taskGNU Astronomy Utilities - Tasks: task #16222, Arithmetic operators to convert...


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task #16222: Arithmetic operators to convert areas for example mag/arcsec2 to counts/pix

Submitter:  Mohammad Akhlaghi <makhlaghi>
Submitted:  Tue 28 Jun 2022 05:53:47 PM UTC
Should Start On:  Mon 27 Jun 2022 11:00:00 PM UTC Should be Finished on:  Mon 27 Jun 2022 11:00:00 PM UTC
Category:  Arithmetic Priority:  5 - Normal
Item Group:  Enhancement Status:  Postponed
Privacy:  Public Percent Complete:  0%
Assigned to:  None Open/Closed:  Open
Effort:  0.00

Tue 28 Jun 2022 05:53:47 PM UTC, original submission:  

It would be very useful to have operators for converting arcsec^2 to number of pixels, and vice-versa. Based on an input WCS. We currently have the necessary operators to convert magnitudes to counts and vice-versa, but we don't have any for converting common area units.

For example:

$ astarithmetic 1 arcsecsq-to-pixnum --wcsfile=image.fits

This will be useful when we need to convert mag/arcsec^2 into image units: counts/pixel. In fact since this is a common conversion, we can have a high-level operator for it, maybe something like this:

$ astarithmetic 25 surfbright-to-countsperpix --wcsfile=image.fits

Of course, if an image with WCS is already present in the Arithmetic command, there is no need to use '--wcsfile'.

These can also be available for column arithmetic in Table.

Mohammad Akhlaghi <makhlaghi>
Project Administrator


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