Description
Converts the position and velocity specified by fromVector from the fromSystem coordinate system to a velocity in the toSystem coordinate system, referencing the coordinate systems to the specified epoch.
Timing Precision Mode
This page describes functionality in nanosecond timing precision mode.
Function Signature
Arguments
fromSystem
|
|
Description:
|
Coordinate system of input velocity.
|
Valid Values:
|
Value
|
Label
|
1
|
ICRF
|
2
|
Mean of J2000 Earth Ecliptic
|
3
|
True of Date Earth Equator
|
4
|
Earth Fixed
|
5
|
Local Coordinates - Longitude
|
6
|
True Equator Mean Equinox
|
7
|
Local Coordinates - Longitude/Latitude
|
8
|
Mean of Date Earth Equator
|
9
|
Mean of 1950 Earth Equator
|
10
|
Moon Fixed (Principle Axis Rotating)
|
11
|
TIRF
|
12
|
Moon Principle Axis - Inertial at J2000
|
13
|
Moon Principle Axis - Inertial at Epoch
|
14
|
Moon Mean Earth - Rotating
|
15
|
Moon Mean Earth - Inertial at J2000
|
16
|
Moon Mean Earth - Inertial at Epoch
|
17
|
Mean of J2000 Earth Equator
|
18
|
CIRF
|
19
|
Specify any CelestialObject.ReferenceFrameId
|
|
toSystem
|
|
Description:
|
Coordinate system of output velocity.
|
Valid Values:
|
Value
|
Label
|
1
|
ICRF
|
2
|
Mean of J2000 Earth Ecliptic
|
3
|
True of Date Earth Equator
|
4
|
Earth Fixed
|
5
|
Local Coordinates - Longitude
|
6
|
True Equator Mean Equinox
|
7
|
Local Coordinates - Longitude/Latitude
|
8
|
Mean of Date Earth Equator
|
9
|
Mean of 1950 Earth Equator
|
10
|
Moon Fixed (Principle Axis Rotating)
|
11
|
TIRF
|
12
|
Moon Principle Axis - Inertial at J2000
|
13
|
Moon Principle Axis - Inertial at Epoch
|
14
|
Moon Mean Earth - Rotating
|
15
|
Moon Mean Earth - Inertial at J2000
|
16
|
Moon Mean Earth - Inertial at Epoch
|
17
|
Mean of J2000 Earth Equator
|
18
|
CIRF
|
19
|
Specify any CelestialObject.ReferenceFrameId
|
|
epoch
|
|
Description:
|
The TAI epoch of the input and/or output velocity in modified Julian date format. If both the input and output coordinate systems are referenced to an epoch, both will be defined using this epoch.
|
fromVector
|
|
Description:
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A six-element array containing the position and velocity in the input coordinate system.
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Required Size:
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At least 6
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Return Value
Type:
|
Array of number (size = 3)
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Units:
|
km/s
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Returns a three-element array containing the velocity in the output coordinate system.
Syntax
myArray1 = VelocityConvert(myVariable1, myVariable2, myTimeSpan1, myArray2);
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See also
VelocityConvert
Orbit Reference Frames
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