NANTEN2 sub-mm observatory

NANTEN2 is a wide field sub-mm/mm observatory equipped with heterodyne receivers at four frequency bands at 100, 200, 500 and 800 GHz. The observatory is locate at 4865m above the sea level in Atacama, Chile and has been in astronomical use since 2005. I summarize the highlights of the recent astronomical results and present on-going project with an emphasis on a study of CMB by a super CO survey NASCO as a collaborative effort with Planck.