Astro::Coords::Calibration - calibrations that do not have coordinates

  $c = new Astro::Coords::Calibration();

Occasionally observations do not have any associated coordinates. In particular calibration observations such as DARKs and ARRAY TESTS do not require the telescope to be in any particular location. This class exists in order that these types of observation can be processed in similar ways to other observations (from a scheduling viewpoint calibration observations always are an available target).

This class inherits from Astro::Coords::Fixed.

new

Simply instantiates an object with an Azimuth of 0.0 degrees and an elevation of 90 degrees. The exact values do not matter.

A label can be associated with the calibration (for example, to include the type).

  $c = new Astro::Coords::Calibration( name => 'DARK' );

type

Return the coordinate type. In this case always return "CAL".

array

Returns a summary of the object in an 11 element array. All elements are undefined except the first. This contains "CAL".

status

Return a status string describing the current coordinates. For calibration objects this is very simple.

isObservable

Determines whether the observation is observable. Since a calibration observation (defined as an observation that does not move the telescope) is always observable this methods always returns true.

stringify

Returns stringified summary of the object. Always returns the type().

summary

Return a one line summary of the coordinates. In the future will accept arguments to control output.

  $summary = $c->summary();

Usually called via Astro::Coords.

Astro::SLA is used for all internal astrometric calculations.

Tim Jenness <tjenness@cpan.org>

Copyright (C) 2001-2005 Particle Physics and Astronomy Research Council. All Rights Reserved.

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