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How Big is Rosetta’s Comet?
Universe Today via Phys.org ^ | Thursday, July 03, 2014 | Jason Major

Posted on 07/04/2014 4:47:19 PM PDT by SunkenCiv

...while it's one thing to say that the nucleus of Comet 67P/Churyumov-Gerasimenko is about three by five kilometers in diameter, it's quite another to see it in context with more familiar objects. Think about it—a comet as tall as Mt Fuji!

At the time of this writing Rosetta is 35 days out on approach to Comet 67P/C-G, at a distance of about 51,000 km (31,700 miles) and closing. Three "big burn" maneuvers have already been performed between May 7 and June 4 to adjust the spacecraft's course toward the incoming comet, and after smaller ones on June 18 and July 2 there are a total of five more to go. See details of Rosetta's burn maneuvers here.

As incredibly sensitive as they are, Rosetta's instruments—which were able to detect the water vapor coming from Comet 67P/C-G from a distance of over 360,000 km—have even sniffed the hydrazine exhaust from its own thruster burns.

Luckily the remaining burns are relatively small compared to the first three, with the final being very brief, so any data contamination by Rosetta's own exhaust shouldn't become an issue once the spacecraft has established orbit in August.

Launched in March 2004, ESA's Rosetta mission will be the first to orbit and land a probe on a comet, observing its composition and behavior as it makes its close approach to the Sun in 2015. Click here to see where Rosetta is right now.

Note: While 3-5 km seems pretty big (especially when stood on end) comet nuclei can be much larger, 10 to 20 km in diameter up to the enormous 40+ km size of Hale-Bopp. As comets go, 67P/C-G is fairly average. (Except that, come August, it will be the only comet with an Earthly spacecraft in tow!)

(Excerpt) Read more at phys.org ...


TOPICS: Astronomy; Science
KEYWORDS: catastrophism; churyumovgerasimenko; comet67p
Diagram of Comet 67P/C-G compared to terrestrial landmarks. Credit: ESA

Diagram of Comet 67P/C-G compared to terrestrial landmarks. Credit: ESA

1 posted on 07/04/2014 4:47:19 PM PDT by SunkenCiv
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To: Las Vegas Dave; brytlea; cripplecreek; decimon; bigheadfred; KoRn; Grammy; steelyourfaith; ...

Thanks Las Vegas Dave, and an extra to APoD. See the keywords for a number of topics in the FRchives.


2 posted on 07/04/2014 4:48:52 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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To: SunkenCiv

I must have just awoken from a coma...yesterday it was a stone, today it is a comet. Does anyone else still think that inflation is run amok on planet earth?


3 posted on 07/04/2014 4:49:30 PM PDT by Delta Dawn (Fluent in two languages: English and cursive.)
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To: SunkenCiv

Hoping for some good pics.


4 posted on 07/04/2014 4:49:32 PM PDT by cripplecreek (Remember the River Raisin.)
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To: 75thOVI; agrace; aimhigh; Alice in Wonderland; AndrewC; aragorn; aristotleman; Avoiding_Sulla; ...
Thanks Las Vegas Dave.

5 posted on 07/04/2014 4:50:02 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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To: SunkenCiv

Thank God they decided to call it “Rosetta’s comet instead of its real name. (Comet 67P/Churyumov-Gerasimenko)


6 posted on 07/04/2014 4:55:36 PM PDT by cripplecreek (Remember the River Raisin.)
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To: SunkenCiv

Quick, somebody tell bpearthwatch that the tiny spacecraft is going to redirect the comet.
I’d love to see that idiot drone through an explanation of how it will do that.


7 posted on 07/04/2014 5:00:56 PM PDT by Darksheare (Try my coffee, first one's free..... Even robots will kill for it!)
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To: cripplecreek

It will always be 67P/Churyumov-Gerasimenko to me...

Just curious, won’t the outgassing as they approach
the sun dislodge the lander?


8 posted on 07/04/2014 5:04:41 PM PDT by tet68 ( " We would not die in that man's company, that fears his fellowship to die with us...." Henry V.)
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To: Jack Hydrazine

It knows you...


9 posted on 07/04/2014 5:26:43 PM PDT by null and void (If Bill Clinton was the first black president, why isn't Barack Obama the first woman president?)
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To: null and void

LOL! Yes it does!


10 posted on 07/04/2014 5:30:10 PM PDT by Jack Hydrazine (Pubbies = national collectivists; Dems = international collectivists; We need a second party!)
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To: tet68
Just curious, won’t the outgassing as they approach the sun dislodge the lander?

You would think so. Maybe it should be named "The Dingelberry Lander".
11 posted on 07/04/2014 5:33:11 PM PDT by cripplecreek (Remember the River Raisin.)
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To: Jack Hydrazine; null and void
from a distance of over 360,000 km—have even sniffed the hydrazine exhaust

Would you kindly ram an air filter up your bung?? Do the world a favor...

12 posted on 07/04/2014 5:34:51 PM PDT by ErnBatavia (It ain't a "hashtag"....it's a damn pound sign. ###)
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To: ErnBatavia

Hydrazines don’t have bungs!


