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Here we show the preliminary results of a photometric study of low surfacebrightness objects with $\mu_{g'}~\gtrsim~25$~mag/arcsec$^2$. These objects arepresent in several fields obtained with GEMINI-GMOS, in the central region ofthe Pegasus I group. We found that their photometric characteristics aresimilar to the so-called dwarf spheroidal galaxies or to the ultra low surfacebrightness galaxies.

Propiedades fotom\'etricas de las galaxias enanas de bajo brillo superficial en la zona central del grupo Pegasus I