As part of preparations for a southern sky search for faint Milky Way dwarf galaxy satellites , we report the discovery of a stellar overdensity in the Sloan Digital Sky Survey Data Release 5 , lying at an angular distance of only 1.5 degrees from the recently discovered Boötes dwarf .
The overdensity was detected well above statistical noise by employing a sophisticated data mining algorithm and does not correspond to any catalogued object .
Overlaid isochrones using stellar population synthesis models show that the color-magnitude diagram of that region has the signature of an old ( 12 Gyr ) , metal-poor ( { Fe / H } \approx - 2.0 ) stellar population at a tentative distance of 60 kpc , evidently the same heliocentric distance as the Boötes dwarf .
We estimate the new object to have a total magnitude of M _ { V } \sim - 3.1 \pm 1.1 mag and a half-light radius of r _ { h } = 4 ^ { \prime } .1 \pm 1 ^ { \prime } .6 ( 72 \pm 28 pc ) placing it in an apparent 40 < r _ { h } < 100 pc void between globular clusters and dwarf galaxies , occupied only by another recently discovered Milky Way Satellite , Coma Berenices .