Warning

THELI v2 is no longer supported as of February 2018, as the code base is very outdated and faces increasing installation difficulties. A complete rewrite, THELI v3, is available from https://github.com/schirmermischa/THELI. It offers numerous and vast improvements. While still being undocumented, users familiar with v2 will find it easy to switch to v3. For any questions please contact schirmer[at]mpia.de .

THELI GUI (outdated)

Version:2.10.5 Last update:Mar 23, 2018 Latest changes:ChangeLog

THELI is a powerful and easy-to-use package for astronomical image reduction, offering e.g.

• Automated reduction of optical, NIR and MIR data
• 90 pre-configured instruments
• Parallelisation
• Flexible background correction
• Automatic distortion correction and creation of large mosaics
• Highly flexible coaddition: e.g. locking onto proper motion targets, various projections, etc
• Optimised weighting schemes and defect detection
• Crosstalk and non-linearity correction
• Atmospheric transparency correction
• Absolute flux calibration
• Extensive documentation and online help

Help

• Looking for something, but you don’t know what it is called? Browse the Index.
• Or find it using the Search page.
• THELI is bugging you? Try the THELI trouble-shooter and FAQ.

Content

• 1. Download
• 2. Installation
• 3. Getting started
• 4. Instruments
• 5. Where is what in THELI
• 6. INITIALISE
• 7. PREPARATION
• 8. CALIBRATION
• 9. About background modelling
• 10. BACKGROUND
• 11. WEIGHTING
• 12. ASTROMETRY / PHOTOMETRY
• 13. COADDITION
• 14. Miscellaneous
• 15. Near-IR data reduction
• 16. Advanced usage
• 17. Prepare color image
• 18. Guidelines for visiting observers
• 19. THELI trouble-shooter and FAQ

Acknowledgements

Please cite the following two papers when publishing your scientific work based on THELI:

• Schirmer M. 2013, ApJS, 209, 21: THELI GUI – Convenient reduction of optical, near- and mid-infrared imaging data
• Erben, T., Schirmer, M., Dietrich, J. et al. 2005, AN, 326, 432: GaBoDS: The Garching-Bonn Deep Survey. IV. Methods for the image reduction of multi-chip cameras demonstrated on data from the ESO Wide-Field Imager