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- 2044 - Oumuamua is needle shaped asteroid ,1,300 feet long, 360 feet diameter, on a long hyperbolic orbit. It is traveling at 58,900 miles per hour. This asteroid came from outside our system. It is on its way back into deep space. Active asteroids or main belt comets could have played a part in making Earth habitable.
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------------------------- 2044 - Oumuamua , the needle shaped asteroid
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-You probably missed it. But, fortunately it missed us too. It was an asteroid named “Oumuamua”. The name is Hawaiian meaning “scout”. The telescope on Maui discovered this asteroid in 2017. In zoomed past us last October just 15 million miles away from an impact. The Moon is 240,000 miles away.
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This needle shaped, metal-rich asteroid , 1,300 feet long, 360 feet diameter, on a long hyperbolic orbit. It is traveling at 58,900 miles per hour. It came to us from another distant two-star system . It was not part of our solar system and was not gravitationally bound to our Sun. It was not a comet because it had no tail and no cloud like coma around its core even after getting close to the Sun.
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This asteroid came from outside our system. Computer modeling indicated that its elongated shape was created in a system of two close orbiting stars. There are a lot of binary star systems in our galaxy, estimated to be over 50% of the stars we find.
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This asteroid completed a long voyage through deep space. Already it has left the view of our most powerful telescopes disappearing from sight mid-December, 2017. Oumuamua is on its way back into deep space. It is the first known interstellar object to visit the solar system. It appears to have come from roughly the direction of the star Vega in that constellation.
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On the pass- by astronomers determined the rotation rate to be one rotation every 7.3 hours. ( 0.00024 radians per second ). That is 3.29 times faster than Earth’s 24 hour rotation rate. ( 24 / 7.3). When it zipped around the Sun in September it reached a maximum speed of 196,200 miles per hour. Today the speed is 58,900 miles per hour and it will take 20,000 years for it to completely leave our Solar System.
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Astronomers would like to sample an asteroid or comet that has survived the past 4.5 billion years in pristine condition. They would like to learn the composition of primordial ice. Several space missions are being planed to do just that.
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Proteus mission to Comet 133P is to launch in 2021.
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OSIRIS-REx mission is to arrive at asteroid Benny in 2018
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As icy comets travel closer to the Sun they form a tail through sublimation with water leaping from ice to gas instantaneously
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Despite Hollywood’s portrayal the asteroid belt is mostly empty space. The average distance between asteroids in the belt is 600,000 miles. These bodies are 4.6 billion years old. They might crash into each other once in 100 million to 1 billion years while the belt hosts some 800,000 of these large rocky bodies.
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Astronomers estimate that interstellar objects similar to Oumuamua pass inside the orbit of Earth every year. And, 10,000 are passing inside the orbit of Neptune on any given day.
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Active asteroids or main belt comets could have played a part in making Earth habitable. When the Earth formed we were too close to the Sun to retain liquid water. It is likely that these asteroids brought water to Earth impacts that occurred much later.
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- OTHER REVIEWS AVAILABLE ABOUT ASTEROIDS:
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1924. How did asteroids and supernovae affect life on Earth? We know we have had these visitors from outer space. The giant crater in the Yucatán Peninsula was a global event that occurred 66,000,000 years ago. It was responsible for annihilating 75% of the living species on Earth.
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The iron in your blood came from a supernova explosion that was created in a Neutron Star, or a Blackhole. An average galaxy size of ours experiences a supernova every 100 years. We are due.
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1923. When will a big asteroid hit the Earth? In 2017 over 50 asteroids have passed us closer than the Moon, inside 240,000 miles.
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1871. In order to predict asteroids trajectories we need to learn about their individual composition. As they approach the Sun gases burn of in different sequences to alter the trajectory. Trojan asteroids occupy gravity balance points 60 degrees ahead and behind Earth’s orbit. Over 6,300 Trojan asteroids have been identified sharing Jupiter’s orbit. Footnote bibliography about Joseph Louis Lagrange.
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1829. It is not the 8 planets in our solar system but the dwarf planets, asteroids and comets that have the most impact on the evolution of life on Earth.
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This Review 1829 also lists 11 more Reviews on asteroids
1825. Does the math for the impact of the asteroid on the Yucatán Peninsula equivalent to 1,500,000 atomic bombs all at once.
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1769. When will the next asteroid hit the Earth?
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1580. Asteroids are the bricks that built up our solar system.
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1554. Asteroids and meteorites are fossils with stories.
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1429. There is an asteroid heading right towards us.
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1375. There is an asteroid following us.
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1309. Vesta and Ceres asteroids get a visit from us.
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1265. This asteroid missed us, but, what if?
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1315. How do asteroids and planets evolve?
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1193. Asteroid to hit Mother Earth.
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937. Spinning asteroid, teachers lesson plan. Using a professional telescope by remote control.
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------------------------- Saturday, March 24, 2018 --------------------------------
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