Velocity Dispersion
Rotationally supported objects (left) have the majority of stars orbiting in the same direction. With velocity dispersion (right), approximately equal numbers of stars orbiting in all directions.
Velocity :
Velocity is a quantity that designates how fast and in what direction a point is moving.
radial velocity - Space and Astronomy Definition - Online Dictionary and Gl...
shock wave - Space and Astronomy Definition - Online Dictionary and Glossar...
Fast Fourier Transformation (FFT) - Space and Astronomy Definition - Online...
Escape Velocity
Related Category: Astronomy: General
the velocity a body must be given in order to escape the gravitational hold of some other larger body, e.g., the earth, moon, or sun.
Radial velocity
Radial velocity is the velocity of an object in the direction of the line of sight.
escape velocity
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Essential reading Compare
side-by-side A Dictionary of Astronomy The Columbia Encyclopedia, Sixth Edition ...
Radial velocity
Wikipedia, the free encyclopedia - Cite This Source ...
Escape Velocity
NASA's New Horizons spacecraft is the fastest ever launched, speeding away from Earth at an escape velocity of 36,000 miles per hour. Image Credit: NASA ...
H-Atom: Areal Velocity
Areal Velocity
Kepler's second law states that the areas swept out by a planet during a common time interval are the same. Thus the yellow areas below should all have the same area. Do they?
VELOCITY DISPERSION - Random motions (orbits) of stars which support a self-gravitating body against collapse. Motions can be either ordered or random.
Velocity and Acceleration
Let us now give a precise definition of velocity and acceleration. They are vectors, so we must give a magnitude and a direction for them. The velocity v and the acceleration a are defined in the following illustration, ...
Velocity V will be measured in kilometers per second (km/s), and different velocities are identified by subscripts. Lower-case v identifies velocities associated with orbits around Earth rather than around the Sun.
Velocity
The speed and the direction of an object's motion.
Velocity Dispersion ...
Velocity dispersion: this is a total-mass indicator, and is generally largest for rich, regular, relaxed clusters. An unbiased (or maybe only slightly biased) virial mass estimator is given by Heisler et al 1985 (ApJ 298, 8) as ...
Velocity -- A vector quantity whose magnitude is a body's speed and whose direction is the body's direction of motion.
Venus -- Second planet from the sun, a terrestrial planet.
VGR1 -- Voyager 1 spacecraft.
Velocity Dispersion Method
A method of finding a galaxy's mass by observing the range of velocities within the galaxy.
Vernal Equinox ...
velocity: A rate of travel that specifies both speed and direction.
velocity dispersion method: A method of finding a galaxy's mass by observing the range of velocities within the galaxy.
Velocity - A physical quantity that gives the speed of a body and the direction in which it is moving ...
velocity description of an object's motion that includes both its speed AND its direction of travel. velocity dispersion the spread of the distribution of the velocities.
Velocity of satellite in low orbit (km/hr)
Escape velocity from surface (km/hr)
Sun ...
High velocity nozzles
Frequently the goal is to increase the kinetic energy
Kinetic energy ...
Mass-Velocity Relationship
In developing special relativity, Einstein found that the kinetic energy of a moving body is
with v the velocity, and m0 the rest mass.
radial velocity
the velocity of an object toward or away from an observer
radiant ...
Radial Velocity
Working once again with the tug of the planet on the star, though this time measuring the difference in the light rather than the proper motion of the star.
Escape Velocity
the speed required for an object to escape the gravitational pull of a planet or other body.
Event Horizon
the invisible boundary around a black hole past which nothing can escape the gravitational pull - not even light.
Escape velocity. The minimum speed that an object must attain to escape from the surface of the planet or other body without being given any extra impetus. The escape velocity of Earth is 11.2 kilometres per second.
Radial velocity- the movement of a celestial body toward or away from an observer
Radiant- the point on the sky from where a shower of meteors appears to come ...
ESCAPE VELOCITY
The escape velocity is how fast an object has to be moving away from a planetary object in order to escape its gravitational field.
...
Radial Velocity
the speed at which an object is moving away or toward an observer.
Velocity The speed and direction in which an object moves.
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VELOCITY
Velocity is both the speed and the direction that a body is moving. It has more information than speed alone. Velocity is a ...
velocity = frequency x wavelength or v = f λ
Electromagnetic waves have a constant velocity, c, in a vacuum where c ≈ 3.0 x 108 m.s-1.
Image: NASA ...
