Dawn @ Ceres
Space probe approaching dwarf planet
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Re: Dawn @ Ceres
#41 
by CdesignProponentsist » Mar 01, 2015 7:12 pm
It's definitely an enigma.
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Re: Dawn @ Ceres
#42 by newolder » Mar 01, 2015 9:07 pm
Abstract
We identified spectral parameters based on 118 laboratory spectra to distinguish carbonaceous chondrite (CC) groups by using seven color filters of the Dawn Framing Camera (FC), which we intend to apply on Ceres data after Dawn’s arrival in 2015.
source
I’m only guessing that this bit of kit should be able to help with bright spot identification soon enough.
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Re: Dawn @ Ceres
#43 by lpetrich » Mar 06, 2015 2:55 pm
NASA Spacecraft Becomes First to Orbit a Dwarf Planet | NASA
Dawn is now moving away from Ceres, but over the rest of this month, it will slow down and then fall toward the asteroid, and by early next month, it should be in a closer and nearly-circular orbit around the asteroid. Dawn will not be returning many pictures until then, since it will be on Ceres's night side.
Dawn Blog » Dawn Journal | November 28 has more on its odd trajectory for this month.
I got the news from NASA's Dawn Mission (@NASA_Dawn) | Twitter
NASA's Dawn spacecraft has become the first mission to achieve orbit around a dwarf planet. The spacecraft was approximately 38,000 miles (61,000) kilometers from Ceres when it was captured by the dwarf planet’s gravity at about 4:39 a.m. PST (7:39 a.m. EST) Friday.
Mission controllers at NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, California received a signal from the spacecraft at 5:36 a.m. PST (8:36 a.m. EST) that Dawn was healthy and thrusting with its ion engine, the indicator Dawn had entered orbit as planned.
"Since its discovery in 1801, Ceres was known as a planet, then an asteroid and later a dwarf planet," said Marc Rayman, Dawn chief engineer and mission director at JPL. "Now, after a journey of 3.1 billion miles (4.9 billion kilometers) and 7.5 years, Dawn calls Ceres, home."
Dawn is now moving away from Ceres, but over the rest of this month, it will slow down and then fall toward the asteroid, and by early next month, it should be in a closer and nearly-circular orbit around the asteroid. Dawn will not be returning many pictures until then, since it will be on Ceres's night side.
Dawn Blog » Dawn Journal | November 28 has more on its odd trajectory for this month.
I got the news from NASA's Dawn Mission (@NASA_Dawn) | Twitter
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Re: Dawn @ Ceres
#44 by Made of Stars » Mar 07, 2015 9:23 pm
Made of Stars, by Neil deGrasse Tyson and zenpencils
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Re: Dawn @ Ceres
#45 by laklak » Mar 07, 2015 9:31 pm
This is just unutterably cool.
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Re: Dawn @ Ceres
#46 by felltoearth » Mar 07, 2015 11:04 pm
lpetrich wrote:For Ceres, the surface-satellite orbital velocity and orbital period: 360 m/s and 2.3 hours. That'll give an idea of how much delta-V Dawn will have to expend to get into a low Ceres orbit
Sorry....
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Re: Dawn @ Ceres
#47 by lpetrich » Mar 16, 2015 6:36 am
Dawn is getting as slow as it will ever get relative to Ceres without crashing onto the asteroid. The spacecraft is also getting to its maximum overshoot distance.
Distance: 77.34 k km, 48.06 k mi
Speed: 10 m/s, 71 km/h, 44 mph
Distance: 77.34 k km, 48.06 k mi
Speed: 10 m/s, 71 km/h, 44 mph
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Re: Dawn @ Ceres
#49 by CdesignProponentsist » Mar 16, 2015 7:09 pm
lpetrich wrote:Oops, that's 20 m/s.
Dawn just crashed into Ceres due to your 'little' mistake. I hope you're happy now.
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Re: Dawn @ Ceres
#50 by DougC » Apr 13, 2015 5:56 pm
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Re: Dawn @ Ceres
#51 by DougC » Apr 21, 2015 4:48 pm
To do, is to be (Socrate)
To be, is to do (Sartre)
Do be do be do (Sinatra)
SUBWAY(1985)
To be, is to do (Sartre)
Do be do be do (Sinatra)
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Re: Dawn @ Ceres
#52 by Steve » Apr 25, 2015 2:45 am
NASA is holding a vote on what the bright spot might be: What's the spot on World Ceres? The choices are volcano, geyser, rock, ice, salt deposit or other...
