2020 LD

2020 LD is an Apollo near-Earth asteroid roughly 140 m in diameter. It was discovered on 7 June 2020 when the asteroid was about 0.03 AU from Earth and had a solar elongation of 154 degrees. The glare of the Sun had masked the approach of the asteroid since November 2019. The asteroid passed closest approach to Earth on 5 June 2020 at a distance of 0.002 AU. The close approach distance is now known with an accuracy of roughly ±&thinsp;1000 km. This is the largest asteroid to pass closer than the Moon this year and possibly the largest since in November 2011. The asteroid makes close approaches to Mercury, Venus, Earth, and Mars. It will be brighter than apparent magnitude 24 until 18 July 2020.

With a short 6 day observation arc it was possible that the asteroid had passed 0.00008 AU from Earth in June 1918 or would pass 0.0001 AU from Venus in April 2024.

With a 11-day observation arc, the Sentry Risk Table lists a 1 in 9 million chance of impact on 7 June 2109.

is another similarly sized asteroid whose close approach will not be masked by the Sun this year.

Recent 100m asteroids passing inside lunar distance
Very few asteroids have known sizes or shapes. The albedo (how reflective the surface is) of these asteroids is often unknown and therefore only generic assumptions can be made about their sizes. A smaller more reflective asteroid can have the same absolute magnitude (H) of a larger less reflective asteroid.