Abstract
Accurate comparison of photometric data acquired by different telescopes and instruments requires the transformation of the magnitudes to the same photometric system. In this paper, I derived color transformation coefficients to convert the magnitudes observed with the Nishiharima Infrared Camera (NIC) equipped on the Cassegrain focus of the Nayuta telescope to the Two Micron All Sky Survey (2MASS) system, which has become the de facto standard system in the near-infrared. I was able to derive the color transformation coefficients using sources with a wide range of colors since the sample contains very red sources affected by strong interstellar extinction in the Galactic plane. As a result, the conversion coefficients are small, and it is confirmed that the NIC and 2MASS photometric systems are similar.
