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astropy-astronomy

Extract photometry and convert pixel coordinates to sky coordinates from FITS observations.

33|6|Updated Mar 17, 2026
Search Tags:#astronomy#fits#wcs#photometry#catalog matching#healpix#cmb power spectrum
One-click install
npx skills add https://github.com/xjtulyc/awesome-rosetta-skills --skill astropy-astronomy-xjtulyc
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: astropy-astronomy
Source: https://github.com/xjtulyc/awesome-rosetta-skills/tree/main/skills/01-physics/astropy-astronomy
Command: npx skills add https://github.com/xjtulyc/awesome-rosetta-skills --skill astropy-astronomy-xjtulyc

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes assets (resource) components.

What problem does it solve?

This Skill solves the problem of turning raw astronomical FITS data into science-ready results by handling WCS coordinate transforms, catalog queries, photometry, and HEALPix-based CMB analysis.

Core Features & Use Cases

  • FITS I/O & inspection: Read and write FITS images and tables (HDUs), manage metadata, and prepare data for downstream analysis.
  • WCS transformations: Convert between pixel coordinates and sky coordinates (RA/Dec, Galactic/Ecliptic), place apertures on known targets, and compute pixel scale.
  • Catalog cross-matching: Query public archives and services (e.g., Vizier and SIMBAD) to identify objects and enrich source lists.
  • Aperture photometry: Subtract background and measure fluxes with circular apertures and sky annuli, producing instrumental magnitudes.
  • HEALPix CMB power spectra: Generate and analyze spherical maps, compute angular power spectra (pseudo workflow), and visualize results.

Quick Start

Use the astropy-astronomy skill to read a FITS image, solve its WCS, detect sources, run aperture photometry, and return a table of measured fluxes and instrumental magnitudes.

Frequently Asked Questions about astropy-astronomy

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I convert pixel coordinates to sky coordinates in a FITS image?▼

To convert pixel coordinates to sky coordinates in a FITS image, this Skill applies WCS transformations using astropy, translating pixel arrays into physical RA/Dec or Galactic/Ecliptic sky coordinates and computing the pixel scale.

How do I perform aperture photometry on FITS imaging data?▼

To perform aperture photometry on FITS imaging data, this Skill subtracts the background using sky annuli and measures source fluxes through circular apertures, producing a table of instrumental magnitudes.

Can I query and cross-match astronomical catalogs like Vizier and SIMBAD?▼

Yes, you can cross-match astronomical catalogs like Vizier and SIMBAD. This Skill utilizes astroquery to access public archives, identify objects, and enrich your source lists with matched catalog data.

How do I compute the angular power spectrum of a CMB HEALPix map?▼

To compute the angular power spectrum of a CMB HEALPix map, this Skill generates and analyzes spherical maps via healpy, estimating C_l values through a pseudo workflow and visualizing the recovered power spectrum.

What Python packages do I need for FITS I/O and HEALPix CMB analysis?▼

For FITS I/O and HEALPix CMB analysis, you need astropy for WCS and FITS handling, astroquery for catalog access, healpy for spherical maps and C_l estimation, plus numpy and matplotlib for numerical support and plotting.

Does astropy work for reading and writing FITS tables and image HDUs?▼

Yes, astropy works for reading and writing FITS tables and image HDUs. This Skill manages HDU metadata and prepares raw astronomical FITS data for downstream photometry and coordinate transformation analysis.

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