radio-telescope station IE613, one of some 50 similar stations in Europe, was constructed in the grounds of the castle. This is the westernmost station in the LOFAR network. LOFAR makes observations in the 10 MHz to 240 MHz frequency range with two types of antennas: Low Band Antenna (LBA) and High Band Antenna (HBA), optimized for 10-80 MHz and 120-240 MHz respectively. The Birr Castle station consists of 96 LBA's and 96 HBA's and a total of 96 digital Receiver Units (RCU's). The Birr Castle station on its own is the Irish Low Frequency Array (I-LOFAR) I-Lofar telescope. In 2018, I-LOFAR observed for the first time a billion-year-old red-dwarf, flare star, namely CN Leo (Wolf 359), 7.9 light years away. Pictures See also List of largest optical telescopes historically Craig telescope (refracting telescope of the 1850s) List of largest optical telescopes in the British Isles List of largest optical telescopes of the 19th century Lists of telescopes References Further reading Patrick Moore (1981). The Astronomy of Birr Castle. The Tribune Printing and Publishing Group, Birr. Patrick Moore (1997). "The Leviathan Reborn". Sky & Telescope, 94.5, p. 52. D.H. Levy (2004). "Miracle at Birr Castle". Sky & Telescope, 107.1, p. 84. Wolfgang Steinicke. "William Parsons, 3rd Earl of Rosse". Retrieved 22 November 2009. WGBH NOVA/Time-Life Video "Beyond the Milky Way". Interviews the 7th Earl of Rosse, gives the history of the Leviathan and how it worked, starting at 1:50 Astronomical observatories in the Republic of Ireland Buildings and structures in Birr, County Offaly Optical telescopes