1997 XR2
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 1997 XR2 is an asteroid discovered on December 4, 1997. It has a diameter of 0.1-0.3 km and an estimated mass on the order of 1010 kilograms. From early 2002 to February 24, 2006, 1997 XR2 was considered to have about a 1 in 10,000 chance of colliding with Earth on June 1, 2101, based on 144 observations going back to December of 1997. It was ranked a one on the Torino Scale of impact risk, and was the only near-Earth object to be ranked higher than zero until it was…mehr

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 1997 XR2 is an asteroid discovered on December 4, 1997. It has a diameter of 0.1-0.3 km and an estimated mass on the order of 1010 kilograms. From early 2002 to February 24, 2006, 1997 XR2 was considered to have about a 1 in 10,000 chance of colliding with Earth on June 1, 2101, based on 144 observations going back to December of 1997. It was ranked a one on the Torino Scale of impact risk, and was the only near-Earth object to be ranked higher than zero until it was joined by 2004 VD17 at level one in November 2004, and then when 99942 Apophis was temporarily assessed at level four in December 2004. Currently 2004 VD17 and 99942 Apophis are rated at level zero.