Initially sparking concern due to its close approach in 2004 and potential impact threat in 2029 or 2036, Apophis remains one of the most closely monitored asteroids due to its size and trajectory.
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This asteroid, the target of NASA's OSIRIS-REx mission, has a small chance of impacting Earth late in the 22nd century, making it a significant focus of study.
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Despite previous concerns about its impact probability, further observations have reduced the risk to effectively zero.
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With a diameter of about 1.1 kilometers, 1950 DA presents a small but non-negligible risk of impact in the distant future, prompting ongoing monitoring efforts.
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Initially classified as a potentially hazardous asteroid, ongoing observations have since ruled out any significant risk of impact in the foreseeable future.
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This asteroid briefly garnered attention for its potential impact in 2185, though subsequent observations have downgraded its threat level.
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While previously listed on NASA's Sentry Risk Table, ongoing monitoring has revealed no significant risk of impact in the near future.
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Despite initial concern about its potential impact in 2095, continued observations have reduced the risk to effectively zero.
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This asteroid made a close approach to Earth in 2017, highlighting the importance of tracking and monitoring even smaller near-Earth objects.
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Apart from Bennu's potential impact threat mentioned earlier, 1999 RQ36 gained attention for its association with the OSIRIS-REx mission.