Photometry of three open star clusters: Juchert-Saloranta 1, Teutsch 1 and Teutsch 5

Abstract

We present a photometric study for three rarely studied open star clusters; Juchert-Saloranta 1, Teutsch 1 and Teutsch 5 using the 2MASS-JHKs photometric data. Their structural and photometric parameters are determined. We obtained the distance from the Sun of 3.30±0.30 kpc, 3.82±0.25 kpc and 2.91±0.34 kpc and their log(age) of 9.15, 8.75 and 8.9 at solar metallicity and the total mass of 215, 807 and 165 M ⊙ for Juchert-Saloranta 1, Teutsch 1 and Teutsch 5 respectively. The three clusters lie in the galactic plane and about 11 kpc from the galactic center. The relaxation times of the clusters are smaller than the estimated cluster ages (∼0.01) that may be reflect the dynamical relaxation of these clusters.