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1994 CC was discovered by Spacewatch's Jim Scotti at Kitt Peak National Observatory on 3 February 1994. [2] In June 2009 it was shown to be a triple system, i.e. the largest body is orbited by two satellites; only about one percent (1%) of near-Earth asteroids observed by a radar are found to be triple systems such as this one. [9]
98943 Torifune (provisional designation 2001 CC 21) is a stony near-Earth asteroid of the Apollo group, with a diameter of about 500 metres (1,600 feet). It was discovered by the Lincoln Near-Earth Asteroid Research (LINEAR) survey at Socorro, New Mexico on 3 February 2001. [ 1 ]
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Below is the list of predicted close approaches of near-Earth asteroids larger than magnitude 27, that were predicted to occur in 2021. [ note 1 ] This relates to the effectiveness of asteroid cataloging systems at predicting close approaches in 2021.
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As of December 2024, all of the asteroids with predicted impacts were under 10 m (33 ft) in size that were discovered just hours before impact, and burned up in the atmosphere as meteors. Asteroid designation
A newly discovered asteroid named 2024 YR4 now has a 2.2% chance of affecting Earth in 2032 after recent observations.
Outside the top four, the ranking of all the asteroids is uncertain, as there is a great deal of overlap among the estimates. The largest asteroids with an accurately measured mass, because they have been studied by the probe Dawn, are 1 Ceres with a mass of (939.3 ± 0.5) × 10 18 kg, and 4 Vesta at (259.076 ± 0.001) × 10 18 kg.