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Y Bar Ranch
Posted on: Jan 9 2019, 02:22 PM


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Too bad there's no sort of "flash" mechanism going off in the outer hinterlands of the solar system that could momentarily illuminate KBO objects.
  Forum: New Horizons · Post Preview: #243325 · Replies: 573 · Views: 684651

Y Bar Ranch
Posted on: Jan 2 2019, 01:34 PM


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QUOTE (climber @ Jan 2 2019, 03:00 AM) *
A tweet from James Tuttle Keane: Finishing a long night of analyzing new images of #UltimaThule. I can’t wait for you all to see. For now, here’s a teaser...
[attachment=43964:BB001751...FB08BFDA.jpeg]

A pile of pencil shavings?

I now have this mental image of a brave little group of icy bits huddled up in a little gravity well for comfort against the cold, dark void.

I guess I can anthropomorphize anything... rolleyes.gif
  Forum: New Horizons · Post Preview: #242964 · Replies: 294 · Views: 478045

Y Bar Ranch
Posted on: Dec 4 2018, 02:33 AM


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The animation makes it look like boulders should be flying off of it left and right. wink.gif

It'd be interesting to run a "Project Crowbar" to lever off one of the bigger boulders and drag/toss it into orbit for a full grapple and analysis.
  Forum: OSIRIS-REx · Post Preview: #242350 · Replies: 213 · Views: 179006

Y Bar Ranch
Posted on: Jan 1 2018, 10:44 PM


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QUOTE (vjkane @ Jan 1 2018, 10:30 AM) *
That is specifically mentioned in the paper Ralph gave the link to a few posts up.

Ahhh, missed it on the first read.
  Forum: Saturn · Post Preview: #238177 · Replies: 202 · Views: 226660

Y Bar Ranch
Posted on: Jan 1 2018, 04:39 AM


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Wonder what kinds of information can be gathered by just going into a low hover or running the rotors on the ground to generate some airflow. Properties of surface particles? Etc?
  Forum: Saturn · Post Preview: #238171 · Replies: 202 · Views: 226660

Y Bar Ranch
Posted on: Dec 29 2017, 10:45 PM


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I use Titan as a case study for an aero class I teach, and am super-psyched at the idea of such a probe. Low gravity and high density are a rotorcraft's best friends.

Already drooling over the detailed 3D photogrammetry extracted from aerial images.
  Forum: Saturn · Post Preview: #238148 · Replies: 202 · Views: 226660

Y Bar Ranch
Posted on: Aug 9 2016, 06:18 PM


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Sorry to intrude, but is there a map showing future route plans, near term and far? I've looked here and on the obvious sites and couldn't find one. Probably lying in plain sight somewhere, I know...
  Forum: MSL · Post Preview: #232044 · Replies: 2115 · Views: 1955953

Y Bar Ranch
Posted on: Sep 8 2015, 01:37 PM


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QUOTE (vjkane @ Sep 5 2015, 06:59 PM) *
For example, the solar panels on the Juno model are too thin as are the edges of Cassini's high gain antenna, its booms, and the shields around its thrusters among other parts.

For higher end printers (e.g., Fortus 400) there is a work file that gets produced from the STL that is digested by the machine to do the printing. In creating that file, you use software with various settings to manipulate what comes out of the machine, to include accounting for disparities between part geometry and printer resolution. For example, when the solar panel is thinner than the minimum print width, you can change a software setting to print it anyway at the greater width.

So in short, a higher end printing house with a Fortus or similar should be able to play with settings and get something out of the machine that looks like a Juno or Cassini.
  Forum: Chit Chat · Post Preview: #225993 · Replies: 11 · Views: 8683

Y Bar Ranch
Posted on: Sep 8 2015, 01:29 PM


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QUOTE (alk3997 @ Sep 6 2015, 08:45 AM) *
Funding is one of those consumables that has to be conserved, just like propellant.

A perspective I won't forget, thanks!
  Forum: New Horizons · Post Preview: #225992 · Replies: 573 · Views: 684651

Y Bar Ranch
Posted on: Jul 16 2015, 04:14 PM


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QUOTE (djellison @ Jul 16 2015, 11:08 AM) *
To drop from 14km/sec to 1.2km/sec ( which is what you basically have to do ) in, say, an 1800km quarter circumference of Pluto would require an average deceleration of 5G. In your example - you would have to generate even more acceleration than that! It's just not going to happen.

