The Grus trio is sometimes considered as a quartet if we include NGC 7552 which in this case is visible in the top left on the image. There are not much images of this group and even less if we include the possible forth member. The three centred galaxies are quite bright and there are confronted in a 16 arc minutes field while NGC 7552 is relative separated by 27 arc minutes. The group have a strong interaction. The high starburst activity of two of the members, NGC 7552 and NGC 7582 (centre top), is also thought to arise from tidal galaxy interactions and subsequent formation of a bar in the disk.
The image was taken with a 6 inches f5 Orion Optics UK Newtonian and a QSI 583 WS camera riding in a SW NEQ6 Mount, 150 km north from Buenos Aires City, Argentina. The exposure time amount to three hours through Baader LRGB filters.