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Re: Dawn @ Ceres
#53 by lpetrich » Apr 25, 2015 4:12 am
Here's something curious about Ceres, at least so far. Aside from those mysterious bright spots, its surface is all impact craters. No lava plains or other such features that would suggest internal geological activity. Not even the sort of grooves that Vesta has. Because of its size, one might expect some features that suggest internal activity, but none are evident other than those bright spots.
Interestingly, Vesta is at least partially composed of igneous rocks, rocks that had melted and solidified. When Dawn visited there, it collected lots of spectra of its surface, and that strengthened the identification of that asteroid as the source of the HED meteorites (Dawn; the Vesta–HED connection; and the geologic context for eucrites, diogenites, and howardites - McSween - 2013 - Meteoritics & Planetary Science - Wiley Online Library). But Vesta was likely melted only very early in its history, and it does not have any lava plains with a low crater density, as the Moon and Mercury do.
Interestingly, Vesta is at least partially composed of igneous rocks, rocks that had melted and solidified. When Dawn visited there, it collected lots of spectra of its surface, and that strengthened the identification of that asteroid as the source of the HED meteorites (Dawn; the Vesta–HED connection; and the geologic context for eucrites, diogenites, and howardites - McSween - 2013 - Meteoritics & Planetary Science - Wiley Online Library). But Vesta was likely melted only very early in its history, and it does not have any lava plains with a low crater density, as the Moon and Mercury do.
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Re: Dawn @ Ceres
#54 by newolder » May 09, 2015 7:19 pm
General interest cast: Small Worlds 101 – All About Asteroids, Comets and Dwarf Planets
12:30-1:30 pm PDT
http://dawn.jpl.nasa.gov/news/i_c_ceres ... d=14103570
(that could be 15 or 75 minutes from now...)
"Live broadcast will begin shortly." (20:29 BST)
12:30-1:30 pm PDT
http://dawn.jpl.nasa.gov/news/i_c_ceres ... d=14103570
(that could be 15 or 75 minutes from now...)
"Live broadcast will begin shortly." (20:29 BST)
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Re: Dawn @ Ceres
#55 by tuco » May 09, 2015 7:53 pm
They have 11 year old there, just about right for me :)
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Re: Dawn @ Ceres
#56 by newolder » May 09, 2015 7:58 pm
Cucumber test fail... Nerf-ball much better.
Don't drop the Scorpion - especially in the dark!1
Good talk so far...
Don't drop the Scorpion - especially in the dark!1
Good talk so far...
I am, somehow, less interested in the weight and convolutions of Einstein’s brain than in the near certainty that people of equal talent have lived and died in cotton fields and sweatshops. - Stephen J. Gould
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Re: Dawn @ Ceres
#57 by tuco » May 10, 2015 7:54 am
I missed the next part because there was some break then some people in strange clothes and hats walking around .. thanks for the tip. There is nothing like being able to touch stuff and demonstrate.
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Re: Dawn @ Ceres
#58 by DougC » May 12, 2015 12:17 am
http://www.bbc.co.uk/news/science-environment-32696746
B.B.C. Article
Best view yet of Ceres' spots
The fascinating bright spots on the surface of the dwarf planet Ceres have come into sharper view.
What were initially thought to be just a couple of brilliant, closely spaced features at one location now turn out to be a clutch of many smaller dots.
The latest pictures were acquired by the US space agency's Dawn spacecraft on its first full science orbit since arriving at Ceres on 6 March.
The spots were seen from a distance of 13,600km.
(Continues)
To do, is to be (Socrate)
To be, is to do (Sartre)
Do be do be do (Sinatra)
SUBWAY(1985)
To be, is to do (Sartre)
Do be do be do (Sinatra)
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Re: Dawn @ Ceres
#59 by CdesignProponentsist » May 12, 2015 1:39 am
The plot thickens. 
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Re: Dawn @ Ceres
#60 by DougC » May 12, 2015 2:30 am
To the left the hab dome, with a large hanger to the right with some other smaller buildings. 
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To be, is to do (Sartre)
Do be do be do (Sinatra)
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