National Aeronautics and Space Administration (NASA) on alert as huge asteroid 2015 TB145 set to skim past Earth at 78,000mph. According to NASA’s Near Earth Object Programme, the enormous lump of rock will pass within 300,000 miles (1.3LD) (a tiny distance in astronomical terms) of Earth on October 31. During closest approach to Earth the asteroid will reach about apparent magnitude 10, and will be observable to amateur astronomers with small telescopes. At peak brightness, it will be best seen in the Northern hemisphere. The asteroid was first observed on 10 October 2015 by Pan-STARRS at an apparent magnitude of 20 using a 1.8-meter Ritchey-Chretien telescope. On October 31, 2015 the asteroid will pass about 0.0019 AU (280,000 km; 180,000 mi) from the Moon and then pass about 0.0032 AU (480,000 km; 300,000 mi) from Earth. It is approaching at exceptionally high speed, about 35 kilometers per second, or ~126,000 km/hr. The greatest concern with this large asteroid is its orbit. Astronomers are still unclear as to the exact orbit of the asteroid, which currently has an orbital Uncertainty Parameter U of 9 MPC “U” parameter orbit uncertainty estimate 0-9, with 0 being good, and 9 being highly uncertain. This asteroid is not yet on NASA public tables and there is no info about its size.
Credit: nemesis maturity