Limb Darkening

The limb darkened Sun, with the November 8, 2006, transit of the planet Mercury.

This page provides access to data files containing coefficients for various limb darkening approximations described in Van Hamme, 1993, AJ 106, 2096. Consult this paper for types of coefficients (monochromatic, bandpass-specific) and table format.

The coefficients are based on the stellar atmosphere models of Robert Kurucz, as posted on his Web site (reference date March 2012). The Kurucz models span 19 chemical compositions ([M/H] from -5.0 to +1.0) which are indicated in the file names below using Kurucz’ convention.

In each file, bandpass-integrated coefficients for 93 bands are listed, including band names. References for response curves are in Table 2 of the “Computing Binary Star Observables” booklet by Wilson & Van Hamme (2016), and available here.

Clicking on a file name below loads the file in your browser. Each of the bandpass-specific files is about 3.5 MB in size; gzipped files containing monochromatic coefficients are approximately 10 MB each and archived in the tar file limcof_mono.tar.gz, also accessible below.

A simple interpolation program written in FORTRAN can be downloaded by clicking here. Please read comment lines carefully before using this program.

File requested by Slavek Rucinski: limcof_rucinski_p00.dat

All limcof_bp_*.dat files in one tar file: limcoffiles2016.tar.gz