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99942 Apophis (provisional designation 2004 MN 4) is a near-Earth asteroid and a potentially hazardous object, 450 metres (1,480 ft) by 170 metres (560 ft) in size, [3] that caused a brief period of concern in December 2004 when initial observations indicated a probability of 2.7% that it would hit Earth on Friday, April 13, 2029.
Size comparison of 2024 YR 4 and other notable meteoroids, ... behind 99942 Apophis which briefly ranked Torino scale level 4 in late 2004. [19]
The only objects on the Torino scale that have ever ranked higher are asteroids 99942 Apophis, which had a rating of 4 for four days in late 2004, the highest recorded rating, (144898) 2004 VD 17, with a historical rating of 2 from February to May 2006, and 2024 YR 4, with a rating of 3 from 27 January 2025 that is valid as of 8 February 2025.
The larger in size asteroids or other near-Earth objects ... (for comparison, ... more accurate observations of 99942 Apophis, combined with the recovery of ...
In a bit of ominous news befitting a Friday the 13th: It turns out that the asteroid Apophis could have a very small chance of colliding into Earth in five years, when it is expected to make a ...
99942 Apophis: 0.3: June 19, 2004: First asteroid to rank greater than one on the Torino Scale (it was ranked at 2, then 4; now down to 0). Previously better known by its provisional designation 2004 MN 4. 152830 Dinkinesh I Selam: 0.22: November 1, 2023: First satellite discovered to be a contact-binary (433953) 1997 XR 2: 0.23: December 4, 1997
On December 24, 2004, 370 m (1,210 ft) asteroid 99942 Apophis (at the time yet unnamed and therefore known only by its provisional designation 2004 MN 4) was assigned a 4 on the Torino scale, the highest rating given to date, as the information available at the time translated to a 1.6% chance of Earth impact in April 2029. [92]
A second example was the 2013 ESA Herschel Space Observatory follow-up observations of 99942 Apophis, which showed it was 20% larger and 75% more massive than previously estimated. [65] However such follow-ups are rare. The size estimates of most near-Earth asteroids are based on visible light only. [66]