Asteroid 2024 Or1000lcdrm1u. When astronomers discovered 2020 xr, exactly four years ago, they briefly thought it had a small chance of colliding with earth in 2028. Nasa’s goldstone radar in california observed the two large asteroids that passed earth in late june.
A tiny asteroid measuring some 27 inches (70 cm) wide was detected on a collision course with earth above siberia. (415029) 2011 ul21 2011 ul21 was discovered in october 2011 by the catalina sky survey, although precovery observations from palomar date back to october 1989.