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Spaceship Oumuamua



 
 
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  #11  
Old July 10th 18, 06:40 AM posted to sci.astro.research
jacobnavia
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Posts: 100
Default Spaceship Oumuamua

Le 09/07/2018 * 20:42, Eric Flesch a écrit*:
For interstellar travel, the Sun itself can be used for a slingshot
assist for (say) travelling outwards in the Galactic disk. The key
question, I think, is whether the object approached on a similar
vector as the Sun's but travelling a bit faster so as to catch up to
the Sun..


Obviously I thought about that. But wait...

The problem of spaceship Oumuamua is that is... VERY slow. It takes
thousands and thousands of years for a hop. At 38 Km sec, it takes 7894
years to make a single light year. Stars are about 5 or 6 ly from each
other, so each hop takes around 40 000 years.

You rather be patient in such a spaceship.

The oldest living being on earth (a pine tree in California) has around
5 000 years. Bacterial spores can survive 30 000 years (Wikipedia).
Living beings adapted to such an environment as this piece of rock could
do it, maybe.

There could be beings that arrive to steer their rock by outgassing a
collimated beam of 340g of material, as R. D. Saam calculated.

But that is total speculation. Fact is, as a spacehip it is not very
fast. Faster than anything we can achieve now, but not fast enough for
an interstellar spaceship.

I think we will come back to it in some years.

A fast machine will start from earth and catch up with it. And resolve
its mystery.
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  #12  
Old November 3rd 18, 09:35 PM posted to sci.astro.research
jacobnavia
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Default Spaceship Oumuamua

Oumuamua wasn't a "traditional" spaceship but it is a solar sail.

https://arxiv.org/pdf/1810.11490.pdf

This point of view is proposed by reearchers Shmuel Bialy and Prof.
Abraham Loeb.

Oumuamua would be then, a thin (1mm) sheet designed to reflect as much
as possible solar radiation. This would explain the acceleration that we
see as it leaves us.

[Moderator's note: They discuss a "width" of 0.3--0.9 mm for the sheet.
I would use "thickness" here. -P.H.]

  #13  
Old November 9th 18, 04:35 AM posted to sci.astro.research
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Default Spaceship Oumuamua

On Thursday, June 28, 2018 at 5:13:18 PM UTC-4, jacobnavia wrote:
Oumuamua is leaving us at high speed.

snip
Easily explained.

Earth is a local stop; Oumuamua is long-distance (LD) express
(like Amtrak). Probably had a stop not too far back and is
now accelerating to it's next station.

And, unlike Rama, Oumuamua's spin (tumbling) period seems to be a
lot longer than 4 minutes.
-- jt]]

That's how you know it's an LD express.

mj horn
 




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