# Astroalign: A Python module for astronomical image registration

arXiv: https://arxiv.org/abs/1909.02946 · HTML: https://mlsanity.com/paper/1909.02946/

## Key facts

- Cited by 1 papers in the map (data through 14 Oct 2026).
- First posted on arXiv 6 Sep 2019.

## Built on by (most cited first, 1 of 1)

- [An Extended Evaluation Split for DeepSpaceYoloDataset](https://mlsanity.com/paper/2604.27593/) (2026)

## Abstract (arXiv)

We present an algorithm implemented in the astroalign Python module for image registration in astronomy. Our module does not rely on WCS information and instead matches 3-point asterisms (triangles) on the images to find the most accurate linear transformation between the two. It is especially useful in the context of aligning images prior to stacking or performing difference image analysis. Astroalign can match images of different point-spread functions, seeing, and atmospheric conditions.