2004 BL86 (357439).
Near Earth astroid estimated 0.5 - 1 Km in diameter. Discovered on 30 January 2004 by Linear.
On 26 January at 16:20 UTC she will pass at 3.1 lunar distances (1.2 million Km) from earth. Then she will leave us for a 200 years until next pass
23/01/2015
Radar images by Nasa
Scientists working with NASA's 230-foot-wide (70-meter) Deep Space Network antenna at Goldstone, California,
have released the first radar images of asteroid 2004 BL86. The images show the asteroid, which made its closest
approach today (Jan. 26, 2015) at 8:19 a.m. PST (11:19 a.m. EST) at a distance of about 745,000 miles (1.2 million
kilometers, or 3.1 times the distance from Earth to the moon), has its own small moon.
The 20 individual images used in the movie were generated from data collected at Goldstone on Jan. 26, 2015.
They show the primary body is approximately 1,100 feet (325 meters) across and has a small moon approximately
230 feet (70 meters) across. In the near-Earth population, about 16 percent of asteroids that are about 655 feet
(200 meters) or larger are a binary (the primary asteroid with a smaller asteroid moon orbiting it) or even triple
systems (two moons). The resolution on the radar images is 13 feet (4 meters) per pixel.
Radar is a powerful technique for studying an asteroid's size, shape, rotation state, surface features and surface
roughness, and for improving the calculation of asteroid orbits. Radar measurements of asteroid distances and
velocities often enable computation of asteroid orbits much further into the future than if radar observations
weren't available.
2004 BL86 (357439) in motion
The asteroid 2004 BL86 (357 439), the night of Jan 25, 2015 3:35 UTC seen through the telescope in Chile.
This asteroid will whiz by Earth on the night of 26 on January 27 at a distance of 3 times the distance Earth-Moon
Each dash is an exposure of 50 seconds, the total duration is 15 minutes, time varies between exposures between 10 and 20 seconds.
Made with 3 sessions on High Mag telescope in Chile in deep mono 3x 4 fits - 03h 01m 18s -74° 12' 54"