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Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts

 
K Hall (OP)

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07/24/2014 04:55 PM

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
4th time the charm

[link to www.youtube.com (secure)]
 Quoting: Anonymous Coward 42637716


You filmed a contrail. Comet 67p is an incredibly dim periodic comet which you need an extremely powerful telescope to see.

 Quoting: Dr. Astro


I thought you might be be going for it with the itelescope.net telescopes, like you did with the asteroid.

[link to blogs.esa.int]

K
 Quoting: K Hall


I know the guy who shot those images in that video. It's something I'd like to do if I had more time available, but finding that asteroid depleted all of my reserves of itelescope time. They're only now starting to replenish, but it was worth it, even if it never got confirmation from other observers.
 Quoting: Dr. Astro


Sorry to hear you are low on telescope time and you didn't get that confirmation. I think I will have to find out about robotic telescopes, 9 out of ten days the weather is just too crap in the UK. I will probably start with the Bradford telescope.

Here, you can find a new asteroid every coffee break

[link to www.asteroidzoo.org]

and yes of course it's cheating ;)

Thread: ** Help save Earth by finding Killer Asteroids ** Mystery minor planet X found ? ** BBC Fail to disclose information ** Zooniverse needs you ! .

K
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
...


You filmed a contrail. Comet 67p is an incredibly dim periodic comet which you need an extremely powerful telescope to see.

 Quoting: Dr. Astro


I thought you might be be going for it with the itelescope.net telescopes, like you did with the asteroid.

[link to blogs.esa.int]

K
 Quoting: K Hall


I know the guy who shot those images in that video. It's something I'd like to do if I had more time available, but finding that asteroid depleted all of my reserves of itelescope time. They're only now starting to replenish, but it was worth it, even if it never got confirmation from other observers.
 Quoting: Dr. Astro


Sorry to hear you are low on telescope time and you didn't get that confirmation. I think I will have to find out about robotic telescopes, 9 out of ten days the weather is just too crap in the UK. I will probably start with the Bradford telescope.

Here, you can find a new asteroid every coffee break

[link to www.asteroidzoo.org]

and yes of course it's cheating ;)

Thread: ** Help save Earth by finding Killer Asteroids ** Mystery minor planet X found ? ** BBC Fail to disclose information ** Zooniverse needs you ! .

K
 Quoting: K Hall


Heh, it's all good, my time reserves are now back up to what they were. I like to have at least a couple hundred dollars of scope time ready to go at a moment's notice just in case I find something. iTelescope is very handy, and very top end. One of the members had his photo prominently published in Sky & Tel last month. Also, because of that whole thing with the asteroid/rosetta, I'm now part of the PACA group for 67P.

Last Edited by Dr. Astro on 07/24/2014 04:59 PM
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K Hall (OP)

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
iTelescope is very handy, and very top end.
 Quoting: Dr. Astro


That's why I think I will start with this one [link to www.telescope.org] while I am learning the basics, it's a submit a job request and wait, try again type of thing.

One of the members had his photo prominently published in Sky & Tel last month. Also, because of that whole thing with the asteroid/rosetta, I'm now part of the PACA group for 67P.
 Quoting: Dr. Astro


I thought you would join that, still I imagine it's a tricky one to image. It only reaches magnitude 12 at best.

In a couple of weeks we are going to get some awesome close up images of 67P.



[link to www.youtube.com]

K
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
K Hall (OP)

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
this must be wormwood aka apophis. they wouldnt try and land on a comet unless it was a threat to earth. THINK ABOUT IT. look at the pics of this thing... funny thing is they keep renaming the same comet/asteroid over and over.............................................
 Quoting: Anonymous Coward 42637716



they wouldnt try and land on a comet unless it was a threat to earth.

One reason they are trying to land on a comet is because it provides a boost for European aerospace and research, another is for prestige. There is even an argument to be made that it is helping us to know how to deal with a future comet threat.

The overriding reason we are trying to land on a comet is because humans have an unquenchable thirst for knowledge. We are going because we can, although this mission is at the very cutting edge of our capabilities.


