Oumuamuo

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Oumuamuo

Postby Dougy broon » Mon Feb 12, 2018 8:37 am

Hi everyone I have just watched the sky at night program about oumuamuo and I do not understand it’s trejectory on the tv programme it is shown as a large u shape through our solar system I do not understand how it can be a u shape??? Why isn’t it a mostly straight trajectory’ through our space how can it be a u shape could someone please explain in simple terms that I might be able to understand thanks in advance Douglas
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Re: Oumuamuo

Postby Gfamily2 » Mon Feb 12, 2018 4:10 pm

It has come in from outside the Solar System, effectively starting off travelling in a straight line. As it nears the Sun, its trajectory is affected by the gravitational attraction, and is bent into a hyperbola. The fact that it's a hyperbola rather than an ellipse is how we know it's from outside the Solar System. The exact shape depends on its initial speed of approach and how close to the Sun it gets.
It's not an exact U shape of course, more like a curved V
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Re: Oumuamuo

Postby Aratus » Mon Feb 12, 2018 6:57 pm

Just to put it another way. Oumuamuo's path was a straight line before it came near to the sun. Just like the sun's gravity makes the planets go around in orbits, when Oumuamuo approached the sun, the sun's gravity tried to make it go around in an orbit too. However, Oumuamuo was going too fast for the sun to do that. The best the sun could do was to swing it around. Oumuamuo will resume a straight path once more, (albeit in a different direction), and will never come back towards the sun again.
I use an 11" Celestron SCT (CPC 1100) on an equatorial wedge, housed in a 2.2m Pulsar observatory. I use a ZWO ASI1600MC and Canon 500D for imaging.
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Re: Oumuamuo

Postby Gfamily2 » Mon Feb 12, 2018 10:32 pm

Here's a screen grab from iPlayer showing the difference between the closed orbit of a comet (dotted) and the open orbit of 'Oumuamua (solid).
Image
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Re: Oumuamuo

Postby Dougy broon » Thu Feb 15, 2018 11:15 am

Thanks guys
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