DECam ugrizY Synthetic Colors

What is DECam?

The Dark Energy Survey is an experiment to probe the accelerating universe, with a goal of obtaining ~300 photometric redshifts to z~1. This survey will be carried out with DECam, a 520 megapixel prime-focus imager on the Blanco 4m telescope at CTIO. It has a field of view of 2.2 degrees(!) and is equipped with SDSS-like ugrizY filters.

Though the filters are similar to SDSS, they are not identical. Since stellar photospheric DECam colors are not yet available, I present Phoenix/NextGen BT-Settl Synthetic DECam ugrizY colors with 2MASS JHKS colors mixed in for good measure. These are the latest-greatest models with Asplund et al. (2009) solar composition, obtained from the Phoenix Group's Website. The DECam colors are computed in the AB system.

Currently I offer a limited Teff-log(g)-[m/H] grid of colors. If you need something that is not here, please send me an email ( and I'll be glad to try and help! I'm not on the DECam or DES team(s), but computed these colors for my own use and I figured I would share.

  • Teff: 2600-50000 K (select models down to 500K)
  • log(g): 3.5, 4.0, 4.5, 5.0 dex
  • [m/H]: -0.5, 0.0, +0.3, +0.5 dex

Download: DECam-2MASS colors


Teff vs. Color for log(g)=4.5 and [m/H]=0.0