12 days and 3234 km to rendezvous


K

Last Edited by K Hall on 07/25/2014 07:26 AM
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
K Hall (OP)

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
The comet is "sweating" two glasses of water per second.

[link to www.esa.int]

That dosen't sound like much, but that rate will increase as the comet warms up. Water is pretty much the last volatile material that a comet produces, it has an extraordinarily high boiling point ( yes I know ice sublimates in a vacuum ) for such a light molecule.

Water is one of the strangest substances we know about.



[link to www.youtube.com]


K
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
K Hall (OP)

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
Esa have produced a new CGI animation based on the rather pixelated image from July 14.

[link to www.esa.int]

Here is the article.

[link to www.esa.int]

I have been doing some calculations for all the fans of electric comets but it is too late to post it now, I will do it tomorrow. You may be surprised by what I found.

K
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
K Hall (OP)

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
There are a number of electric comet fans on GLP so I thought I would look at what the potential implications of an electric comet would be on Rosetta.

The Electric ( universe / comet ? ) movement claims that each body in the solar system is at a dramatically different electric potential. They say that the Sun has a high positive potential and everything else is increasingly negatively charged as you move further out. In EU/EC, when bodies come close together there are huge visible electric arcs causing canyons and craters to form on planets.

In the EU/EC video they claim the Deep Impact comet impactor was destroyed by a huge electrical discharge before it reached the comet. This would obviously be a problem for Rosetta.

------

The first problem when considering how Rosetta would be affected is that throughout the solar system there is a quasi neutral, thermally ionized plasma emanating from the Sun called the solar wind. The balance of charges in the solar wind implies that Sun must also have charge neutrality, but we will have to ignore this for now. The second problem is that this plasma is a good conductor so all objects in the solar system, including Rosetta and 67P, would fairly quickly come to the same potential.

We are used to seeing demonstrations of large lightning like electrical discharge, or softly glowing plasmas. There have been lots of lab experiments with Crookes tubes and terrellas demonstrating Birkeland currents as well as investigations into arcing effects on surfaces.

All of these phenomena have something in common, the dielectric breakdown voltage is determined by Paschen's law.

( warning 16 page pdf )
[link to www-eng.lbl.gov]

So I calculated the dielectric breakdown voltage for 67P inner coma based on this report.

( Warning 140 page PDF, really don't download this one unless you want to know everything about 67P )
[link to kups.ub.uni-koeln.de]

The formula goes like this

V= Bpd / ln( Apd / ln( 1/ gamma ))

Where V is the breakdown voltage, A and B are gas constants, p is pressure, d is distance and gamma is a constant related to the work function of the electrode.

I couldn't get any real values to come out for 67P coma so I did a bit of digging and discovered that below a certain pressure, there is no dielectric breakdown due to Paschen's law.

That means in the high vacuum of space and the thin atmospheres of minor planets, comets, asteroids, airless moons and planets there can be: no sudden lightning bolts, no plasmas lighting up, no brilliant arc discharge between the worlds.

That's a bit disappointing for electric enthusiasts so I had to find out if there was any other mechanism. more to come....


10 days and 2609km to rendezvous.


( edit to put electric comet posts together)
So we know there will be no visible lightning bolts, plasma arcs of huge sparks jumping between any body in the solar system because either they are already surrounded in conductive plasma or the gas pressure is too low to allow dielectric breakdown.

There is one further way for dielectric breakdown to occur in a high vacuum, that is through field emission.

( 16 pages )
[link to www.classe.cornell.edu]

Field emission is a mechanism whereby electrons can tunnel out of a material and cross a vacuum, given a high enough voltage. The voltage has a linear relationship to the gap distance and is related to the work function of the material. A typical value for a metal ( like Rosetta ) is 6E+7 V/cm, that is 60 million volts per centimeter. So now we can use this value to calculate the voltage needed to zap Rosetta from 67P, if it was possible for them to be at different potentials.

Today Rosetta is 9 days and 2223km from 67P.

