GNU Astronomy Utilities - Tasks: task #16282, Include ICRS equatorial coordinate...
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task #16282: Include ICRS equatorial coordinate type
Submitter: | Mohammad Akhlaghi <makhlaghi> | ||
Submitted: | Mon 24 Oct 2022 05:27:49 PM UTC | ||
Should Start On: | Sun 23 Oct 2022 11:00:00 PM UTC | Should be Finished on: | Sun 23 Oct 2022 11:00:00 PM UTC |
Category: | Libraries | Priority: | 5 - Normal |
Item Group: | Enhancement | Status: | None |
Privacy: | Public | Assigned to: | None |
Percent Complete: | 0% | Open/Closed: | Open |
Effort: | 0.00 |
Sun 17 Sep 2023 11:01:54 PM UTC, comment #2: |
Mohammad Akhlaghi <makhlaghi> |
Mon 24 Oct 2022 11:06:06 PM UTC, comment #1: A nice review of ICRS in relation to FK5 and J2000 is given in Feissel and Mignard 1998. In their Figure 1, they show the pole positions in relation to each other.
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Mohammad Akhlaghi <makhlaghi> |
Mon 24 Oct 2022 05:27:49 PM UTC, original submission:
As of Gnuastro 0.19, we still don't recognize the "International Celestial Reference System" or ICRS (which is the IAU approved coordinate system; unlike FK5; that we do support!).
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Mohammad Akhlaghi <makhlaghi> |
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Corresponding source code
With the new 'gal_wcs_coordsys_convert_points' that was added in de51acf8cf1, this task becomes much more easier (to use the same three Euler angles that WCSLIB uses for converting to-from different coordinate systems).
Also, while looking into this, I noticed that SOFA (Standards of Fundamental Astronomy; published by IAU) contains the three angles from Galactic to ICRS in its g2icrs.c file:
For such constants, it may be good to write a small program that uses SOFA during bootstrapping to build all the constants we need for coordinate conversion in Gnuastro (just a brainstorm now).