SN UDS10Wil (SN Wilson)[4] is a type Ia supernova, and as of April 2013, the farthest known.
[5] It has a redshift of 1.914, which strongly implies that it exploded when the universe was about a third of its current size.
It was discovered with the Hubble Space Telescope's Wide Field Camera 3.
[1] The nickname SN Wilson is after the American President Woodrow Wilson.
[6]