So it would take 1.333E+16 V, that is
13.33 petavolts or
13,330,000,000,000,000 V

K

Last Edited by K Hall on 08/10/2014 05:13 AM
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
K Hall (OP)

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
Once Rosetta has arrived within 100km of 67P then an even more difficult phase of the mission begins as Rosetta starts a series of burns designed to put it into a 25km orbit of the comet.



[link to www.youtube.com]

More images of the comet will be released tomorrow.

K

Last Edited by K Hall on 07/28/2014 11:14 AM
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
Electric comet 67P

So we know there will be no visible lightning bolts, plasma arcs of huge sparks jumping between any body in the solar system because either they are already surrounded in conductive plasma or the gas pressure is too low to allow dielectric breakdown.

There is one further way for dielectric breakdown to occur in a high vacuum, that is through field emission.

( 16 pages )
[link to www.classe.cornell.edu]

Field emission is a mechanism whereby electrons can tunnel out of a material and cross a vacuum, given a high enough voltage. The voltage has a linear relationship to the gap distance and is related to the work function of the material. A typical value for a metal ( like Rosetta ) is 6E+7 V/cm, that is 60 million volts per centimetre. So now we can use this value to calculate the voltage needed to zap Rosetta from 67P, if it was possible for them to be at different potentials.

Today Rosetta is 9 days and 2223km from 67P.

So it would take 1.333E+16 V, that is
13.33 petavolts or
13,330,000,000,000,000 V

K

Last Edited by K Hall on 08/10/2014 05:14 AM
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
K Hall (OP)

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
Here is the latest refined model of 67P. If you still have any red/green 3d glasses, you can view the second animation in 3d.

[link to blogs.esa.int]

There will be some more detailed images released on the 31st form Rosetta's narrow angle camera ( Osiris ).

8 days and 2000km to rendezvous. 12,000 teravolts needed for thunderboltz.

K
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
K Hall (OP)

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
Asteroid 2007 VN84 was set to be one of the closest brushes the Earth had with a NEO. An alert was sent out in Novemeber 2007. The asteroid eventually passed just 5,301 km above the Pacific Ocean, well within the orbit of many satellites. The rogue was even captured in an animation from German astronomers.

[link to www.esa.int]

This would have been an excellent GLP doom scenario except for the minor detail that 2007 VN84 never existed. What the astronomers had actually witnessed was Rosetta making a close pass of the Earth to use the gravitaional slingshot energy to speed it up on its way.

[link to www.universetoday.com]

K
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
K Hall (OP)

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
Here is an animation of Rosetta scanning the surface of 67P. Note how slowly it seems to be orbiting, that is because 67P has only 1/1,000th of the gravity of Earth.



[link to www.youtube.com]

The two instruments being illustrated are likely to be the OSIRIS narrow angle camera and VIRTIS imaging spectrometer ( although other instruments like ALICE will be pointed at the nucleus ) both of these instruments will be used to find a suitable landing site for Philae.

7 days 1788km and 10,730 teravolts to rendezvous


K
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
pray_Italy

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07/31/2014 12:54 PM
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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
Since the "experts" seem to know their stuff in this thread (finally one serious thread without the trolling hf) I would like to ask something that is boggling me.

Considering an electric nature of the universe, could Rosetta sustain critical damages to its equipment when it passes through the coma/comes "too close" and gets within range so as to interact magnetically/electrically with the comet?

Thanks guys
bTx

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
As far as a "direct spark" I doubt it... As far as EMF damage? Id hope the craft has sufficient Electromagnetic shielding....

but im no expert.
wherever you go, the sky is up, the ground is down, and there's f'n people everywhere
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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
bump
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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
Since the "experts" seem to know their stuff in this thread (finally one serious thread without the trolling hf) I would like to ask something that is boggling me.

Considering an electric nature of the universe, could Rosetta sustain critical damages to its equipment when it passes through the coma/comes "too close" and gets within range so as to interact magnetically/electrically with the comet?

Thanks guys
 Quoting: pray_Italy


The first, most important point to make is that there are genuine electrical and magnetic effects associated with comets but these have no relation the "Electric universe" belief system.

If you have read my previous posts, you will hopefully have realised that there is no possibility that the electric universe people's claims are true because the Sun emits a quasi neutral plasma which spreads through the solar system therefore the Sun has no net charge and everything in the solar system will reach the same potential.

