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Reference Position (Offset)
Up to two reference positions can be specified if this option has been selected in the panel above. These can be used to define offsets for On The Fly observing or for system temperature measurement. The parameters are:
- Reference Coordinates:
- Coords Type: Choose between absolute or relative coordinates. All offsets are relative to the source coordinate i.e. not to the requested pointing positions which can themselves be offsets from the source coordinate. It is not absolutely clear if absolute coordinates are supported - it's therefore safest to use relative. Only FK5 J2000 and horizon offsets are currently supported.
- Absolute offset inputs:
- Relative offset inputs:
- System:
- Offset(Longitude): Relative to the source coordinate.
- Offset(Latitude): Relative to the source coordinate.
- Integration Time: Time spent integrating per visit. Set, but almost certainly not used by the telescope control system.
- Cycle Time:
- Sub Scan Duration: Set, but almost certainly not used by the telescope control system. It must though be an integer multiple of both the integration duration and 48 ms or else the project will not validate. If an approximation is entered (the real value normally has lots of decimal places), a button is available to adjust this to the nearest legal value.
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The ALMA OT Team, 2017 Dec 18