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Detailed observations made by NASA's Hubble Space Telescope have found an answer to the flash of light seen June 3 on Jupiter. It came from a giant meteor burning up high above Jupiter's cloud tops. The space visitor did not plunge deep enough into the atmosphere to explode and leave behind any telltale cloud of debris as seen in previous Jupiter collisions.
Astronomers around the world knew that something must have hit the giant planet to unleash a flash of energy bright enough to be seen 400 million miles (644 million kilometers) away, but they didn't know how deeply it penetrated into the atmosphere. There have been ongoing searches for the "black-eye" pattern of a deep direct hit.
The sharp vision and ultraviolet sensitivity of Hubble's Wide Field Camera 3 were brought to bear on seeking out any trace evidence of the aftermath of the cosmic collision. Images taken June 7, just over 3 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 did, dark sooty blast debris would have been ejected and would have rained down onto the cloud tops, and the impact site would have appeared dark in the ultraviolet and visible images due to debris from an explosion," said Heidi Hammel of the Space Science Institute in Boulder, Colorado. "We see no feature that has those distinguishing characteristics in the known vicinity of the impact, suggesting there was no major explosion and fireball."
Dark smudges marred Jupiter's atmosphere when a series of comet fragments hit Jupiter in July 1994. A similar phenomenon occurred in July 2009 when a suspected asteroid slammed into Jupiter. The latest intruder is estimated to be only a fraction of the size of these previous impactors.
"We suspected for this 2010 impact there might be no big explosion driving a giant plume and, hence, no resulting debris field to be imaged," said Hammel. "There was just the meteor, and Hubble confirmed this."
Australian amateur astronomer Anthony Wesley saw the flash at 4:31 p.m. EDT June 3. He was watching a live video feed of Jupiter from his telescope. In the Philippines, amateur astronomer Christopher Go confirmed that he had simultaneously recorded the transitory event on video.
The two-second-long flash of light in the videos of Jupiter was created by the same physics that causes a meteor (or "shooting star") on Earth. A shock wave generated by ram pressure as the meteor speeds into the planet's atmosphere heats the impacting body to a high temperature, and as the hot object streaks through the atmosphere, it leaves behind a glowing trail of superheated atmospheric gases and vaporized meteor material that rapidly cools and fades in just a few seconds.