We present Hubble Space Telescope WFPC2 imaging of the nearby low-surface-brightness dwarf spheroidal galaxy ESO 410-G005 , which has been resolved into stars for the first time .
The resulting color-magnitude diagram for about 2500 stars shows a red giant branch with a tip at I = 22 \fm 4 \pm 0 \fm 15 , which yields a distance of D _ { MW } = 1.9 \pm 0.2 Mpc .
ESO 410-G005 is found to be metal-poor with a mean metallicity of \langle [ Fe/H ] \rangle = ( -1.8 \pm 0.4 ) dex estimated from its red giant branch .
Upper asymptotic giant branch stars appear to be present near the center of the galaxy , indicative of a substantial , centrally concentrated intermediate-age population , unless these objects are artifacts of crowding .
Previous studies did not detect ESO 410-G005 in H \alpha or in H i .
Based on our distance estimate , ESO 410-G005 is a probable member of the Sculptor group of galaxies .
Its linear separation from the nearest spiral , NGC 55 , is 230 kpc on the sky .
The deprojected separation ranges from 340 to 615 kpc depending on the assumed distance of NGC 55 .
The deprojected distance from the Sculptor group spiral NGC 300 is ( 385 \pm 200 ) kpc .
ESO 410-G005 appears to be a relatively isolated dSph within the Sculptor group .
Its absolute magnitude , M _ { V, 0 } = ( -12 \fm 1 \pm 0 \fm 2 ) mag , its central surface brightness , \mu _ { V, 0 } = ( 22.7 \pm 0.1 ) mag arcsec ^ { -2 } , and its mean metallicity , [ Fe / H ] = ( -1.8 \pm 0.4 ) dex follow the trend observed for dwarf galaxies in the Local Group .