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SH2-188 is a faint planetary nebula visible in the constellation of Cassiopeia.
Although it has been included in the Sharpless Catalog, it is actually a planetary nebula, located 711 light years away from the Solar System. It appears as a well-marked envelope on the eastern side and very dispersed on the western side, where it seems to have already dissolved.
Through its speed of expansion an age of about 7,500 years has been determined.