Colour image of the edge-on galaxy UGC11859 (centre) obtained with the OSIRIS camera on the Grantecan. In the yellow square, the low surface brightness galaxy GTC-1, highlighting the low surface brightness emission in shades of grey on a white background. The deformations observed in the disc of the galaxy UGC11859 suggest that GTC-1 is a satellite galaxy. Credit: Ossa-Fuentes (University of Valparaiso) / IAC / GTC / NASA Ames.