13 posted on 07/04/2014 5:35:45 PM PDT by Jack Hydrazine (Pubbies = national collectivists; Dems = international collectivists; We need a second party!)
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To: SunkenCiv
Comets are so overblown. Ever since I was a kid, everybody was always hyping up one comet or another. But none of them ever panned out. Even Halley's Comet in 1984 was a dud.

The only comet that ever amounted to anything.

14 posted on 07/04/2014 6:15:45 PM PDT by SamAdams76
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To: Darksheare; SunkenCiv
I’d love to see that idiot drone through an explanation of how...

Never fear... If he can conceive it, he will publish it...

15 posted on 07/04/2014 6:17:57 PM PDT by NoCmpromiz (John 14:6 is a non-pluralistic comment.)
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To: NoCmpromiz; SunkenCiv

Old addled BP might need a spot of help on this one.
Lol.


16 posted on 07/04/2014 6:21:19 PM PDT by Darksheare (Try my coffee, first one's free..... Even robots will kill for it!)
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To: SamAdams76

;’)

http://www.youtube.com/watch?v=jOrhjgt-_Qc


17 posted on 07/04/2014 6:21:40 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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To: Darksheare

Hey, I wait for all those nutbars on YT to “discover” the “NASA cover-up” for themselves. ;’)


18 posted on 07/04/2014 6:23:28 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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To: SamAdams76

There have been a couple of big-assed naked-eye comets in my lifetime, but it’s been around 20 years since the last one.

http://www.youtube.com/watch?v=vNstzM7hcyQ


19 posted on 07/04/2014 6:26:41 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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To: SunkenCiv; NoCmpromiz

I kinda enjoy poking the nutrigrains on YT.
I guess it’s that kid fascination with poking stuff with a stick.
Or making bugs in a jar fight.


20 posted on 07/04/2014 6:30:45 PM PDT by Darksheare (Try my coffee, first one's free..... Even robots will kill for it!)
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To: NoCmpromiz; Darksheare

:’)


21 posted on 07/04/2014 6:32:41 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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To: cripplecreek
Only if it was landing on -

wait for it -

Uranus.

22 posted on 07/04/2014 6:36:15 PM PDT by kitchen (Even the walls have ears.)
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To: SunkenCiv; Darksheare; Jack Hydrazine; null and void
might need a spot of help on this one.

I'll help him write it.

You see, it will happen this way. The perturbations induced in Comet 67P/Churyumov-Gerasimenko's orbital path from the orbiting Rosetta craft will be amplified by the force of the lander impacting on the surface of the comet. This will cause the nucleus of the comet to grow from 5 km to huge size. The altered orbital trajectory will now cause the comet to collide with the Isonids and in turn careen the huge clouds of Isonids that miraculously did not end life on Earth as we know it their first time around into an intersecting path with Earth for another cataclysmic event.

Comet 67P/Churyumov-Gerasimenko now with a majorly modified orbit will slingshot around the sun and be massively influenced by the gravitational well of the impressive planet Mercury. This will cause the nucleus with it's NASA spacecraft on board to make a bee-line for Earth while at the same time causing Herculobus to materialize on a collision course with Niburu. NASA cameras will develop a series of 18 minute gaps in their data as Lois Learner's hard drive vainly attempts to spin away, er, up to compensate for the cover up by producing video of Michael Moore eating Venus.

The cloud of hydrazine vapors following the orbiter and lander will clone themselves and replace the atmosphere of Earth with a toxic substitute closely akin to Hillary's breath after a party. Or all the time. But I repeat myself.

And we're all gonna die.

As 'ol BP Earfbotch sez, 'Be safe out there..."

© 2014 by NoCmpromiz. Use Permission with attribution granted to BPEarthwatch only.

23 posted on 07/04/2014 8:01:24 PM PDT by NoCmpromiz (John 14:6 is a non-pluralistic comment.)
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To: NoCmpromiz; SunkenCiv; Jack Hydrazine; null and void

You forgot to add BP’s reptoid brothers in there, but otherwise spot on with the stuff that dude puts out.


24 posted on 07/04/2014 8:04:56 PM PDT by Darksheare (Try my coffee, first one's free..... Even robots will kill for it!)
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To: Darksheare; NoCmpromiz

:’D


25 posted on 07/04/2014 8:28:01 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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To: Darksheare
orgot to add BP’s reptoid brothers

Yep, closest I got to reptoids was Michael Moore...

(Hillary doesn't count, she's a chancre..)

26 posted on 07/04/2014 8:38:50 PM PDT by NoCmpromiz (John 14:6 is a non-pluralistic comment.)
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To: NoCmpromiz

bump

lol


27 posted on 07/04/2014 8:41:02 PM PDT by GeronL (Vote for Conservatives not for Republicans)
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To: SunkenCiv

];-)


28 posted on 07/04/2014 8:42:02 PM PDT by Darksheare (Try my coffee, first one's free..... Even robots will kill for it!)
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