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Speed at which a body orbits around the barycenter of a system
instantaneous orbital speed at a given point of the orbit can be computed from its distance to the central body and the object's specific orbital energy, sometimes
Orbital_speed
Trajectory of Earth around the Sun
eastward per solar day (or a Sun or Moon diameter every 12 hours). Earth's orbital speed averages 29.78 km/s (18.50 mi/s; 107,208.00 km/h; 66,615.96 mph), which
Earth's_orbit
Conceptual artificial ring around the Earth
the Earth, the required speed is on the order of 10 km/sec,[citation needed] compared to a typical low Earth orbit orbital speed of 7.9 km/sec. The structure
Orbital_ring
Curved path of an object around a point
mechanics, an orbit is the curved trajectory of an object under the influence of an attracting force. Alternatively, it is known as an orbital revolution
Orbit
Spaceflight where spacecraft orbits an astronomical body
An orbital spaceflight (or orbital flight) is a spaceflight in which a spacecraft is placed on a trajectory where it could remain in space for at least
Orbital_spaceflight
Circular orbit above Earth's Equator and following the direction of Earth's rotation
35,786 kilometres (22,236 miles). The orbital speed is calculated by multiplying the angular speed by the orbital radius: v = ω r ≈ 3074.6 m/s {\displaystyle
Geostationary_orbit
Orbit around Earth
to drag from the Earth's atmosphere, which decreases the orbital altitude. The rate of orbital decay depends on the satellite's cross-sectional area and
Geocentric_orbit
Orbit with a fixed distance from the barycenter
} is the orbital velocity of the orbiting body, r {\displaystyle r\,} is radius of the circle ω {\displaystyle \omega \ } is angular speed, measured
Circular_orbit
Kepler orbit with an eccentricity of less than one
{\displaystyle (m_{2})} , the orbital speed ( v {\displaystyle v\,} ) of one body traveling along an elliptical orbit can be computed from the vis-viva
Elliptic_orbit
Spacecraft end-of-life orbit
Orbital periods and speeds are calculated using the relations 4π2R3 = T2GM and V2R = GM, where R is the radius of orbit in metres; T is the orbital period
Graveyard_orbit
The Moon's circuit around Earth
900 miles) from Earth's centre (about 73% of its radius). With a mean orbital speed around the barycentre of 1.022 km/s (2,290 mph), the Moon covers a distance
Orbit_of_the_Moon
Earth-centered orbit above low Earth orbit and below geostationary orbit
where R is the radius of orbit in metres; T is the orbital period in seconds; V is the orbital speed in m/s; G is the gravitational constant, approximately
Medium_Earth_orbit
Disked object that eclipsed V1400 Centauri
This orbital speed allows for a range of possible orbital periods depending on J1407b's orbital eccentricity: if J1407b has a circular orbit with a
J1407b
Amount by which an orbit deviates from a perfect circle
astrodynamics, the orbital eccentricity of an astronomical object is a dimensionless parameter that determines the amount by which its orbit around another
Orbital_eccentricity
Transfer manoeuvre between two orbits
astronautics, the Hohmann transfer orbit (/ˈhoʊmən/) is an orbital maneuver used to transfer a spacecraft between two orbits of different altitudes around
Hohmann_transfer_orbit
Type of orbit around an astronomical body
spaceports as they provide some additional orbital speed to the launch vehicle by imparting the rotational speed of the Earth, 460 m/s, to the spacecraft
Near-equatorial_orbit
and V2R = GM, where R = radius of orbit in metres, T = orbital period in seconds, V = orbital speed in m/s, G = gravitational constant ≈ 6.673×10−11 Nm2/kg2
List_of_orbits
1676 demonstration of light's finite speed by Danish astronomer Ole Rømer
ratio c⁄v, where c is the speed of light and v is the Earth's orbital velocity (strictly, the component of the Earth's orbital velocity parallel to the
Rømer's determination of the speed of light
Rømer's_determination_of_the_speed_of_light
Parameters that define a specific orbit
Orbital elements are the parameters required to uniquely identify a specific orbit. In celestial mechanics these elements are considered in two-body systems
