Simplify the following text for a Grade 3 native English-speaking person.
Original: Its discovery was announced by Scott S. Sheppard , David C. Jewitt , Jan Kleyna , and Brian G. Marsden on June 26 , 2006 from observations taken between January and April 2006 .
Simplified: It was discovered by Scott S. Sheppard , David C. Jewitt , Jan Kleyna , and Brian G. Marsden on June 26 , 2006 .