Astropy
A community Python library for Astronomy.
- Status
- Generally available
- Last checked
- Checked · Oct 5, 2026
- License
- Open source
- Pricing
- Free tier · from $0
What it is
Astropy is a powerful and flexible library that provides core astronomy functionality in Python. It includes tools for handling astronomical data, coordinate transformations, and more, making it essential for researchers and developers working with astronomical datasets.
Astropy stands out as the most comprehensive and community-driven Python library specifically designed for astronomy, offering a wide range of functionalities that are essential for handling and analyzing astronomical data.
When it fits — and when it doesn’t
A good fit for
Researchers needing to handle and analyze large astronomical datasets efficiently
Developers building applications that require precise coordinate transformations for celestial objects
Educators teaching astronomy or astrophysics who need a robust Python library
Look elsewhere if
Projects requiring real-time data processing (Astropy is optimized for batch processing)
Applications needing machine learning capabilities specific to astronomical data analysis (though it can be used alongside ML libraries)
Known weaknesses
Each one links to the public issue, changelog or docs page it came from, where we have one.
- 01
Steep learning curve for non-astronomers
Astropy's API and functionality are deeply rooted in astronomy-specific concepts, making it challenging for developers without a background in the field to understand and utilize effectively.
- 02
Limited documentation for advanced features
While basic usage is well-documented, more complex functionalities such as advanced coordinate transformations and handling specific astronomical data formats have sparse or outdated documentation.
- 03
Performance issues with large datasets
Astropy can be slow when processing large FITS files or performing extensive coordinate transformations, which may lead to significant delays in research and development workflows.
- 04
Frequent breaking changes between versions
Version updates often include API changes that require existing codebases to be updated, leading to maintenance overhead for users who need to keep their projects up-to-date with the latest features and bug fixes.
- 05
Small community support
While Astropy is widely used in astronomy research, the community size is relatively small compared to more general-purpose Python libraries, which can lead to slower response times for issues and feature requests.
What it does well
Coordinate transformations and handling
Time and date manipulation
FITS file reading and writing
Units and physical quantities support
Pricing
- Free tier
- YesOpen source — free to use
- Paid from
- $0
- Model
- Flat rate
- Enterprise plan
- No
Pricing last confirmed Sep 26, 2026.
Performance benchmarks
How Fast Is It?
Set up Astropy
Setup steps, common gotchas and what to check after 30 days.