Orbital_elements
Field of classical mechanics concerned with the motion of spacecraft
planets, moons, and comets. Orbital mechanics focuses on spacecraft trajectories, including orbital maneuvers, orbital plane changes, and interplanetary
Orbital_mechanics
Concept in celestial mechanics
mechanics, escape velocity or escape speed is the minimum speed needed for an object to escape from contact with or orbit of a primary body, assuming: Ballistic
Escape_velocity
Orbit keeping the satellite at a fixed longitude above the equator
A geosynchronous orbit (sometimes abbreviated GEO) is an Earth-centered orbit with an orbital period that matches Earth's rotation on its axis, 23 hours
Geosynchronous_orbit
Type of geocentric orbit
surface. Even if an orbit remains Sun-synchronous, however, other orbital parameters such as argument of periapsis and the orbital eccentricity evolve
Sun-synchronous_orbit
Mathematical equation describing the motion of a rocket
determined by the rocket motor's design, the desired delta-v (e.g., orbital speed or escape velocity), and a given dry mass m f {\displaystyle m_{f}}
Tsiolkovsky_rocket_equation
Parameter in the gravitational two-body problem
that, for any other position, the orbital speed. For an elliptic orbit the rate of change of the specific orbital energy with respect to a change in
Specific_orbital_energy
Table of positions of astronomical objects at given times
Concerning the size and shape of an orbit Nautical almanac – Publication on celestial body positions Osculating orbit – Orbital perturbations Ptolemy's table
Ephemeris
Angle between a reference plane and the plane of an orbit
Orbital inclination measures the tilt of an object's orbit around a celestial body. It is expressed as the angle between a reference plane and the orbital
Orbital_inclination
Type of co-orbital motion of a small orbiting body relative to a larger orbiting body
horseshoe orbit of (419624) 2010 SO16 around the Earth-Sun system over 900 years In celestial mechanics, a horseshoe orbit is a type of co-orbital motion
Horseshoe_orbit
Martian orbit around the Sun
Sun in 687 days and travels 9.55 AU in doing so, making the average orbital speed 24 km/s. The eccentricity is greater than that of any other planet except
Orbit_of_Mars
Spaceflight where the spacecraft does not go into orbit
considered a sub-orbital spaceflight. Some sub-orbital flights have been undertaken to test spacecraft and launch vehicles later intended for orbital spaceflight
Sub-orbital_spaceflight
Magnitude of velocity
kinematics, the speed of a moving object is the rate at which the distance travelled by the object changes with time. The average speed of an object in
Speed
Term in geometry; longest and shortest semidiameters of an ellipse
barycentric orbital speed is 1.010 km/s, whilst the Earth's is 0.012 km/s. The total of these speeds gives a geocentric lunar average orbital speed of 1.022 km/s;
Semi-major and semi-minor axes
Semi-major_and_semi-minor_axes
Type of spacecraft maneuver
a spacecraft to burn its fuel is at the lowest possible orbital periapsis, when its orbital velocity (and so, its kinetic energy) is greatest. In some
Oberth_effect
Proposed momentum exchange tether
Earth orbit, which rotates in its orbital plane and whose ends brush the upper Earth atmosphere, with the rotational motion cancelling the orbital motion
Skyhook_(structure)
Void between celestial bodies
low Earth orbit, orbital speed is about 7.8 km/s (17,400 mph); by contrast, the fastest piloted airplane speed ever achieved (excluding speeds achieved
Outer_space
Spaceflight operation
satellite. An orbiter is a spacecraft designed for orbital insertion. An orbit insertion maneuver involves either deceleration from a speed in excess of
Orbit_insertion
Astrodynamic equation
Kepler's first law Circular orbit Elliptic orbit Parabolic trajectory Hyperbolic trajectory Tsiolkovsky rocket equation Orbital speed Escape velocity Celestial
Orbit_equation
Orbit around Earth between 160 and 2000 km
Earth's radius). Objects in orbits that pass through this zone, even if they have an apogee further out or are sub-orbital, are carefully tracked since
