Fi antenna in a laptop computer is low-gain, and as long as the base station is within range, the antenna can be in any orientation in space.
For communicating with the Deep Space Network, the spacecraft transmitted data across the x-band using a 0. 6-meter parabolic high-gain antenna, medium-gain antenna ( MGA ) and low-gain antennas ( LGA ) depending on mission phase, and a 15-watt transponder design originally intended for the Cassini spacecraft.
For storing data when the spacecraft was unable to communicate with Earth, the processor card was able to store 128-megabytes, 20 % of which was occupied by the flight system software.

For and inclination
For various reasons, however, poverty and personal inclination among others, he did not take a prominent part in the military operations of this period.
For practical purposes the plane of the equator and the plane of the ecliptic maintain a constant inclination to each other of approximately 23. 5 °.
For the Moon, measuring its inclination with respect to Earth's equatorial plane leads to a rapidly varying quantity and it makes more sense to measure it with respect to the ecliptic ( i. e. the plane of the orbit that Earth and Moon track together around the Sun ), a fairly constant quantity.
* For planets and other rotating celestial bodies, the angle of the axis of rotation with respect to the normal to plane of the orbit is sometimes also called inclination or axial inclination, but to avoid ambiguity can be called axial tilt or obliquity.
For Christians, concupiscence refers to what they understand as the orientation, inclination or innate tendency of human beings to long for fleshly appetites, often associated with a desire to do things which are proscribed.
For a typical GTO with a semimajor axis of 24, 582 km, perigee velocity is 9. 88 km / s and apogee velocity is 1. 64 km / s, clearly making the inclination change far less costly at apogee.
For as the nature of foul weather lieth not in a shower or two of rain but in an inclination thereto of many days together, so the nature of war consisteth not in actual fighting but in the known disposition thereto during all the time there is no assurance to the contrary.
For Derrida, the foundation of ethics is hospitality, the readiness and the inclination to welcome the Other into one's home.
For a Molniya orbit the inclination is selected such that as given by the formula above is zero but as given by the other equation will be − 0. 0742 ° per orbit.
For tonal languages such as Thai, the tone is indicated by inclination and movement of the hand.
For sun-synchronous orbit the precession of the orbital plane caused by the oblateness of the Earth is a desirable feature that is part of the mission design but the inclination change caused by the gravitational forces of Sun / Moon is undesirable.
For Sun-synchronous spacecraft having a constant geometry relative to the Sun the inclination change due to the solar gravitation is particularly large, a delta-v in the order of 1-2 m / s per year can be needed to keep the inclination constant.
For the most efficient example mentioned above, targeting an inclination at apoapsis also changes the argument of periapsis.
For more complicated manoeuvres which may involve a combination of change in inclination and orbital radius, the amount of delta v is the vector difference between the velocity vectors of the initial orbit and the desired orbit at the transfer point.
For symmetric lines, halfwidth, and full inclination width
For a good groundwave propagation, mast radiators should be built always on a large flat area with good ground conductivity and if possible without inclination.
For a nearby star with a small orbital velocity ( or whose orbital plane was almost perpendicular to our line of view ) this might merely make the star's orbit seem erratic, but for a sufficient combination of orbital speed and distance ( and inclination ), the " fast " light given off during approach would be able to catch up with and even overtake " slow " light emitted earlier during a recessional part of the star's orbit, and the star would present an image that was scrambled and out of sequence.
For Vattimo it is only when hermeneutics accepts its nihilistic destiny that " it can find in ‘ negativity ,’ in dissolution as the ‘ destiny of Being ’ … the orientating principle that enables it to realize its own original inclination for ethics whilst neither restoring metaphysics nor surrendering to the futility of a relativistic philosophy of culture " ( 1992: 119 ).

0.388 seconds.