 The rotation period of Ceres ( the Cererian day ) is 9 hours and 4 minutes . It has a small axial tilt of 4 ° . This is nevertheless large enough for Ceres 's polar regions to contain permanently shadowed craters that are expected to act as cold traps and accumulate water ice over time , similar to the situation on the Moon and Mercury . About 0 @.@ 14 % of water molecules released from the surface are expected to end up in the traps , hopping an average of 3 times before escaping or being trapped . 
 The rotation period of Ceres ( the Cererian day ) <a href='drop_aux' title='1'><mark>is</mark></a>9 hours and 4 minutes . It <a href='got' title='2'><mark>has</mark></a> a small axial tilt of 4 ° . This <a href='drop_aux' title='3'><mark>is</mark></a>nevertheless large enough for Ceres <a href='null_genetive' title='4'><mark>'s</mark></a>polar regions to contain permanently shadowed craters <a href='null_relcl' title='5'><mark>that</mark></a>are expected to act as cold traps and accumulate water ice over time , similar to the situation on the Moon and Mercury . About 0 @.@ 14 % of water molecules released from the surface are expected to end up in the traps , hopping an average of 3 times before escaping or being trapped . 
The rotation period of Ceres ( the Cererian day ) 9 hrs and 4 minutes . It got a small axial tilt of 4 ° . This nevertheless bigass enough fa Ceres  polar regions to contain permanently shadowed craters r expected to act as cold traps and accumulate water ice over time , similar to the shii on da Moon and Mercury . About 0 @.@ 14 % of water molecules released from tdasurface arrxpected to end up in thdaraps , hopping an average of 3 times b4 escaping or being trapped .