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VelocityVector Class

Note: This API is now obsolete.

NOVAS-COM: VelocityVector Class
Inheritance Hierarchy
SystemObject
  ASCOM.Astrometry.NOVASCOMVelocityVector

Namespace: ASCOM.Astrometry.NOVASCOM
Assembly: ASCOM.Astrometry (in ASCOM.Astrometry.dll) Version: 6.0.0.0 (6.2.0.2774)
Syntax
[ObsoleteAttribute("This class will be withdrawn in the next major release, please use the SOFA or NOVAS31 classes instead")]
public class VelocityVector

The VelocityVector type exposes the following members.

Constructors
  NameDescription
Public methodVelocityVector
Creates a new velocity vector object
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Properties
  NameDescription
Public propertyDecVelocity
Linear velocity along the declination direction (AU/day)
Public propertyRadialVelocity
Linear velocity along the radial direction (AU/day)
Public propertyRAVelocity
Linear velocity along the right ascension direction (AU/day)
Public propertyx
Cartesian x component of velocity (AU/day)
Public propertyy
Cartesian y component of velocity (AU/day)
Public propertyz
Cartesian z component of velocity (AU/day)
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Methods
  NameDescription
Public methodSetFromSite
Initialize the VelocityVector from a Site object and Greenwich Apparent Sdereal Time.
Public methodSetFromSiteJD(Site, Double)
Initialize the VelocityVector from a Site object using UTC Julian Date
Public methodSetFromSiteJD(Site, Double, Double)
Initialize the VelocityVector from a Site object using UTC Julian Date and Delta-T
Public methodSetFromStar
Initialize the VelocityVector from a Star object.
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Remarks
NOVAS-COM objects of class VelocityVector contain vectors used for velocities (earth, sites, planets, and stars) throughout NOVAS-COM. Of course, its properties include the x, y, and z components of the velocity. Additional properties are the velocity in equatorial coordinates of right ascension dot, declination dot and radial velocity. You can initialize a PositionVector from a Star object (essentially an FK5 or HIP catalog entry) or a Site (lat/long/height). For the star object the proper motions, distance and radial velocity are used, for a site, the velocity is that of the observer with respect to the Earth's center of mass.
See Also