<Tr> <Th> Apparent magnitude </Th> <Td> 19.7 to> 27.5 </Td> </Tr> <Tr> <Th> Absolute magnitude (H) </Th> <Td> 7001220799999999999 ♠ 22.08 ± 0.445 </Td> </Tr> <P> ʻOumuamua (/ oʊ ˈmuːəˈmuːə / (listen)) is the first known interstellar object to pass through the Solar System . Formally designated 1I / 2017 U1, it was discovered by Robert Weryk using the Pan-STARRS telescope at Haleakala Observatory, Hawaii, on 19 October 2017, 40 days after it passed its closest point to the Sun . When first seen, it was about 33,000,000 km (21,000,000 mi; 0.22 AU) from Earth (about 85 times as far away as the Moon), and already heading away from the Sun . Initially assumed to be a comet, it was reclassified as an asteroid a week later, and finally (6 November 2017) as the first of the new class of interstellar object . </P> <P> ʻOumuamua is a small object, estimated to be about 230 by 35 meters (800 ft × 100 ft) in size . It has a dark red color, similar to objects in the outer Solar System . ʻOumuamua showed no signs of a comet tail despite its close approach to the Sun, and has significant elongation and rotation rate, so it is thought to be a metal - rich rock with a relatively high density . ʻOumuamua is tumbling rather than smoothly rotating, and it is moving so fast relative to the Sun that there is no chance it originated in the Solar System . It also means that ʻOumuamua cannot be captured into a solar orbit, so it will eventually leave the Solar System and resume traveling in interstellar space . ʻOumuamua's system of origin and the amount of time it has spent traveling amongst the stars are unknown . </P>

The origin of interstellar asteroidal objects like 1i/2017 u1
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