Скачать или смотреть What is (29075) 1950 DA Asteroid | Giant asteroid may hit the earth in future

Asteroid (29075) 1950 DA was discovered on 23 February 1950. It was observed for 17 days and then faded from view for half a century. Then, an object discovered on 31 December 2000 was recognized as being the long-lost 1950 DA. (Note this was New Century’s Eve and exactly 200 years to the night after the discovery of the first asteroid, Ceres.)

Radar observations were made at Goldstone and Arecibo on 3-7 March 2001, during the asteroid’s 7.8 million km approach to the Earth (a distance 21 times larger than that separating the Earth and Moon). Radar echoes revealed a slightly asymmetrical spheroid with a mean diameter of 1.1 km. Optical observations showed the asteroid rotated once every 2.1 hours, the second fastest spin rate ever observed for an asteroid its size.
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Detection of A Potential Hazard
When high-precision radar meaurements were included in a new orbit solution, a potentially very close approach to the Earth on March 16, 2880 was discovered to exist. Analysis performed by Giorgini et al. and reported in the April 5, 2002 edition of the journal Science (“Asteroid 1950 DA’s Encounter With Earth in 2880: Physical Limits of Collision Probability Prediction”) determined the impact probability as being at most 1 in 300 and probably even more remote, based on what is known about the asteroid so far. At its greatest, this could represent a risk 50% greater than that of the average background hazard due to all other asteroids from the present era through 2880, as defined by the Palermo Technical Scale (PTS value = +0.17). 1950 DA is the only known asteroid whose hazard could be above the background level.

Credits::
Clips: Pixabay, NASA, ESA, JPL, Shutterstock

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