ハーシェル宇宙望遠鏡
On 22 December, 2012, Ceres occulted the star TYC 1865-00446-1 over parts of Japan, Russia, and China. Ceres' brightness was magnitude 6.9 and the star, 12.2. In 2014, the Herschel Space Observatory found Ceres to possess a tenuous atmosphere of water vapor.