The newly-discovered asteroid 2021 PH27 has a diameter of about 1 km (3,280 feet) and orbits the Sun in just 113 days — the shortest known orbital period for an asteroid and second shortest for any object in our Solar System after Mercury. The asteroid 2021 PH27 was imaged inside Mercury’s orbit and has been colored red and blue to show the two different times where it was imaged on August 13, 2021 — just three minutes apart. Image credit:...
