Observations of the highly isolated dwarf spheroidal galaxy KKs 3 = [ KK2000 ] 03 with the Hubble Space Telescope ( HST ) Advanced Camera for Surveys ( ACS ) are presented .
We measured the galaxy distance of 2.12 \pm 0.07 Mpc using the Tip of Red Giant Branch ( TRGB ) method .
The total blue absolute magnitude of the galaxy is estimated as M _ { B } = -10.8 mag .
We briefly discuss the star formation history of KKs 3 derived from its colour-magnitude diagram .
According to our calculation , the total stellar mass of the galaxy is 2.3 \times 10 ^ { 7 } M _ { \odot } , and most stars ( 74 % ) were formed at an early epoch more than 12 Gyr ago .
A full description of the properties of the colour-magnitude diagram requires some extension of star formation in metallicity and age .