Whippin' out my Casio...based on the Pluto radius and a 14 km/s approach speed, you'd have to pull 17 Gs at the maximum to stay in the atmosphere. With a swag on density rho of 2 x 10^-5 kg/m^3, and a mass of entry probe of 1 KG and C_L_max of 1.5, you'd need a....really, really big wing. huh.gif
  Forum: Exploration Strategy · Post Preview: #223787 · Replies: 24 · Views: 18974

Y Bar Ranch
Posted on: Jul 16 2015, 02:50 PM


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QUOTE (Juramike @ Jul 15 2015, 09:06 AM) *
While a new thruster technology would be a welcome addition to the collective toolkit, for the purposes of this discussion we should limit it to proven and near-term available thrusters and technologies.

Does one exist in the current stable of solutions?

A place like Pluto probably (I am guessing) has an atmosphere so thin and an approach velocity so high, that there wouldn't be enough pure aerobraking available to enter into orbit, much less land without making a crater.

My thought is an aerodynamic lifting shape that will enter the atmosphere and then use lift to stay in the atmosphere, bending around the planet with the lift vector pointing down to augment gravity, until it has bled off its speed and is below escape velocity, at which time you could pop up into orbit and get down to the surface from there.

It would put Star Wars canyon to shame, flying just off the surface "upside-down". smile.gif
  Forum: Exploration Strategy · Post Preview: #223769 · Replies: 24 · Views: 18974

Y Bar Ranch
Posted on: Jul 16 2015, 02:40 PM


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QUOTE (MarkG @ Jul 16 2015, 09:10 AM) *
It is worth pointing out that with Pluto and Charon strongly tidally locked, any perturbation to one of them will quickly transfer some forces to the other. in a somewhat non-intuitive fashion. Even a seasonal sublimation/deposition mass transfer on Pluto would create a mass shift that would generate forces on Charon, which would cause different forces back on Pluto.
This could be modeled and tested....

That source of energy would be traced back to energy introduced by solar insolation, but rather than directly heating the surface it would be a kind of second order effect to the system. Still, any heat generated through that effect would have to be equal or less than just pure insolation?
  Forum: New Horizons · Post Preview: #223768 · Replies: 1286 · Views: 6842480

Y Bar Ranch
Posted on: Jun 18 2015, 02:44 PM


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QUOTE (pioneer @ Jun 18 2015, 07:27 AM) *
I'm not complaining, but I'm wondering what this mission will accomplish that the Galileo mission didn't.

Here's my thinking.

If you consider Europa as a constantly evolving system, then this is like the extension of Galileo. We can see what possibly changed in the years between the two, which is possible because they have the same instruments. Can you imagine the excitement when they go back to the same site and see significant changes in the surface coupled with changed measurements? Fingers = crossed.

But ultimately it is all about the bandwidth. Mooorrrrreee data. Fire hose instead of a dripping faucet.
  Forum: Jupiter · Post Preview: #221452 · Replies: 107 · Views: 164716

Y Bar Ranch
Posted on: Mar 12 2015, 06:02 PM


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I dream of the day when I can buy bottled water from various different planets and moons.

Be nice if a meteorite was on an intercept path with one of these bodies and we could witness the plume following impact.
  Forum: Jupiter · Post Preview: #218800 · Replies: 15 · Views: 24736

Y Bar Ranch
Posted on: Feb 6 2015, 02:20 PM


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QUOTE (Bjorn Jonsson @ Feb 5 2015, 07:53 PM) *
One problem with the white spot is that we really do not know about a possible contrast stretch in the released images (my guess though is that there is little or no contrast stretch). Also it's only bright relative to the surrounding terrain, in reality it's probably not white.

This reminds me of the joke:

Q: Why do New Yorkers wear black?
A: Because there's nothing darker.

My take is that the white spot is dark, and everything else is darker. Very curious to see if this is true.
  Forum: Dawn · Post Preview: #217756 · Replies: 756 · Views: 1651939

Y Bar Ranch
Posted on: Nov 19 2014, 09:38 PM


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QUOTE (fredk @ Nov 19 2014, 01:52 PM) *

Obviously it'd take a lot of precise planning, but if in the end game it was possible to drift down, and then blip the thrusters for the next-to-the-last-time to clean off the overlaying dust from the icy underside...
  Forum: Rosetta · Post Preview: #215538 · Replies: 390 · Views: 410185

Y Bar Ranch
Posted on: Nov 12 2014, 07:41 PM


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In my mental model I've always thought of it as more of a docking than a landing.

