Definitions for "Radial velocity"
Related Terms:
Space velocity, Shear, Proper motion, Orbital motion, Stationary point, Doppler shift, Vad, Angular velocity, Stellar parallax, Hodograph, Precession, Inertia , Angular momentum, Rotate, Stationary, Anomaly, Revolve, Wind shear, Moment of inertia, Orbit , Inclined orbit, Mean motion, Motion parallax, Nephoscope, Revolution , Orbital plane, Slew, Streamline , Nutation , Mean anomaly, Linear momentum, Vorticity, Doppler radar, Geosynchronous orbit, Inclination, Direct motion, Aerobraking, Veer, Rising, Equatorial orbit, Gso, Synchronous rotation, Geostationary orbit, Rotation, Geosynchronous, Retrograde motion, Kinematics, Diurnal motion, Escape velocity
the speed at which an object is moving away or toward an observer. By observing spectral lines, astronomers can determine how fast objects are moving away from or toward us; however, these spectral lines cannot be used to measure how fast the objects are moving across the sky. (See also text in Spec and Mov.)
the rate of change of the distance to an object.
speed toward or away from the observer.
the velocity along the line of sight.
velocity along the line of sight toward or away from the observer
The component of relative velocity that lies in the fine of sight; motion toward or away from the observer.
the velocity of an object toward or away from an observer
Portion of an object's velocity which is parallel to the line of sight.
( ) - ( km/s - kilometers per second ) The movement of a star relative to the Sun directly towards (negative) or away (positive) which can be derived from the parallax and proper motion. Q is the angle between object star's celestial convergent point and the direction to the Sun. VR = 4.74 / Parallax (tan Q).
(RV) The speed of an object in the direction towards or away from the observer. In an expanding universe a galaxy with a larger radial velocity generally lies further from the observer than one with a smaller radial velocity.
the component of motion toward or away from a given location. As detected by Doppler radar, it is the component of motion parallel to the radar beam. An object moving perpendicular to the radar beam has a radial velocity of zero.
Component of motion toward or away from a given location. As "seen" by Doppler radar, it is the component of motion parallel to the radar beam. (The component of motion perpendicular to the beam cannot be seen by the radar. Therefore, strong winds blowing strictly from left to right or from right to left, relative to the radar, can not be detected.)
The line-of-sight velocity of a star or other celestial object towards or away from an observer. Astronomers can calculate the radial velocity of a celestial objects by recording a spectrum with a spectrograph and measuring the Doppler shift of several spectral lines. Measurements of radial velocity have revealed how our Solar System moves through space and orbits the center of our galaxy. Astronomers have also used radial velocity measurements to observe that most objects beyond our galaxy travel away from us at speeds that increase with the object's distance.
That component of an objects velocity directed away from or toward Earth.
The component of a three-dimensional velocity vector oriented along the radial direction from the origin point or axis in polar, cylindrical, or spherical coordinates. In connection with Doppler radar, the radial velocity component is called Doppler velocity. See also curvilinear coordinates.
A type of velocity that expresses motion toward or away from a given location. In Doppler radar, it is the component of motion that is parallel to the radar beam.
Radial velocity is the velocity of an object in the direction of the line of sight. The light of an object with a substantial radial velocity will be subject to Doppler effect, so the wavelength of the light increases for receding objects (redshift) and decreases for approaching objects (blueshift).