User Guide

Photutils is a Python library that provides commonly-used tools and key functionality for detecting and performing photometry of astronomical sources. Photutils is organized into subpackages covering different topics, which are listed below.

Backgrounds

• Background Estimation (photutils.background)

Source Detection

• Source Detection (photutils.detection)
• Image Segmentation (photutils.segmentation)

Aperture Photometry

• Aperture Photometry (photutils.aperture)

PSF Photometry and Tools

• PSF Photometry (photutils.psf)
• Building an effective Point Spread Function (ePSF)
• Source Grouping Algorithms
• PSF Matching (photutils.psf.matching)

Segmentation and Source Measurements

• Image Segmentation (photutils.segmentation)
• Centroids (photutils.centroids)
• Morphological Properties (photutils.morphology)

Radial Profiles

• Profiles (photutils.profiles)

Isophotes

• Elliptical Isophote Analysis (photutils.isophote)

Utilities

• Utility Functions (photutils.utils)
• Datasets (photutils.datasets)
• Geometry Functions (photutils.geometry)