Velocity of galaxies (almost all redshifts)
Hubble diagram : velocity (km/s) versus distance (Mpc) ...
velocity = velocity of object measured in km/s, since c is given in those units (300,000 km/s)
z = redshift, as defined in the previous formula section ...
Velocity
The speed of an object moving in a specific direction. A car traveling at 35 miles per hour is a measurement of speed. Observing that a car is traveling 35 miles per hour due north is a measurement of velocity.
Venus ...
velocity dispersion - (n.)
A measure of the average velocity of stars in a group or cluster with random internal motions. In globular clusters and elliptical galaxies, the velocity dispersion can be used to infer the central mass.
Velocity required by a body to achieve a circular orbit around its primary: Vorb = (GM / r)1/2. [H76]
Orbiting Collision ...
"Velocity curves" for the spectroscopic binary Pi Scorpii (derived from spectral Doppler shifts) show the back-and-forth velocities of each of the two components.
The velocity of the material flowing in these loops can be determined using the "Doppler effect.
The velocity limit at which laminar flow can no longer dissipate friction is evaluated as the Reynolds number, calculated as the average viscosity and physical dimension of the flow as a proportion of the flow velocity.
The velocity of propagation of electromagnetic waves depends upon frequency. Thus, unless the wave is highly monochromatic, the energy in the wave arrives at the receiver at differing times.
The velocity is relatively easy for us to measure using the Doppler effect, or Doppler shift. An object in motion will have its radiation (i.e. light) shifted in wavelength according to the following formula: ...
The velocity at which an object moves away from an observer. The recessional velocity of a distant galaxy is proportional to its distance from Earth. Therefore, the greater the recessional velocity, the more distant the object.
Redshift ...
Mass, velocity, charge of submicron particles
Radio Science: Celestial Mechanics
John Anderson, JPL (Team Leader) ...
radial velocity
References
Gonzalez, G., and Vanture, A. "Parent Stars of Extrasolar Plnets III: Rho1 Cancri Revisited," Astronomy & Astrophysics, 339, L29 (1998).
Butler, P., Marcy, G., Williams, E., Hauser, H., and Shirts, P.
radial velocity
That component of an objects velocity directed away from or toward Earth.
radiation pressure ...
Radial velocity variations would suggest that star B has a substellar companion of about eight times the mass of Jupiter in an orbit of about 30 to 100 years to complete.
Escape velocity
Schwarzschild radius of a black hole
Kepler's Law to measure the mass of galaxies
Hubble's Law ...
escape velocity The speed necessary for an object to escape the gravitational pull of an object. Anything that moves away from the object with more than the escape velocity will never return.
Radial velocity measurements collected over 14 years using ground-based telescopes provided even more precise information on the nature of the planets' orbits, and also yielded clues that a fourth planet might be orbiting even further out, ...
Escape velocity
The speed an object must have in order to escape from another objects gravity.
Exosphere ...
Radial velocity is measured by the doppler shift of the star's spectral lines, and is given in units of km/s. The proper motion of a star is determined by precise astrometric measurements in units of milli-arc seconds (mas) per year.
Relative Velocity of C+C = 2C divided by 1 + 1/1
Relative Velocity of C+C = 2C divided by 1 + 1
Relative Velocity of C+C = 2C divided by 2 = C, the answer ...
c is the velocity of light, 300,000 km/s
For example, the hydrogen alpha line has a laboratory wavelength of 656.285 nm. If this spectral line in the light from a nearby star is 656.315 nm, we can calculate its receding speed as follows: ...
radial velocity In radar, that vector component of the velocity of a moving target that is directed away from or toward the ground station.
where c is the velocity of light in a vacuum, m0 is the rest mass, and m is the moving mass. kinetic pressure (Plasma Physics and Fusion Energy Glossary) Density of kinetic energy (energy in the thermal motions of the plasma particles).
Esc vel Escape velocity in kilometers per second M.O.V. Mean Orbital Velocity in kilometers per second Axial incl Inclination of the rotation axis in degrees (obliquity) Oblate Oblateness Ascend Longitude of the ascending node Perihelion Longitude of ...
Superluminal velocity: The apparent motion of an object at greater than light speed; This appearance is caused by a "projection effect" by the object's motion toward Earth.
As the Moon falls towards the Earth, under the influence of gravity, the Moon's orbital velocity (actually its "tangential velocity") causes the Moon to fall off center to the Earth.
If we throw a small rock up to the sky, it will fall back to the ground. If we throw it slightly faster, it will go up higher. However, if we throw it faster than the escape velocity, the rock will go out to the space and never return.
 See also: Light, Earth, Distance, Orbit, Sun
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