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The asteroid 2007 WD5 was reported as having a 1 in 75 chance of hitting Mars on January 30, 2008. This was based on observations through December 21, 2007. New observations are in.
It's predicted path is getting closer to Mars. The media won't run another story until NASA makes another press release, but the updated numbers from some additional observations are now available. December 23rd's data shows it is now predicted to pass 17631 km above the Martian surface, more than twice as close as the prediction made with December 21st's data, when the odds of collision were placed at 1 in 75.
This doesn't necessarily mean that the odds of 1 in 75 have improved. I don't know what the error bar is on the new data. Perhaps as well as the asteroid's trajectory moving closer to Mars, the error bar has shrunk enough to confidently exclude a Martian collision. Or perhaps not.
Here's a screenshot from Gravity Simulator showing the asteroid's trajectory:
It's predicted path is getting closer to Mars. The media won't run another story until NASA makes another press release, but the updated numbers from some additional observations are now available. December 23rd's data shows it is now predicted to pass 17631 km above the Martian surface, more than twice as close as the prediction made with December 21st's data, when the odds of collision were placed at 1 in 75.
This doesn't necessarily mean that the odds of 1 in 75 have improved. I don't know what the error bar is on the new data. Perhaps as well as the asteroid's trajectory moving closer to Mars, the error bar has shrunk enough to confidently exclude a Martian collision. Or perhaps not.
Here's a screenshot from Gravity Simulator showing the asteroid's trajectory: