New Celestial Coordinates Task - IMCTRAN
A new task for transforming image celestial coordinate systems from one
coordinate system to another, imctran, has been added to the image
matching package IMMATCH.
Imctran currently supports the equatorial (fk4, fk4 [no e
terms], fk5, geocentric apparent) coordinate systems on input and output,
and the ecliptic, galactic, and supergalactic celestial coordinate systems
on output. Full support for the non-equatorial coordinate systems will become
available with the next major release of iraf. Imctran handles the tan, sin,
and arc sky projections correctly, but should not be used with the gls
projection in its current form. A typical application of imctran is to
precess the coordinate systems of a set of images to a common epoch.
Imctran uses the iraf imio and mwcs libraries to attach celestial coordinate
values to the input image pixels and the Starlink positional astronomy library
slalib to perform any required celestial coordinate transformations. Slalib
has been made available to the iraf project courtesy of Patrick Wallace
of Starlink, and will be distributed as part of the iraf core system
math package in future releases of iraf.
Imctran is available as part of the external add-on package
To retrieve and install immatch, follow the installation instructions
found in the
Last updated: 24April1996