We present a distance measurement for the semiregular variable S Crateris ( S Crt ) based on its annual parallax .
With the unique dual beam system of the VLBI Exploration for Radio Astrometry ( VERA ) telescopes , we measured the absolute proper motion of a water maser spot associated with S Crt , referred to the quasar J1147 - 0724 located at an angular separation of 1.23 ^ { \circ } .
In observations spanning nearly two years , we have detected the maser spot at the LSR velocity of 34.7 km s ^ { -1 } , for which we measured the annual parallax of 2.33 \pm 0.13 mas corresponding to a distance of 430 ^ { +25 } _ { -23 } pc .
This measurement has an accuracy one order of magnitude better than the parallax measurements of HIPPARCOS .
The angular distribution and three-dimensional velocity field of maser spots indicate a bipolar outflow with the flow axis along northeast-southwest direction .
Using the distance and photospheric temperature , we estimate the stellar radius of S Crt and compare it with those of Mira variables .