Low_Earth_orbit
Hot Jupiter exoplanet in the constellation Vulpecula
Jupiter and a radius 11.4% greater, HD 189733 b orbits its host star once every 2.2 days at an orbital speed of 152.0 kilometers per second (340,000 miles
HD_189733_b
Movement during spaceflight
In spaceflight, an orbital maneuver (otherwise known as a burn) is the use of propulsion systems to change the orbit of a spacecraft. For spacecraft far
Orbital_maneuver
Concept in astrodynamics
Orbital Mechanics & Astrodynamics by Bryan Weber: https://orbital-mechanics.space/the-orbit-equation/hyperbolic-trajectories.html Trajectories Orbits
Hyperbolic_trajectory
Type of orbit
{\displaystyle v_{o}} is orbital velocity of a body in circular orbit. For a body moving along this kind of trajectory the orbital equation is: r = h 2 μ
Parabolic_trajectory
Concept in celestial mechanics
is the orbit radius, v is the orbital speed, ω is the angular speed, and T is the orbital period. This can be generalized for elliptic orbits: μ = 4 π
Standard gravitational parameter
Standard_gravitational_parameter
Proposed type of space transportation system
Earth, reaching low orbital speed at a point approximately 66 percent of the height between the surface and geostationary orbit, or a height of about
Space_elevator
Periodic, three-dimensional orbit
Halo orbit A halo orbit is a periodic, non-planar orbit associated with one of the L1, L2 or L3 Lagrange points in the three-body problem of orbital mechanics
Halo_orbit
Flight into or through outer space
mission is orbital, the spacecraft usually separates the first stage and ignites the second stage, which propels the spacecraft to high enough speeds that it
Spaceflight
First planet from the Sun
angular orbital velocity equals its angular rotational velocity so that the Sun's apparent motion ceases; closer to perihelion, Mercury's angular orbital velocity
Mercury_(planet)
Observed discrepancy in galactic angular momenta
curve of a disc galaxy (also called a velocity curve) is a plot of the orbital speeds of visible stars or gas in that galaxy versus their radial distance
Galaxy_rotation_curve
Transfer orbit used to reach geosynchronous or geostationary orbit
cost to send a spacecraft to such orbits is very high due to their high orbital radius. A GTO is an intermediary orbit used to make this process more efficient
Geostationary_transfer_orbit
Astronomical phenomenon time
sunset vary by a few days. This is because Earth orbits the Sun in an ellipse, and its orbital speed varies slightly during the year. There is evidence
Summer_solstice
Jet engine where combustion takes place in supersonic airflow
between half of orbital speed and orbital speed (X-30 research suggested that Mach 17 might be the limit compared to an orbital speed of Mach 25, and
Scramjet
Path on the surface of the Earth or another body directly below an aircraft or satellite
As the orbital period of a satellite increases, approaching the rotational period of the Earth (in other words, as its average orbital speed slows towards
Satellite_ground_track
Time an astronomical object takes to complete one orbit around another object
reciprocal is the orbital frequency, a kind of revolution frequency, in units of hertz. According to Kepler's Third Law, the orbital period T of two point
Orbital_period
Estimate of total change in velocity of a space mission
energy/high speed multiplies the effect of a burn. Thus for example the delta-v for a Hohmann transfer from Earth's orbital radius to Mars's orbital radius
Delta-v_budget
Halley-type comet and parent body of the Perseid meteors
a large periodic comet with a 1995 (osculating) orbital period of 133 years that is in a 1:11 orbital resonance with Jupiter. It fits the classical definition
Comet_Swift–Tuttle
Satellite orbit with high inclination
orbit to provide telecommunications services. Near-polar orbiting satellites commonly choose a sun-synchronous orbit, where each successive orbital pass
Polar_orbit
Movement around a celestial body that remains below its Karman line
causing rapid orbital decay if left unchecked. A number of artificial satellites have been placed into transatmospheric Earth orbits, usually due to
