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We report the detection of a faint old stellar system at$(\alpha,\delta)=(194.29^\circ,~34.32^\circ)$ (SDSS J1257+3419), based on thespatial distribution of bright red-giant branch stars in the Sloan Digital SkySurvey Data Release 4. SDSS J1257+3419 has a half-light radius of $38\pm 12$ pcand an absolute integrated $V$-magnitude of $M_V=-4.8^{+1.4}_{-1.0}$ mag at aheliocentric distance of $150\pm 15$ kpc. A comparison between SDSS J1257+3419and known Galactic halo objects suggests that SDSS J1257+3419 is either (a) afaint and small dwarf galaxy or (b) a faint and widely extended globularcluster. In the former case, SDSS J1257+3419 could represent an entity of apostulated subhalo of the Milky Way. Further photometric and dynamical study ofthis stellar system is vital to discriminate these possibilities.Comment: 7pages, 3 figures, accepted by Astrophysical Journal Lette

Discovery of a Faint Old Stellar System at 150 kpc