UDFy-38135539
UDFy-38135539 (also known as "HUDF.YD3") is the Hubble Ultra Deep Field (UDF) identifier for a galaxy which was calculated as of October 2010 to have a light travel time of 13.1 billion years with a present proper distance of around 30 billion light-years. It was discovered by three teams in September 2009 in sensitive infrared Hubble Space Telescope images and identified by these as source UDF-38135539 (R Bouwens et al.), source HUDF.YD3 (A Bunker et al.) and source 1721 (R McLure et al.), and additionally reported in the Astrophysical Journal, and the Monthly Notices of the Royal Astronomical Society.