Can't wait to get a sense of the surface.
  Forum: Rosetta · Post Preview: #214915 · Replies: 1412 · Views: 1133077

Y Bar Ranch
Posted on: Nov 8 2014, 08:00 PM


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QUOTE (fredk @ Nov 8 2014, 10:49 AM) *
If it is a barbell, and if it formed by the joining of two bodies, I might expect the two to be more loosely connected than if it formed by the erosion of one body. In that case, around the time of greatest activity near perihelion I might expect differing jet reaction forces across the nucleus to lead to shifts in one body perpendicular to the line joining the two. That should lead to cracks (like we appear to have seen already) opening or closing near the neck. Depending on the details of the gravitational field and connection of the two joined pieces, we might even see vibrational modes - periodic opening and closing of cracks.

I can't wait for perihelion...

If it started from one body but got to its current state, I'm thinking the tidal forces between the two lobes could be enough to cause cracking and movement at the neck.
  Forum: Rosetta · Post Preview: #214681 · Replies: 614 · Views: 518271

Y Bar Ranch
Posted on: Nov 1 2014, 04:15 PM


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QUOTE (fredk @ Oct 29 2014, 09:05 PM) *
A body doesn't rotate around a point, it rotates about an axis.

Actually, to be super-pedantic about it (sorry, can't resist) rotations are best considered occurring in a plane rather than around an axis. That is why you can have rotations in a 2D world (no third axis exists to rotate around) and it is how in a 4D world you actually have 6 potential "cardinal" rotations in planes rather than just 4 about axes. Just so happens in 3D that you get one orthogonal axis per plane. smile.gif
  Forum: Rosetta · Post Preview: #214446 · Replies: 1412 · Views: 1133077

Y Bar Ranch
Posted on: Sep 26 2014, 12:12 PM


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QUOTE (Malmer @ Sep 26 2014, 12:18 AM) *
Shapemodel update.
I used a combination of stereo correlation, shape from shading and some space carving to build this mesh.
It is fairly untreated at this point and will evolve as we get access to more pictures...


Is your model available on-line? Would like to suck it into my Simple Gravity Sim and play with it.
  Forum: Rosetta · Post Preview: #213409 · Replies: 197 · Views: 284047

Y Bar Ranch
Posted on: Sep 25 2014, 01:53 PM


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QUOTE (djellison @ Sep 25 2014, 08:25 AM) *
Why? We're not in Yellowknife Bay / John Klein any more. We're in a different geological unit. That's kind of the point of driving all this way.

Well, I'll flip my question around. Based on what they thought this unit might be composed of, do the tailings meet initial expectations or are they a surprise?
  Forum: MSL · Post Preview: #213380 · Replies: 546 · Views: 409279

Y Bar Ranch
Posted on: Sep 25 2014, 12:22 PM


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QUOTE (PaulH51 @ Sep 25 2014, 04:31 AM) *
We have a "full depth hole" on sol 759

This MAHLI tells the tale

http://mars.jpl.nasa.gov/msl-raw-images/ms...074R00_DXXX.jpg

Where's the grey material? Was kind of expecting it.
  Forum: MSL · Post Preview: #213378 · Replies: 546 · Views: 409279

Y Bar Ranch
Posted on: Sep 24 2014, 12:20 PM


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QUOTE (ollopa @ Sep 23 2014, 12:15 PM) *
I realise this image release issue will be a recurring theme. However, I am told that at least one individual has already submitted a journal paper based on the compressed JPEG's. From what I hear, it was not accepted. But people are not happy. Considering the blood, sweat and tears that went into putting the OSIRIS consortium together and raising the funding, perhaps it's not so hard to understand the nervousness about being beaten to publication.

The power of crowd sourcing unleashed.

Edit: an alternative on their part to (understandably) hoarding their hard-earned data is to release it and ask the crowd to work on their behalf. At the highest resolution there might be thousands of interesting features to put eyes on, and crowd sourcing has proven to be an excellent method of data exploration.
  Forum: Rosetta · Post Preview: #213339 · Replies: 614 · Views: 518271

Y Bar Ranch
Posted on: Sep 23 2014, 11:38 AM


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QUOTE (James Sorenson @ Sep 22 2014, 11:54 PM) *
MAVEN carries no camera's.

Hmmm, I guess this story isn't true then.
http://www.theonion.com/articles/mars-mave...s-of-hig,36987/
  Forum: MAVEN · Post Preview: #213268 · Replies: 12 · Views: 27125

Y Bar Ranch
Posted on: Sep 22 2014, 12:38 PM


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My alternate boulder theory, just to populate the space of ideas. They are lumps of slower ablating material that gets left behind as the material around them is removed, until the stem holding them up collapses and they "redock" with the mother ship. So they fall close to their point of origin.
  Forum: Rosetta · Post Preview: #213236 · Replies: 614 · Views: 518271

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