Transatmospheric_orbit
Most common type of rocket, used to launch satellites
separate the two vehicles. Only multistage rockets have reached orbital speed. Single-stage-to-orbit designs are sought, but have not yet been demonstrated on
Multistage_rocket
Measure of amount of effort to change trajectory
landing on a planet or moon, or an in-space orbital maneuver. It is a scalar that has the units of speed. As used in this context, it is not the same
Delta-v
Orbit of an astronomical body equal to that body's average rotational period
radius of orbit By this formula, one can find the synchronous orbital radius of a body, given its mass and sidereal rotational period. Orbital speed (how fast
Synchronous_orbit
Natural phenomenon wherein the Earth casts a shadow on the Moon
its orbit, its orbital speed is the slowest. The diameter of Earth's umbra does not decrease appreciably within the changes in the Moon's orbital distance
Lunar_eclipse
radius r: √(2Gm)/r. ^ Orbital speed is calculated using the mean orbital radius and the orbital period, assuming a circular orbit. ^ Assuming a density
List of gravitationally rounded objects of the Solar System
List_of_gravitationally_rounded_objects_of_the_Solar_System
Crewed or uncrewed travel between stars or planets
accelerating spacecraft beyond orbital speed, reaching escape velocity relative to Earth at 11.2 km/s, entering heliocentric orbit, possibly accelerating further
Interplanetary_spaceflight
Quasi-periodic orbital trajectory
trajectory In orbital mechanics, a Lissajous orbit (pronounced [li.sa.ʒu]), named after Jules Antoine Lissajous, is a quasi-periodic orbital trajectory that
Lissajous_orbit
Orbit around the barycenter of the Sun
heliocentric orbit (also called circumsolar orbit) is an orbit around the Sun. The inner planets are mainly influenced by the Sun's gravity, and orbit points
Heliocentric_orbit
System for specifying positions of celestial objects
standard celestial reference system and frame Orbital elements – Parameters that define a specific orbit Planetary coordinate system – Coordinate system
Astronomical coordinate systems
Astronomical_coordinate_systems
Type of high-latitude satellite orbit
It is a highly elliptical orbit with an inclination of 63.4 degrees, an argument of perigee of 270 degrees, and an orbital period of about half a sidereal
Molniya_orbit
Either of two extreme points in a celestial object's orbit
the seasons: because Earth's orbital speed is minimum at aphelion and maximum at perihelion, the planet takes longer to orbit from June solstice to September
Apsis
periapsis ω (measured on orbital plane): ϖ = Ω + ω {\displaystyle \varpi =\Omega +\omega } which are derived from the orbital state vectors. Define the
Longitude_of_periapsis
Defining the orbit of an object in space
towards the positive x-axis. Equinox Kepler orbits List of orbits Orbital node Perturbation of the orbital plane can cause precession of the ascending
Longitude of the ascending node
Longitude_of_the_ascending_node
Kind of planetary orbit
synchronous orbit has a period equal to the rotational period of the body which contains the barycenter of the orbit. One particular supersynchronous orbital regime
Supersynchronous_orbit
54 au (679,000,000 km; 422,000,000 mi) in doing so, giving an average orbital speed of 35 km/s (78,000 mph). When the geocentric ecliptic longitude of Venus
Orbit_of_Venus
Situation in which an astronomical object's orbital period matches its rotational period
is locked to its own orbit around the Sun in a 3:2 resonance. This results in the rotation speed roughly matching the orbital speed around perihelion. Many
Tidal_locking
Periodic, three-dimensional orbit
In orbital mechanics a near-rectilinear halo orbit (NRHO) is a halo orbit that passes close to the smaller of two bodies and has nearly stable behavior
Near-rectilinear_halo_orbit
Geocentric orbit with an altitude entirely above that of a geosynchronous orbit
A high Earth orbit is a geocentric orbit with an apogee farther than that of the geosynchronous orbit, which is 35,786 km (22,236 mi) away from Earth.
