Posts Tagged ‘space’

Stonehenge Solstice

NASA Astronomy Picture of the Day for 6.21.2010
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Cosmos

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Couple of near misses…

About a week ago and again Nov. 6 there were asteroids that came really close to Earth. One, ~10 meters wide, exploded over Indonesia on 10/8/09. Here’s more from spaceweather.com:

INDONESIAN ASTEROID: Picture this: A 10-meter wide asteroid hits Earth and explodes in the atmosphere with the energy of a small atomic bomb. Frightened by thunderous sounds and shaking walls, people rush out of their homes, thinking that an earthquake is in progress. All they see is a twisting trail of debris in the mid-day sky:


Click to view an Indonesian news report

This really happened on Oct. 8th around 11 am local time in the coastal town of Bone, Indonesia. The Earth-shaking blast received remarkably little coverage in Western press, but meteor scientists have given it their full attention. “The explosion triggered infrasound sensors of the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) more than 10,000 km away,” report researchers Elizabeth Silber and Peter Brown of the Univ. of Western Ontario in an Oct. 19th press release. Their analysis of the infrasound data revealed an explosion at coordinates 4.5S, 120E (close to Bone) with a yield of about 50 kton of TNT. That’s two to three times more powerful than World War II-era atomic bombs.

The asteroid that caused the blast was not known before it hit and took astronomers completely by surprise. According to statistical studies of the near-Earth asteroid population, such objects are expected to collide with Earth on average every 2 to 12 years.

Then another newly discovered asteroid, ~7 meters wide, made the closest pass (about 8700 miles from Earth’s surface) of any but two others, becoming the third closest asteroid on record.
ASTEROID NEAR MISS: On Nov. 6th at 2132 UT, asteroid 2009 VA barely missed Earth when it flew just 14,000 km above the planet’s surface. That’s well inside the “Clarke Belt” of geosynchronous satellites. If it had hit, the ~6-meter wide space rock would have disintegrated in the atmosphere as a spectacular fireball, causing no significant damage to the ground. 2009 VA was discovered just 15 hours before closest approach by astronomers working at the Catalina Sky Survey.

Keep your eyes on the skies! It’s very active right now, and these beauties were previously unknown. Technorati Tags: , , , ,

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