K07W05D 2007 WD5 (Q=4.029 AU, arc=15 days, H=24.3 ~47m) from the Spacewatch 1.8m telescope (Dec. 4.22p1)
http://uk.news.yahoo.com/skynews/20071221/twl-giant-asteroid-2007-wd5-set-to-ploug-3fd0ae9_1.html
Giant Asteroid 2007 WD5 Set To Plough Into Planet Mars
By Sky News SkyNews - Friday, December 21 10:55 amMars could be struck by a massive asteroid, experts have warned.
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Scientists say there is now a 1 in 75 chance the huge chunk of rock could slam into the red planet next month.
They had initially placed odds of a direct hit at 1 in 350.
"These odds are extremely unusual," said Steve Chesley, an astronomer with the Near Earth Object Programme at NASA's Jet Propulsion Laboratory.
"We frequently work with really long odds when we track threatening asteroids."
If a collision does take place, the explosion that follows could be like the famous 1908 Tunguska incident.
That blast, in central Siberia, wiped out 60 million trees and unleashed the energy equivalent to a 15-megaton nuclear bomb.
The new asteroid, known as 2007 WD5, was discovered last month and is similar in size to the Tunguska object.
我想这个级别的撞击地面很难看到
按照陨石坑为撞击物体直径的２０倍计算，火星上最多新形成一个５００－１０００米的坑，在月球上都很难观测，别说火星了，我们只能期待撞击发生在对着地球的这一面，并能激起足够规模的尘暴，当然，如果正还撞击在火星对着地球这面的阴影内，也许能观测到闪光．
[ 本帖最后由 suhuasky 于 2007-12-21 22:28 编辑 ] |
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