Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Fenrir or Saturn XLI is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on May 4, 2005, from observations taken between December 13, 2004, and March 5, 2005. It has an apparent magnitude of 25, making it one of the faintest known moons in the solar system, and was discovered using some o ...