There are two sources of net charge difference that we should see in comet 67P. The outer coma will eventually consist of mostly water. High energy UV light from the Sun will cause this water to ionise ( photoionisation ) and gain a net positive charge. We may also see areas on the comet nucleus picking up a ( small ? ) net positive charge through a similar process ( photoelectric effect ).

There will be no effect on Rosetta from the ionised plasma in the outer coma, as Rosetta will be orbiting close to the nucleus in the inner coma.

There may be a chance of small electrical discharge on the Philae lander due to the local net charge imbalance ( high resistance dust/substrate in vacuum with photoelectric charging ) but we have landed probes on Venus, Mars, the Moon and Titan as well as the Asteroid Itokawa and so far nothing has failed through electrical discharge.

K

Last Edited by K Hall on 07/31/2014 09:48 PM
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
K Hall (OP)

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
Thanks for the pin !

hf
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
K Hall (OP)

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
The last NAVCAM picture from Tuesday still looks like Rosetta is heading towards a space duck.

[link to blogs.esa.int]

cool2

K
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
K Hall (OP)

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
Here is today's more detailed picture from the OSIRIS narrow angle camera. It's getting closer now. We may see a smoothed and interpolated version of this picture in the next couple of days.

[link to www.esa.int]

Rosetta is 6 days and 1364km from 67P. You would need 8,184 teravolts to zap Rosetta today.

K

Last Edited by K Hall on 07/31/2014 07:46 PM
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
Well I had a go at tweaking the latest 67P image myself, so until ESA release theirs, here is one I made earlier.

[link to i.imgur.com]

It looks more like a space cat than a space duck now.

Today Rosetta is five days and 1154km from 67P, it would take 6,918 teravolts to zap Rosetta now

K
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
K Hall (OP)

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
One of the first ( ? ) science results from the study of 67P by Rosetta has been published. Two weeks ago VIRTIS, the thermal imaging spectrometer, began to gather average surface temperature readings form 67P. The temperature of -70C ( 203K ) suggests that the surface of comet 67P is NOT predominantly icy.

[link to www.esa.int]

Back in 1950 Fred Whipple proposed a new model for comets that became know as the dirty snowball model. This was interpreted as meaning that comets were mostly icy with some dust included.

Asteroids, on the other hand, were thought to rocky, metal rich and dry. By 1997 the models of asteroids and comets were beginning to change. Iwan Williams used the analogy that we were no longer zoo keepers, keeping these two classes of objects separate but we now had to think of a safari park of asteroid like comets and comet like asteroids.

[link to astrogeo.oxfordjournals.org]

The movement towards this point of view has been accelerating in recent years with the study of a group of asteroids called the centaurs that may have comet like attributes. In fact the correct term is small solar system bodies SSSB, this includes all asteroids and comets together.

K
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
K Hall (OP)

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
In addition to the Centaurs there have been a number of comet like asteroids identified in the the asteroid belt. These are, unsurprisingly, called main belt comets. It is thought that a number of near Earth Objects ( NEOs ) may be comets that have exhausted their ices.

You may remember from last year the SSSB P/2013 P5 that sprouted six comet like tails,

[link to www.sci-news.com]

and the news that the largest object in the asteroid belt, dwarf planet Ceres was jetting water into space.

[link to www.wired.com]

It has been know for some time that cometary nuclei are dark, too dark to be very icy. The speculation has been that comets are covered in a crust of silicate dust and rock, overlying an icier core. This impression was backed up by Rosetta when in 2005 it observed the impact mission on comet Temple 1. Rosetta found that Temple 1 had a much higher proportion of dust and rock than had been expected.

[link to news.nationalgeographic.com]

So was Whipple very wide of the mark. Well I found the abstract to his original paper of 1950 in which he said "Vaporization of the ices leaves an outer matrix of non-volatile insulating meteoric material" In other words the surface of comets are dry and dusty !

[link to adsabs.harvard.edu]

Rosetta is really going to unlock these mysteries, there will be plenty of surprises in store.

