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NOVAS31RadVel Method
Predicts the radial velocity of the observed object as it would be measured by spectroscopic means.

Namespace: ASCOM.Astrometry.NOVAS
Assembly: ASCOM.Astrometry (in ASCOM.Astrometry.dll) Version: 6.0.0.0 (6.3.0.2839)
Syntax
public void RadVel(
	Object3 CelObject,
	double[] Pos,
	double[] Vel,
	double[] VelObs,
	double DObsGeo,
	double DObsSun,
	double DObjSun,
	ref double Rv
)

Parameters

CelObject
Type: ASCOM.AstrometryObject3
Specifies the celestial object of interest
Pos
Type: SystemDouble
Geometric position vector of object with respect to observer, corrected for light-time, in AU.
Vel
Type: SystemDouble
Velocity vector of object with respect to solar system barycenter, in AU/day.
VelObs
Type: SystemDouble
Velocity vector of observer with respect to solar system barycenter, in AU/day.
DObsGeo
Type: SystemDouble
Distance from observer to geocenter, in AU.
DObsSun
Type: SystemDouble
Distance from observer to Sun, in AU.
DObjSun
Type: SystemDouble
Distance from object to Sun, in AU.
Rv
Type: SystemDouble
The observed radial velocity measure times the speed of light, in kilometers/second.
Remarks
Radial velocity is here defined as the radial velocity measure (z) times the speed of light. For a solar system body, it applies to a fictitious emitter at the center of the observed object, assumed massless (no gravitational red shift), and does not in general apply to reflected light. For stars, it includes all effects, such as gravitational red shift, contained in the catalog barycentric radial velocity measure, a scalar derived from spectroscopy. Nearby stars with a known kinematic velocity vector (obtained independently of spectroscopy) can be treated like solar system objects.
See Also