https://www.nytimes.com/2024/06/27/science/asteroid-earth-nasa.html

An asteroid the size of 2024 MK threading this celestial needle is less common. “Passes this close by things this big are rare but happen on decadal timescales — this will be the third (that we know of) this century,” Dr. Rivkin said in an email.

Anyone that fails to spot 2024 MK need not feel left out for too long. On April 13, 2029, Apophis, a 1,100-foot-long asteroid, will fly less than 20,000 miles above Earth’s surface, closer than the orbits of geosynchronous satellites — meaning it will be visible to the naked eye.

(http://www.autoadmit.com/thread.php?thread_id=5546028&forum_id=2#47781881)

Until 2006, a small possibility nevertheless remained that, during its 2029 close encounter with Earth, Apophis would pass through a gravitational keyhole of no more than about 800 kilometres (500 mi) in diameter,[11][12] which would have set up a future impact exactly seven years later on April 13, 2036. This possibility kept it at Level 1 on the Torino impact hazard scale until August 2006, when the probability that Apophis would pass through the keyhole was determined to be very small and Apophis's rating on the Torino scale was lowered to zero. By 2008, the keyhole had been determined to be less than 1 km wide.[11] During the short time when it had been of greatest concern, Apophis set the record for highest rating ever on the Torino scale, reaching level 4 on December 27, 2004.[13]

https://en.wikipedia.org/wiki/99942_Apophis

(http://www.autoadmit.com/thread.php?thread_id=5546028&forum_id=2#47781889)

Although more are discovered every year, most near-Earth asteroids capable of destroying a city are yet to be found. Fortunately, many more may be spotted by a pair of telescopes that are under construction — the multipurpose Vera C. Rubin Observatory in Chile, and NASA’s Near-Earth Object Surveyor spacecraft.

The 2024 MK asteroid is at least twice the length of the Tunguska impactor. It is certainly welcome that the asteroid was found before its encounter with Earth, and that it will miss us. But astronomers just discovered the space rock on June 16.

“The case of 2024 MK is yet another reminder about the fact that there are a lot of large objects still to be found,” Dr. Cano said. Space agencies have the plans, and technology, to defend the planet from killer asteroids — but only if they find them before the asteroids find us.

(http://www.autoadmit.com/thread.php?thread_id=5546028&forum_id=2#47782287)