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 | Percent Complete: | 0% |
Assigned to: | None | Open/Closed: | Open |
Effort: | 0.00 |
Mon 24 Oct 2022 11:06:06 PM UTC, comment #1: |
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!).
This stems from the fact that in lib/wcs.c we have used NED for the conversion of coordinate system information and NED doesn't have ICRS!
We should find the conversions (possibly from the link above, or other places) and implement them in the WCS library because many surveys like SDSS, J-PLUS or J-PAS use this equatorial coordinate system.
You can reproduce the problem like below:
|
Mohammad Akhlaghi <makhlaghi>![]() |
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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.
We should be able to use these pole positions to convert ICRS to 'eq-j2000' and from that, to all the other coordinate systems that are currently recognized.
Some other references: