At long last, we have visual evidence of the 2008 TC3 impact over the remote Sudanese skies. Admittedly, it’s not a video of the dazzling fireball ploughing though the upper atmosphere, before detonating with the energy of a small nuclear weapon, but it is a great picture of the smoky remnant after the explosion.
The meteorite train seen in the image above has been sheared and twisted by high altitude winds, leaving the snake-like pattern suspended in the air. The tenuous debris reflects the dawn sunlight, in a not-so-dissimilar way to the noctilucent cloud produced after a rocket launch (pictured left).
Rocks are being thrown at us, but we haven’t noticed
On October 7th, a small asteroid called 2008 TC3 exploded in the skies above Sudan. On October 9th, a metre-wide asteroid named 2008 TS26 buzzed Earth’s atmosphere by only 7000 km. Then on the 21st (Tuesday) a slightly bigger piece of rock called 2008 US missed us by 25,000 km. It sounds like it’s getting dangerous out there, especially when considering the last recorded object (2004 FU162) to come screaming past the Earth (at 6500 km) happened in 2004.
There may not be any ground-based imagery of the 1.1-2.1 kT fireball after asteroid 2008 TC3 hit the Earth’s upper atmosphere above Sudan, but we now have the first satellite observation of the impact. 2008 TC3 (a.k.a. “Brian” as I lovingly named it in my previous post) hit at 02:43am (UTC) yesterday morning, three minutes before the predicted re-entry. This is a huge moment for asteroid hunters: 2008 TC3 is the first ever asteroid to be discovered and accurately forecast to hit our planet.
The above image was taken by the weather satellite Meteosat 8, as Jiri Borovicka of the Czech Academy of Sciences explains: “The explosion was visible in all 12 of the satellite’s spectral channels, covering wavelengths from 0.5 to 14 microns,” he said. “The satellite takes pictures every five minutes; the fireball appeared at 0245 UTC and had faded away by 0250 UTC.”
2008 TC3 wasn’t a particularly interesting asteroid. It wasn’t very big (only 1-5 metres wide) and it didn’t really stand out as being special (if it was special, we didn’t have any time to realise it anyway). If 2008 TC3 was in a crowd of other asteroids you wouldn’t have picked it out. In fact, it was that “normal” that it wasn’t named, it just kept its original asteroid designation number. 2008 TC3 was an ordinary piece of space rock in an extraordinary situation.
A newly discovered asteroid called 2008 TC3 will (with a 99.8-100% probability) hit the atmosphere over northern Sudan at 2:46 UTC (Oct 7th). The piece of rock will not threaten people or structures on the surface, it is likely to burn up during re-entry as a magnificent “air burst.” Estimates suggest that as 2008 TC3 burns up, it will detonate with an energy of a kiloton of TNT.
2008 TC3 is between 1-5 meters in diameter, so it’s not a threat by any means, but it should create a spectacular display. Usually the bright meteors we observe are generated by debris no bigger than a grain of sand, so this will be a huge astronomical event in comparison. The giant meteor will be visible from eastern Africa travelling very quickly from north-east to south-west and it is expected to create a very long trail as it will enter the atmosphere at a very shallow angle. Continue reading “Small Asteroid 2008 TC3 Will Hit Earth Tonight”