• New Nasa images indicate object hit Jupiter

    This image shows a large impact on Jupiter's south polar region captured on 20 July 2009, by Nasa's Infrared Telescope Facility in Mauna Kea, Hawaii. Image credit: Nasa/JPL/Infrared Telescope Facility
    Date:21 July 2009 Tags:,

    Scientists have found evidence that another object has bombarded Jupiter, exactly 15 years after the first impacts by the comet Shoemaker-Levy 9.

    Following up on a tip by an amateur astronomer, Anthony Wesley of Australia, that a new dark “scar” had suddenly appeared on Jupiter in the morning of 20 July between 3 and 9 am PDT (6 am and noon EDT), scientists at Nasa’s Jet Propulsion Laboratory (JPL) in Pasadena, California, using Nasa’s Infrared Telescope Facility at the summit of Mauna Kea, Hawaii, gathered evidence indicating an impact.

    New infrared images show the likely impact point was near the south polar region, with a visibly dark “scar” and bright upwelling particles in the upper atmosphere detected in near-infrared wavelengths, and a warming of the upper troposphere with possible extra emission from ammonia gas detected at mid-infrared wavelengths.

    “We were extremely lucky to be seeing Jupiter at exactly the right time, the right hour, the right side of Jupiter to witness the event. We couldn’t have planned it better,” said Glenn Orton, a scientist at JPL.

    Orton and his team of astronomers kicked into gear early in the morning and haven’t stopped tracking the planet. They are downloading data now and are working to get additional observing time on this and other telescopes.

    This image was taken at 1.65 microns, a wavelength sensitive to sunlight reflected from high in Jupiter’s atmosphere, and it shows both the bright centre of the scar (bottom left) and the debris to its northwest (upper left).

    “It could be the impact of a comet, but we don’t know for sure yet,” said Orton. “It’s been a whirlwind of a day, and this on the anniversary of the Shoemaker-Levy 9 and Apollo (to see the first steps taken on the Moon as people on Earth saw them on TV on 20 July 1969, |click here|) anniversaries is amazing.”

    Shoemaker-Levy 9 was a comet that had been seen to break into many pieces before the pieces hit Jupiter in 1994.

    Leigh Fletcher, a Nasa postdoctoral fellow at JPL who worked with Orton during these latest observations said, “Given the rarity of these events, it’s extremely exciting to be involved in these observations. These are the most exciting observations I’ve seen in my five years of observing the outer planets!”

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