APOD: Rosetta's Rendezvous (2014 Aug 07)

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Expand view Topic review: APOD: Rosetta's Rendezvous (2014 Aug 07)

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by ta152h0 » Sun Sep 28, 2014 12:35 am

another dwarf planet names Pluto

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by Wanatoctouillou » Sat Sep 27, 2014 11:57 pm

Robert L.Grisham wrote:The Rosetta Comet we observed on Aug 7,2014 . Was in great detail and my brother Jerry Grisham noticed a Face on the
back of the Comet , in very good detail, with a fore head ,and eyes sockets, prominent Nose, and mouth and chin.
See if you can point this out.
May be this kind of face ?
Image :ssmile:

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by Robert L.Grisham » Mon Aug 11, 2014 9:56 pm

The Rosetta Comet we observed on Aug 7,2014 . Was in great detail and my brother Jerry Grisham noticed a Face on the
back of the Comet , in very good detail, with a fore head ,and eyes sockets, prominent Nose, and mouth and chin.
See if you can point this out.

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by DavidLeodis » Fri Aug 08, 2014 1:21 pm

The stereo effect (using appropriate glasses) seen in the red/blue anaglyph that is brought up through the "revealed in amazing detail" link is absolutely superb. :)

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by Boomer12k » Fri Aug 08, 2014 1:14 am

Awesome detail...

:---[===] *

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by geckzilla » Thu Aug 07, 2014 11:17 pm

Fraglerock wrote:[ https://fbcdn-sphotos-e-a.akamaihd.net/ ... ddf471173a ] Venus and Mercury photographed by me last night 06/08/2014 at Oulton Broad Lowestoft Suffolk UK, me being an amateur photographer ( self taught ) and I was taking photo's of the sunset over Oulton Broad. :)
So you mentioned already. And also you very likely did not photograph Venus or Mercury.

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by Fraglerock » Thu Aug 07, 2014 11:09 pm

[ https://fbcdn-sphotos-e-a.akamaihd.net/ ... ddf471173a ] Venus and Mercury photographed by me last night 06/08/2014 at Oulton Broad Lowestoft Suffolk UK, me being an amateur photographer ( self taught ) and I was taking photo's of the sunset over Oulton Broad. :)

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by neufer » Thu Aug 07, 2014 9:57 pm

ta152h0 wrote:
I agree , congratulations to the ROSETTA team. New Horizons was mentioned on the thread. I hope the spacecraft crashes into Pluto with the cameras rolling like the Rangers did on the moon. It would be fitting if Mr Tombaugh's ashes are on board.
  • Don't expect any "postcards" from New Horizons then:
http://en.wikipedia.org/wiki/New_Horizons wrote:
<<New Horizons should perform a flyby of the Pluto system on 14 July 2015. Initial, highly-compressed images will be transmitted within days. Uncompressed images will take about nine months to transmit, depending on Deep Space Network traffic. It may turn out, however, that fewer months will be needed. The spacecraft link is proving stronger than expected, and it is possible that both downlink channels may be ganged together to nearly double the data rate.>>

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by ta152h0 » Thu Aug 07, 2014 9:46 pm

I agree , congratulations to the ROSETTA team. New Horizons was mentioned on the thread. I hope the spacecraft crashes into Pluto with the cameras rolling like the Rangers did on the moon. It would be fitting if Mr Tombaugh's ashes are on board.

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by julianm3 » Thu Aug 07, 2014 3:41 pm

Congratulations Rosetta team, great work! Hoping we'll get a movie of the rotation up close.

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by Psnarf » Thu Aug 07, 2014 2:56 pm

What happened to my rubber duckie? Waah. This is the testbed for changing the orbit of a doomsday comet/asteroid. Acquisition: check. Orbit, determine best landing, land: WIP. The doomsday mover would have a lander that could push the object out of its collision window. Now we know we can do this early enough to work.
Once the sun starts boiling stuff off of the surface, I imagine the carrier rocket will be destroyed. The lander better have deep pointy feet so it can grab onto something that won't eject.
http://nssdc.gsfc.nasa.gov/nmc/spacecra ... ?id=PHILAE
Ahh, Philae has a harpoon to prevent it from bouncing off in the light gravity.

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by Chris Peterson » Thu Aug 07, 2014 2:03 pm

neufer wrote:After looking at Comet Hartley 2 it seemed to me that outgassing of carbon dioxide & water vapor mostly occurred at the spinning ends of this dipole comet (where the escape velocity is minimal).

What material doesn't escape falls/condenses mostly around the central neck (where the escape velocity is maximal).
The outgassing and particle ejection models we use to describe comets put material ejection velocities several orders of magnitude above the comet escape velocity. It's unlikely that significant material settles back down due to gravity, or that gravity impacts where material is ejected from on an irregular nucleus.
Electostatics may play a big role here.
I think that's more likely to play a role in surface dust and ice than gravity.

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by MargaritaMc » Thu Aug 07, 2014 1:17 pm

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by Byork » Thu Aug 07, 2014 1:05 pm

I have an alternative mission for Rosetta. Forget the rendezvous with comet 67P Churyimenko. Rosetta can shoot back to Mars and land on the larger moon Phobos for a front seat view of the Martian atmosphere. The Rosetta deployment on Phobos will help to determine the rate of meteoritic impact with the Martian surface.