Today Rosetta is four days and 768km from comet 67P. 4,416 teravolts to go.

K
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
Today Rosetta is four days and 768km from comet 67P. 4,416 teravolts to go.

K
 Quoting: K Hall

And still no sparks hitting Rosetta - the EU tards will be very disappointed.

.
If the Moon is off, if Earth wobbles or if there is a pole shift
how can things like this, predicted decades ago, happen?

aseindia
Annular Solar Eclipse - January 15, 2010 - Rameshwaram, India
K Hall (OP)

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
Today Rosetta is four days and 768km from comet 67P. 4,416 teravolts to go.

K
 Quoting: K Hall

And still no sparks hitting Rosetta - the EU tards will be very disappointed.

.
 Quoting: Hydra


Yes, in four days it will be within 100km of the comet. Then it will begin to establish an orbit that will bring it to within 25km of the surface. By November it will have prepared a delivery orbit that brings Rosetta down to 1km from the surface to eject the Philae lander for it's journey to the surface. If there is a big potential difference then at some point Rosetta and/or Philae will be destroyed by a huge electrical discharge.

I hope the electric fans come along and have a free guess at the voltage or distance this will happen at.

K
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
K Hall (OP)

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
Here is the latest picture from NAVCAM, the navigation camera used for maneuvering Rosetta.

[link to blogs.esa.int]

A close up.

[link to blogs.esa.int]

There is a new OSIRIS picture coming soon, I just have to make a tidied up version.

K
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
K Hall (OP)

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
Here is the latest narrow angle OSIRIS picture of comet 67P from 1000km away.

[link to blogs.esa.int]

This is my slightly tweaked version.

[link to i.imgur.com (secure)]

I wonder if those lighter patches on the surface, especially near the neck could be ices?

K
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
K Hall (OP)

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
This morning Rosetta completed the CATP burn. This has the catchy name of close approach trajectory pre-insertion burn. I think they just like cats. This burn lasted 13 minutes and aimed to get Rosetta to within 70km of 67P at a closing velocity of 1 m/s, that is a gentle strolling pace.

Here is a little animation of sunrise on 67P.



[link to www.youtube.com]

Rosetta is 3 days 534km and 3,204 teravolts away from 67P.

K
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
K Hall (OP)

User ID: 22522273
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08/03/2014 07:30 PM

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
Planetary mission specialist Detlef Koschny had a problem visualising the actions of different probes, so he turned to LEGO to help him.



[link to www.youtube.com]

Why stop there when you can build a LEGO comet.



[link to www.youtube.com]

Detlef in his own words.

[link to www.esa.int]


Today Rosetta is two days 314km and 1,814 teravolts from 67P


K
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble
Lime Flavoured Redux

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08/03/2014 07:55 PM
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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
This mission is pretty cool, and I wish that NASA and the ESA (or JAXA, or anyone) would send more probes like this to a variety of comets and asteroids (I'm especially interested in 90 Antiope because of it's binary nature).

Last Edited by Lime Flavoured Redux on 08/03/2014 07:55 PM
K Hall (OP)

User ID: 22522273
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08/03/2014 08:16 PM

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Re: Rosetta Comet Orbiter ** Last Chance BIG PRIZE ** Three days to live ** Landing site J 10km orbit ** 67P selfie ** GLP pics ** 46,000 Gvolts
This mission is pretty cool, and I wish that NASA and the ESA (or JAXA, or anyone) would send more probes like this to a variety of comets and asteroids (I'm especially interested in 90 Antiope because of it's binary nature).
 Quoting: Lime Flavoured Redux


Yes 90 Antiope is an interesting one, they seem to be orbiting so closely.

I loved the discovery of the tiny moon Dactyl orbiting around 243 Ida by the Galileo probe, asteroid moons may turn out to be quite common.

[link to en.wikipedia.org]

Comet 67P looks pretty odd too, like two comets have stuck together. Here is the latest image.

[link to imgur.com (secure)]

and an older animation.

[link to www.esa.int]

Look out for more detailed images in the next few days.

K
"Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.” Edwin Hubble

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