 Orbiting at an altitude of , less than one quarter of the altitude of geostationary satellites, the O3b satellite constellation of 20 Ka-based satellites significantly reduces communication latency.After initially planning to launch in 2010, the first four satellites were launched on June 25, 2013.A second four satellites were launched in July 2014, and another four in December 2014 bringing the satellite constellation to 12 satellites.