Keith's note: Larger image. Objects are to scale. But the way that this thing rotates might dictate a more prudent station keeping distance.
First Interstellar Asteroid `Oumuamua is Like Nothing Seen Before, ESO
"Observations from ESO's Very Large Telescope in Chile and other observatories around the world show that this unique object was traveling through space for millions of years before its chance encounter with our star system. It appears to be a dark, reddish, highly-elongated rocky or high-metal-content object."
First Known Interstellar Visitor Is an "Oddball"
"While study of 'Oumuamua's colors shows that this body shares characteristics with both Kuiper Belt objects and organic-rich comets and Trojan asteroids," says Meech, "its orbital path says it comes from far beyond."
An Interstellar Visitor Unmasked, IFA
"Originally denoted A/2017 U1 (with the A for "asteroid"), the body is now the first to receive an "I" (for interstellar) designation from the International Astronomical Union, which created the new category after the discovery. In addition, it has been officially given the name `Oumuamua."
Solar System's First Interstellar Visitor Dazzles Scientists, NASA
"The asteroid, named 'Oumuamua by its discoverers, is up to one-quarter mile (400 meters) long and highly-elongated--perhaps 10 times as long as it is wide. That aspect ratio is greater than that of any asteroid or comet observed in our solar system to date."
Well @Dr_ThomasZ they should have named this #interstellar visitor #Rama. Arthur C. Clarke predicted it ;-) Just sayin' #Oumuamua http://pic.twitter.com/09HGkvbWdJ
— NASA Watch (@NASAWatch) November 20, 2017
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