High_Earth_orbit
Monty Python song by Eric Idle and John Du Prez
nautical miles is accurate to two significant figures. Idle gives Earth's orbital speed as 19 miles (31 km) per second, which is accurate to two significant
Galaxy_Song
Sixth planet from the Sun
less than a third of its mass. Saturn orbits the Sun at a distance of 9.59 AU (1,434 million km), with an orbital period of 29.45 years. Saturn's interior
Saturn
Long-period comet
to the comet. It has the longest known orbital period of any periodic comet (366.51 years). Its orbital speed around the Sun varies from 59 km/s (37 mi/s)
153P/Ikeya–Zhang
Motion of a body subject only to gravity
Moon is thus in free fall around the Earth, though its orbital speed keeps it in very far orbit from the Earth's surface. In a roughly uniform gravitational
Free_fall
Orbit of an object around the Moon
that make most unstable, and leave only a few orbital trajectories possible for indefinite frozen orbits. These would be useful for long-term stays in
Lunar_orbit
Galaxy containing the Solar System
the outer edge of the Milky Way. Because the orbital velocity depends on the total mass inside the orbital radius, this suggests that the Milky Way is
Milky_Way
Smallest stable circular orbit of a particle
practical terms in artificial satellite orbits; in geostationary orbit at 35,786 kilometres (22,236 mi) the orbital speed is 10,800 kilometres per hour (6,700 mph)
Innermost stable circular orbit
Innermost_stable_circular_orbit
Range of low orbital altitudes
highly elliptical orbit around Earth with a perigee as low as 80 to 90 km (50 to 56 mi), surviving for multiple orbits. Sub-orbital flight and near space
Very_low_Earth_orbit
a particular altitude where the orbital speed almost matches the rotation below, in an equatorial orbit. As the speed decreases slowly, then an additional
Stationary_orbit
Cartesian vectors of position and velocity of an orbiting body in space
In astrodynamics and celestial dynamics, the orbital state vectors (sometimes state vectors) of an orbit are Cartesian vectors of position ( r {\displaystyle
Orbital_state_vectors
Parameter of Keplerian orbits
ν by 2π − ν) where: v is the orbital velocity vector of the orbiting body, e is the eccentricity vector, r is the orbital position vector (segment FP in
True_anomaly
Chinese modular space station (since 2021)
mission. Tiangong is the first crewed spacecraft to use ion thrusters, for orbital station-keeping, while communications are relayed through the Tianlian
Tiangong_space_station
Apparent backward motion of a planet
however, Deimos has an orbital period of 1.23 Martian sidereal days, making it supersynchronous, whereas Phobos has an orbital period of 0.31 Martian
Apparent_retrograde_motion
Natural phenomenon due to which tidal locking occurs
and higher orbital velocity and a shorter and shorter orbital period, until a final collision with the primary. See subsynchronous orbit. The naming
Tidal_acceleration
1842 treatise by Christian Doppler
minutes, an orbit diameter of 80000 km, and an orbital speed of more than 1000 km/s. RX J0806.3+1527 At present, the highest radial speed of nearby single
On the coloured light of the binary stars and some other stars of the heavens
On_the_coloured_light_of_the_binary_stars_and_some_other_stars_of_the_heavens
2021 NASA planetary defense mission
itself. The collision also very slightly increased the asteroid pair's orbital speed around the Sun—an effect directly relevant to the goal of planetary
Double Asteroid Redirection Test
Double_Asteroid_Redirection_Test
Equilibrium points near two orbiting bodies
increasing the object's orbital period. The closer to Earth the object is, the greater this effect is. At the L1 point, the object's orbital period becomes exactly
Lagrange_point
Specifies the orbit of an object in space
equal to the time of its periastron. Apsidal precession Kepler orbit Orbital mechanics Orbital node Iglesias-Marzoa, Ramón; López-Morales, Mercedes; Jesús
Argument_of_periapsis
Angular speed required for a body to complete one orbit
In orbital mechanics, mean motion (represented by n) is the angular speed required for a body to complete one orbit, assuming constant speed in a circular
Mean_motion
Topics referred to by the same term
Orbital velocity may refer to the following: The orbital angular velocity The orbital speed of a revolving body in a gravitational field. The velocity
Orbital_velocity
1991 studio album by Orbital
Orbital (also known as Orbital 1 or the Green Album) is the debut studio album by English electronic music duo Orbital, released on 30 September 1991 by
Orbital_(1991_album)
Thought experiment about gravity
along a fixed circular orbit "and return to the mountain from which it was projected". If the speed is higher than the orbital velocity, but not high
Newton's_cannonball
Function describing an electron in an atom
{\displaystyle m_{s}} . The simple names s orbital, p orbital, d orbital, and f orbital refer to orbitals with angular momentum quantum number ℓ = 0, 1, 2
Atomic_orbital
Moment in time used as a reference point in astronomy
the disciplines of celestial mechanics or its subfield orbital mechanics (for predicting orbital paths and positions for bodies in motion under the gravitational
Epoch_(astronomy)
exposed to a higher flux of dark matter particles around June 1, when its orbital speed is added to that of the Solar System with respect to the galaxy and
DAMA/NaI
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