First ever Comet Landing: Live Feed

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Re: First ever Comet Landing: Live Feed

Post by Eldorion on Wed Nov 12, 2014 8:58 pm

How many light-seconds away is the comet? I'd imagine that the lag is too great to control the probe manually, but I'm curious how quickly they can send commands based on changing circumstances.
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Re: First ever Comet Landing: Live Feed

Post by Eldorion on Wed Nov 12, 2014 8:59 pm

Oh yeah, and landing on a comet is very cool. Very Happy

Spoiler:
Geddit?
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Re: First ever Comet Landing: Live Feed

Post by halfwise on Wed Nov 12, 2014 9:05 pm

Just eyeballing Bungo's video, it's on an elliptical orbit with one end at the earth's orbit, and the other end about twice mars orbit. But the current manuevers are happening about mars orbit. At closest approach mars is about 0.5 AU from earth, or about 4 light minutes. At furthest, it would be 2.5 AU, or 20 minutes. I assume they planned to get things as close as they could, so probably closer to 4 light minutes but not greater than 20.

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Re: First ever Comet Landing: Live Feed

Post by Eldorion on Wed Nov 12, 2014 9:07 pm

Thanks, Halfy.
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Re: First ever Comet Landing: Live Feed

Post by Pettytyrant101 on Wed Nov 12, 2014 9:10 pm

I think I heard them say during the live thing the delay was 25 minutes.

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Re: First ever Comet Landing: Live Feed

Post by halfwise on Wed Nov 12, 2014 9:13 pm

That would be out and back, which I neglected to realize, so between 12 and 13 light minutes away.

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Re: First ever Comet Landing: Live Feed

Post by David H on Wed Nov 12, 2014 9:51 pm

This is cool! Wish I had time to read up on it. I'm thinking they tried to intercept the comet as far away as practical so they can watch it "wake up" as it approaches the sun. The greater the range of temperatures you observe the more I'd think you could tell about its composition. That's just a farmer talkin' tho.....

How big is this comet supposed to be, anyway? It's apparently got significant gravity.

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Re: First ever Comet Landing: Live Feed

Post by halfwise on Wed Nov 12, 2014 10:10 pm

I think this picture puts it in perspective:

https://www.flickr.com/photos/anosmicovni/14677927249

(anyone know how to insert a flickr photo as an image? Just pasting the url doesn't work)

I've been a bit confused about references to 'orbiting' the comet.  I was assuming the 'orbiter' was just in the same solar orbit with the comet, rather than orbiting the comet itself.  May be wrong about that.

Good point about maybe wanting to watch the comet "wake up".

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Re: First ever Comet Landing: Live Feed

Post by David H on Wed Nov 12, 2014 10:17 pm

halfwise wrote:


Shocked

That must have happened while I was busy harvesting.

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Re: First ever Comet Landing: Live Feed

Post by halfwise on Wed Nov 12, 2014 10:22 pm

A rough estimation of the orbital period around this comet would be in the tens of hours.

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Re: First ever Comet Landing: Live Feed

Post by halfwise on Wed Nov 12, 2014 10:25 pm

David H wrote:
halfwise wrote:


Shocked

That must have happened while I was busy harvesting.


I guess bouncing around on a cranberry combine you might not notice the impact from a thousand miles away.


Last edited by halfwise on Wed Nov 12, 2014 10:26 pm; edited 1 time in total

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Re: First ever Comet Landing: Live Feed

Post by Pettytyrant101 on Wed Nov 12, 2014 10:25 pm

Here you go Halfy-


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Re: First ever Comet Landing: Live Feed

Post by Pettytyrant101 on Wed Nov 12, 2014 10:26 pm

Ah see Dave sussed it out anway!

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Re: First ever Comet Landing: Live Feed

Post by Mrs Figg on Wed Nov 12, 2014 10:29 pm

wow thats pretty big Shocked
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Re: First ever Comet Landing: Live Feed

Post by azriel on Wed Nov 12, 2014 10:32 pm

Now if someone says a comet bumped off the Dinosaurs I can say.................ok !
Thats a big chunk flying about. Shocked

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Re: First ever Comet Landing: Live Feed

Post by halfwise on Wed Nov 12, 2014 10:33 pm

For those of us just joining, "comet landing" refers to us landing on the comet, not a comet landing on us.

I like to head off misunderstandings before they occur. Nod

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Re: First ever Comet Landing: Live Feed

Post by azriel on Wed Nov 12, 2014 10:50 pm

Yeah, yeah Smile but it makes you re-think when stories are banded about of Comets crashing to Earth does it not ? Smile

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Re: First ever Comet Landing: Live Feed

Post by Pettytyrant101 on Wed Nov 12, 2014 10:51 pm

Yeah and add in that the bugger is probably moving at ridiculous speeds to affraid

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Re: First ever Comet Landing: Live Feed

Post by azriel on Wed Nov 12, 2014 10:52 pm

Crying or Very sad pale

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Re: First ever Comet Landing: Live Feed

Post by halfwise on Wed Nov 12, 2014 10:58 pm

For me the eye-opener is how solid and rocky it looks. Sure, it may still be all frozen gas/liquid, (maybe it's only enough gas/liquid to hold the rocks together?), but it surely doesn't look like something that will just vaporize as it hits the atmosphere.

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Re: First ever Comet Landing: Live Feed

Post by halfwise on Wed Nov 12, 2014 10:59 pm

BTW, I wonder if it will start a new boot style?

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Re: First ever Comet Landing: Live Feed

Post by Mrs Figg on Wed Nov 12, 2014 11:12 pm

its gonna be weird if they dont find lots of water because thats a pet theory if I am not mistaken. I think they are supposed to be giant seeding blobs, full of life making stuff.
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Re: First ever Comet Landing: Live Feed

Post by halfwise on Wed Nov 12, 2014 11:16 pm

Watch it be full of Vegemite.

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Re: First ever Comet Landing: Live Feed

Post by David H on Wed Nov 12, 2014 11:17 pm

Icy snowballs can still hurt. Just ask the Fjordlandians!

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Re: First ever Comet Landing: Live Feed

Post by David H on Thu Nov 13, 2014 4:32 am

I just looked up comet 67p. It's got a mass of 10^13 kg ( that's 2,000,000,000 African elephants for Amarie ) and an estimated escape velocity of 1 meter per second, or 2 1/4 mph. So it is possible to have the mother ship Rosetta orbiting very low and very slowly. On the other hand traveling at a slow walk would put you into orbit... Shocked

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