next up previous
Next: StdOfRest - Standard of rest
Up: AST Attribute Descriptions
Previous: SourceVRF - Rest frame in which the source velocity is stored

SourceVel - The source velocity   

Description:
This attribute (together with SourceVRF, RefRA and RefDec) defines the "Source" standard of rest (see attribute StdOfRest). This is a rest frame which is moving towards the position given by RefRA and RefDec at a velocity given by SourceVel (in km/s). When setting a value for SourceVel, the velocity should be supplied in the rest frame specified by the SourceVRF attribute. Likewise, when getting the value of SourceVel, it will be returned in the rest frame specified by the SourceVRF attribute.

The default value is zero.

Type:
Floating point.

Class Applicability:
SpecFrame
All SpecFrames have this attribute.



next up previous
Next: StdOfRest - Standard of rest
Up: AST Attribute Descriptions
Previous: SourceVRF - Rest frame in which the source velocity is stored

AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 211
R.F. Warren-Smith & D.S. Berry
30th April 2003
E-mail:ussc@star.rl.ac.uk

Copyright (C) 2003 Central Laboratory of the Research Councils