taskGNU Astronomy Utilities - Tasks: task #16440, Conversion of celestial...

 
 

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task #16440: Conversion of celestial coordinates in a table in unit.h

Submitter:  Mohammad Akhlaghi <makhlaghi>
Submitted:  Sat 16 Sep 2023 04:22:11 PM UTC
   
 
Should Start On:  Fri 15 Sep 2023 10:00:00 PM UTC Should be Finished on:  Fri 15 Sep 2023 10:00:00 PM UTC
Category:  Libraries Priority:  5 - Normal
Item Group:  Enhancement Status:  Done
Privacy:  Public Assigned to:  makhlaghi
Percent Complete:  100% Open/Closed:  Closed
Effort:  0.00

Sun 17 Sep 2023 10:34:30 PM UTC, comment #2: 

This task has been completed in Commit de51acf8cf on Gnuastro's 'master' branch.

Mohammad Akhlaghi <makhlaghi>
Group administrator
Sun 17 Sep 2023 03:26:56 AM UTC, comment #1: 

Some good progress was made in Commit 81143ea75e (on the 'coordsys-points' branch of this repository).

But as described in the commit description, the conversion to and from a coordinate system (which should give the input value) does not yet work properly when using non-galactic coordinates. See the commit message for more details.

Mohammad Akhlaghi <makhlaghi>
Group administrator
Sat 16 Sep 2023 04:22:11 PM UTC, original submission:  

As of Gnuastro 0.20, only the conversion of the WCS coordinate system is supported within a FITS image (through the '--wcscoordsys' of the Fits program; see documentation).

In other situations, it is necessary to convert a table of coordinates from one system to another (for example through column arithmetic). We need a set of functions for this in 'unit.h' (they can use the polar conversions that are already available in 'wcs.h'.

The mathematics of the conversion are very nicely described in this StackExchange answer.

Mohammad Akhlaghi <makhlaghi>
Group administrator

 

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    Follow 5 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2023-09-17 makhlaghi Open/ClosedOpen Closed
    2023-09-17 makhlaghi StatusNone Done
        Percent Complete80% 100%
        Assigned toNone makhlaghi
    2023-09-17 makhlaghi Percent Complete0% 80%

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