On August 20th at 18:22 UT, amateur astronomer Masayuki Tachikawa of Kumamoto city, Japan, video-recorded an apparent impact on Jupiter. This is the third time in only 13 months that amateur astronomers have detected signs of impact on Jupiter. The earlier events occured on July 19, 2009, and June 3, 2010. Jupiter is getting hit more often than conventional wisdom would suggest, leading many researchers to call for a global network of telescopes to monitor Jupiter 24/7 and measure the impact rate. "Like the event of June 3rd, this fireball did not produce any visible debris," notes John Rogers, director of the British Astronomical Association’s Jupiter section. "Here are some hi-resolution images taken 1-2 rotations before and 1-2 rotations after the event: www.spaceweather.com As the observers commented, there was no visible mark (not in RGB, nor UV, nor methane), post-impact. Dark brown spots on the North Equatorial Belt were already there before the fireball." Source: www.spaceweather.com