<Tr> <Td_colspan="2"> HCG 92, Arp 319, VV 288, SQ </Td> </Tr> <Tr> <Td_colspan="2"> See also: Galaxy groups, Galaxy clusters, List of galaxy clusters </Td> </Tr> <P> Stephan's Quintet is a visual grouping of five galaxies of which four form the first compact galaxy group ever discovered . The group, visible in the constellation Pegasus, was discovered by Édouard Stephan in 1877 at the Marseille Observatory . The group is the most studied of all the compact galaxy groups . The brightest member of the visual grouping is NGC 7320 that is shown to have extensive H II regions, identified as red blobs, where active star formation is occurring . </P> <P> Four of the five galaxies in Stephan's Quintet form a physical association, Hickson Compact Group 92, and will likely merge with each other . Radio observations in the early 1970s revealed a mysterious filament of emission which lies in inter-galactic space between the galaxies in the group . This same region is also detected in the faint glow of ionized atomic hydrogen seen in the visible part of the spectrum as a green arc . </P>

Which constellation is home to the stephan's quintet