Its discovery was announced by Scott S. Sheppard , David C. Jewitt , Jan Kleyna , and Brian G. Marsden on April 13 , 2007 , from observations taken between January 5 , 2006 and March 22 , 2007 . Its discovery was announced by Scott S. Sheppard , David C. Jewitt , Jan Kleyna , and Brian G. Marsden on April 13 , 2007 , from observations taken between January 5 , 2006 , and March 22 , 2007 .