NovasRadVel Method

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

Definition

Namespace: ASCOM.Tools.Novas31
Assembly: ASCOM.AstrometryTools (in ASCOM.AstrometryTools.dll) Version: 3.0.0-rc.1+86c25ce733aebb4d8b1b8a62e84770ea5e972bea

C#

public static void RadVel(
	Object3 CelObject,
	double[] Pos,
	double[] Vel,
	double[] VelObs,
	double DObsGeo,
	double DObsSun,
	double DObjSun,
	ref double Rv
)

VB

Public Shared Sub RadVel ( 
	CelObject As Object3,
	Pos As Double(),
	Vel As Double(),
	VelObs As Double(),
	DObsGeo As Double,
	DObsSun As Double,
	DObjSun As Double,
	ByRef Rv As Double
)

Parameters

CelObject Object3: Specifies the celestial object of interest
Pos Double: Geometric position vector of object with respect to observer, corrected for light-time, in AU.
Vel Double: Velocity vector of object with respect to solar system barycenter, in AU/day.
VelObs Double: Velocity vector of observer with respect to solar system barycenter, in AU/day.
DObsGeo Double: Distance from observer to geocenter, in AU.
DObsSun Double: Distance from observer to Sun, in AU.
DObjSun Double: Distance from object to Sun, in AU.
Rv Double: 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.

Version Information

.NET Standard

Supported in: 2.0