On 3 June 2010 Australian amateur astronomer Anthony Wesley saw a two-second-long flash of light on the disc of Jupiter. He was watching a live video feed from his telescope. In the Philippines, amateur astronomer Chris Go confirmed that he had simultaneously recorded the transitory event on video. Wesley was the discoverer of the now world-famous July 2009 impact.
Astronomers around the world suspected that something significant must have hit the giant planet to unleash a flash of energy bright enough to be seen here on Earth, about 770 million kilometres away. But they didn’t know how just how big it was or how deeply it had penetrated into the atmosphere. Over the past two weeks there have been ongoing searches for the “black-eye” pattern of a deep direct hit like those left by former impactors.
The sharp vision and ultraviolet sensitivity of the Wide Field Camera 3 aboard the NASA/ESA Hubble Space Telescope were used to seek out any trace evidence of the aftermath of the cosmic collision. Images taken on 7 June — just over three days after the flash was sighted — show no sign of debris above Jupiter’s cloud tops. This means that the object didn’t descend beneath the clouds and explode as a fireball. If it had done, then dark sooty blast debris would have been ejected and would have rained down onto the clouds.
