Shadowing Diagrams

The hour angle range that the ATCA can observe is limited by the horizon of the antennas (12^o). Additionally, in some configurations, some antennas shadow others. In east-west configurations, shadowing happens for a range of declinations between +30^o and -47^o for spacings which are 61 m or shorter. For hybrid configurations, the shadowing is more complex.

The following diagrams give the range to hour angles where a given source is above the horizon and unshadowed: the grey areas are the areas of unobstructed observing.

Horizon/shadowing diagram for east-west configurations (also see a postscript version).


Horizon/shadowing diagram for the H75 configuration (also see a postscript version).


Horizon/shadowing diagram for the H168 configuration (also see a postscript version).


Horizon/shadowing diagram for the H214 configuration (also see a postscript version).

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Original: Bob Sault (21-May-2003)
Modified: Bob Sault (21-May-2003)