According to Official Guinness Records,
The highest resolution 3D planetarium is the planetarium of the Macao Science Center, Macau, which uses 12 projectors to give an equivalent resolution of 8,000 x 8,000 pixels in 3D. The planetarium’s dome has a diameter of 15.24 m, tilted at 15 degrees and can seat 139 people. It was opened on 19 December 2009.
For a complete list of 2010 records, please visit 2010 Guinness Records in China.