ASCOM Library
Velocity
NOVAS-COM: VelocityVector Class
Definition
Namespace: ASCOM.Tools.NovasCom
Assembly: ASCOM.AstrometryTools (in ASCOM.AstrometryTools.dll) Version: 2.2.1+77356f79b05b579f6d860a4edd5934fda9fe29e4
Assembly: ASCOM.AstrometryTools (in ASCOM.AstrometryTools.dll) Version: 2.2.1+77356f79b05b579f6d860a4edd5934fda9fe29e4
C#
public class VelocityVectorVB
Public Class VelocityVector- Inheritance
- Object VelocityVector
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.
Constructors
| VelocityVector | Creates a new velocity vector object |
Properties
| DecVelocity | Linear velocity along the declination direction (AU/day) |
| RadialVelocity | Linear velocity along the radial direction (AU/day) |
| RAVelocity | Linear velocity along the right ascension direction (AU/day) |
| x | Cartesian x component of velocity (AU/day) |
| y | Cartesian y component of velocity (AU/day) |
| z | Cartesian z component of velocity (AU/day) |
Methods
| SetFromSite | Initialize the VelocityVector from a Site object and Greenwich Apparent Sdereal Time. |
| SetFromSiteJD(Site, Double) | Initialize the VelocityVector from a Site object using UTC Julian Date |
| SetFromSiteJD(Site, Double, Double) | Initialize the VelocityVector from a Site object using UTC Julian Date and Delta-T |
| SetFromStar | Initialize the VelocityVector from a Star object. |