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by neufer » Thu Aug 07, 2014 12:54 pm

Click to play embedded YouTube video.
Steve Dutch wrote:
In fifty years of space exploration, this is the very first object that has the weird spiky appearance so beloved of special effects artists!
I hope ESA knows what it's doing :!:

π in the sky?

by neufer » Thu Aug 07, 2014 12:46 pm

Joules wrote:
BDanielMayfield wrote:
I wonder what the mass of this thing is. Have new mass estimates been released yet?
No. Last I saw was in the 0.1 to 0.4 g per cubic cm range. Too insubstantial for even CO2 or nitrogen ice. Yet the thing is obviously rigid. Now that Rosetta's in orbit, it shouldn't be too long before a proper gravity map and mass value come out.
http://blogs.esa.int/rosetta/2014/07/23/last-of-the-fatties/ wrote:
Last of the FATties

<<With about 4500 km separating Rosetta from comet 67P/C-G, the spacecraft will conduct the last of four FAT – ‘Far Approach Trajectory’ – orbit correction manoeuvres later today. Mass is possibly the most uncertain of all the cometary parameters (because the density is extremely uncertain) yet is the single most important parameter to be estimated from the standpoint of early navigation activities at the comet. The latest science data – including recent images indicating the comet is a complex 'contact binary' – is enabling the mission team to refine models of the comet. Based on the best estimates of the comet size & shape available before the recent images, the mass is estimated at 3.14x1012 kg [; i.e., π billion tonnes corresponding to a mean density of 102±9 kg/m³]. This will surely change as we learn more about this enigmatic object.>>

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by BDanielMayfield » Thu Aug 07, 2014 12:43 pm

Joules wrote:
BDanielMayfield wrote:I wonder what the mass of this thing is. Have new mass estimates been released yet?
No. last I saw was in the 0.1 to 0.4 g per cubic cm range. Too insubstantial for even CO2 or nitrogen ice. Yet the thing is obviously rigid. Now that Rosetta's in orbit, it shouldn't be too long before a proper gravity map, and mass value come out.
Thanks Joules. Yes, the most accurate way to "weigh" an astronomical body would be to see how long a known mass at a known distance takes to orbit it.
neufer wrote:Electostatics may play a big role here :!:
Like dust bunnies? :lol2:

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by Steve Dutch » Thu Aug 07, 2014 12:41 pm

In fifty years of space exploration, this is the very first object that has the weird spiky appearance so beloved of special effects artists!

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by MadMan » Thu Aug 07, 2014 12:40 pm

Amazing! The surface reminds me of what I remember from the movie "Deep Impact". Looks like the high spots on the top half have been sanded down, maybe by the dust coming from the leading edge?

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by Joules » Thu Aug 07, 2014 12:22 pm

BDanielMayfield wrote:I wonder what the mass of this thing is. Have new mass estimates been released yet?
No. Last I saw was in the 0.1 to 0.4 g per cubic cm range. Too insubstantial for even CO2 or nitrogen ice. Yet the thing is obviously rigid. Now that Rosetta's in orbit, it shouldn't be too long before a proper gravity map and mass value come out.

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by Tszabeau » Thu Aug 07, 2014 12:01 pm

I hope someone remembered to bring the salt shaker.

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by BDanielMayfield » Thu Aug 07, 2014 11:34 am

I wonder what the mass of this thing is. Have new mass estimates been released yet?

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by distefanom » Thu Aug 07, 2014 11:09 am

After looking at Comet Hartley 2 it seemed to me that outgassing of carbon dioxide & water vapor mostly occurred at the spinning ends of this dipole comet (where the escape velocity is minimal).

What material doesn't escape falls/condenses mostly around the central neck (where the escape velocity is maximal).
It seems that this comet behaves differently than Comet Hartley 2.
Here is an image of this comet, last 2 of august :
http://www.esa.int/spaceinimages/Images ... ugust_2014

here outgassing appears to flow out from the "neck" :roll:

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by neufer » Thu Aug 07, 2014 10:01 am

Ann wrote:
I think it looks as if the comet is covered in snow. Maybe it is, too. Surely it has had at least one outburst recently? Couldn't it have covered itself in its own snow?
:arrow: After looking at Comet Hartley 2 it seemed to me that outgassing of carbon dioxide & water vapor mostly occurred at the spinning ends of this dipole comet (where the escape velocity is minimal).

What material doesn't escape falls/condenses mostly around the central neck (where the escape velocity is maximal).

Electostatics may play a big role here :!:

Re: APOD: Rosetta's Rendezvous (2014 Aug 07)

by distefanom » Thu Aug 07, 2014 8:30 am

Simply fantastic and breathtaking image!
Whoa! mother nature is surprising, even on a "rubble pile of stones" like this one!
I never seen a surface like that one, even if I already seen surfaces of other asteroids.
What is astonishing, is the appearance, the so many steeples, and the
Incredibly smooth surfaces, between boulders and craters and impossible steep slopes here and there...
in the right lobe, right on the top, there is a wide depression where I can imagine the outgassing came out once.
Even thou, in the so-white rosetta image of August, 2 it appears that the main jet comes out from the "neck" of the comet...
At first impression I get, is the DOUGH you get when you knead the flour and it is still wet and not well worked...
It's incredible that only 4 days ago some jets where coming out violently from this thing, I really hope ESA could be smart enough together with some luck, not to be "aimed" by these jets, in a way that could damage the spacecraft....
Go on, ROSETTA ! ! !

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