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We report on the H2O maser distributions around IRAS 22480+6002 (=IRC+60370)observed with the Japanese VLBI Network (JVN) at three epochs spanning 2months. This object was identified as a K-type supergiant in 1970s, which wasunusual as a stellar maser source. The spectrum of H2O masers consists of 5peaks separated roughly equally by a few km/s each. The H2O masers werespatially resolved into more than 15 features, which spread about 50 mas alongthe east--west direction. However, no correlation was found between the propermotion vectors and their spatial distributions; the velocity field of theenvelope seems random. A statistical parallax method applied to the observedproper-motion data set gives a distance of 1.0+-0.4 kpc for this object, thatis considerably smaller than previously thought. The distance indicates thatthis is an evolved star with L~5800 Lsun. This star shows radio, infrared, andoptical characteristics quite similar to those of the population II post-AGBstars such as RV Tau variables.

JVN observations of H2O masers around the evolved star IRAS 22480+6002