Inspecting and stacking astronomical FITS images

Published by Lia Corrales and coauthors / Learn Astropy

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The public work

The tutorial opens a Horsehead Nebula FITS image, displays its dimensions, statistics, histogram and alternative stretches, then sums M13 images and writes the resulting FITS file.

What to notice

Separate display scaling from data transformation; dimensions, metadata and raw values should remain traceable through visualization and export.

Keep the context

An introductory image workflow, not a complete calibrated photometry pipeline. Display contrast is not measured scientific improvement; registration, calibration and acquisition metadata require separate attention.

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Authored practice suggestion

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Check your own work.

Use material you are allowed to work with. This suggestion is preparation; it does not record a completed task or an improvement.

A prompt to adapt privately

Using local tutorial FITS files, inspect the header and image dimensions, calculate basic statistics, and compare linear and logarithmic displays without changing the array. Reproduce the image sum in a new output file, then reopen it and verify dimensions and selected pixel values.

A check to adapt

Display changes leave input values intact; the output sum matches an independent calculation; reopened dimensions and retained metadata are documented.

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