Starship Asterisk*

[quote=MarkBour post_id=290609 time=1552595693 user_id=141361]
[quote=JohnD post_id=290565 time=1552415616 user_id=100329]

That stirred up a storm of gravel!
But what draws the bits into the collection horn (just above centre view?)
A nice fan wouldn't help. Is the gravel charged? would an electric field draw them in?[/quote]
I guess they just expect a certain amount of the material to fall into the trough. They ran a bunch of simulations. :-)

The subsurface collection plan is also pretty simple. They're going to fire a larger blast at Ryugu and actually wait two weeks for the dust to clear, descend into the bottom of the crater they just made, and do the same thing we saw here, another tanatalum [sic] bullet, I guess, and catch debris that is kicked up at the bottom of the crater. Presumably it will be material interior to Ryugu.

We're not a very polite species. Shoot first, ask questions later.[/quote]
[list]It would be a shame if the pristine asteroid material moved just out of Tantalum's grasp :!: [/list]
[quote="https://en.wikipedia.org/wiki/Tantalum"]

[float=left][img3="Tantalum was discovered in Sweden by A. Ekeberg"]https://upload.wikimedia.org/wikipedia/commons/thumb/3/33/Anita_Ekberg_1956.jpg/220px-Anita_Ekberg_1956.jpg[/img3][/float]

<<Tantalum is a chemical element with symbol Ta and atomic number 73. Previously known as tantalium.

The name tantalum was derived from the name of the mythological Tantalus, the father of Niobe in Greek mythology. In the story, he had been punished after death by being condemned to stand knee-deep in water with perfect fruit growing above his head, both of which eternally tantalized him. (If he bent to drink the water, it drained below the level he could reach, and if he reached for the fruit, the branches moved out of his grasp.) A. Ekeberg wrote "[b][i][color=#0000FF]This metal I call tantalum ... partly in allusion to its incapacity, when immersed in acid, to absorb any and be saturated.[/color][/i][/b]"[/quote]

[quote=JohnD post_id=290565 time=1552415616 user_id=100329]
That stirred up a storm of gravel!
But what draws the bits into the collection horn (just above centre view?)
A nice fan wouldn't help. Is the gravel charged? would an electric field draw them in?

John
[/quote]
I guess they just expect a certain amount of the material to fall into the trough. They ran a bunch of simulations. :-)

The subsurface collection plan is also pretty simple. They're going to fire a larger blast at Ryugu and actually wait two weeks for the dust to clear, descend into the bottom of the crater they just made, and do the same thing we saw here, another tanatalum bullet, I guess, and catch debris that is kicked up at the bottom of the crater. Presumably it will be material interior to Ryugu.

We're not a very polite species. Shoot first, ask questions later.

[float=left][img3="Grose red perigrine falcon egg"]https://upload.wikimedia.org/wikipedia/commons/thumb/8/87/Falco_peregrinus_MWNH_0671.JPG/1024px-Falco_peregrinus_MWNH_0671.JPG[/img3][/float][quote=MarkBour post_id=290567 time=1552417357 user_id=141361]

I read that "hayabusa" is the Japanese word for "perigrine falcon".

Tame peregrine striking a red grouse, by Louis Agassiz Fuertes (1920)

They certainly are going with a pretty inventive way to gather samples.[/quote]
:arrow: [size=150][b][color=#FF0000]Grose red perigrine falcon egg[/color][/b][/size]

[img2]https://www.asteroidmission.org/wp-content/uploads/2018/06/BennuRyuguComparison.png[/img2]

[float=left][attachment=0]Capture.png[/attachment]
Tame peregrine striking a red grouse, by Louis Agassiz Fuertes (1920)
[/float]
.

I read that "hayabusa" is the Japanese word for "perigrine falcon".

They certainly are going with a pretty inventive way to gather samples.

That stirred up a storm of gravel!
But what draws the bits into the collection horn (just above centre view?)
A nice fan wouldn't help. Is the gravel charged? would an electric field draw them in?

John

Science is amazing. :saturn:

Amazing photography! 8-)

Touchdown!!!!! 6 points!!!! Now for the extra point...

Nice video...
:---[===] *

[url=https://apod.nasa.gov/apod/ap190312.html] [img]https://apod.nasa.gov/apod/calendar/S_190312.jpg[/img] [size=150]Touchdown on Asteroid Ryugu[/size][/url]

[b] Explanation: [/b] Last month, humanity bounced a robot off an asteroid. The main reason was to collect a surface sample. Despite concern over finding a [url=https://apod.nasa.gov/apod/ap181101.html]safely reboundable[/url] touchdown spot, [url=https://en.wikipedia.org/wiki/Japan]Japan[/url]'s robotic [url=https://en.wikipedia.org/wiki/Hayabusa2]Hayabusa2[/url] spacecraft successfully [url=http://www.planetary.org/blogs/jason-davis/hayabusa2-touchdown-video.html]touched down[/url] -- and bounced right back from -- asteroid Ryugu. Before impact, Hayabusa2 fired a small bullet into [url=https://en.wikipedia.org/wiki/162173_Ryugu]162173 Ryugu[/url] to scattered surface material and increase the chance that [url=https://www.youtube.com/watch?v=-3hO58HFa1M&t=15]Hayabusa2[/url] would be able to capture some. Next month, [url=http://www.planetary.org/blogs/jason-davis/hayabusa2-touchdown-recap.html]Hayabusa2 will fire[/url] a much larger bullet into [url=https://apod.nasa.gov/apod/ap180924.html]Ryugu[/url] in an effort to capture sub-surface material. Near the end of this year, Hayabusa2 is scheduled to depart [url=https://apod.nasa.gov/apod/ap180822.html]Ryugu[/url] and begin a looping trip back to Earth, hopefully returning small pieces of this [url=https://apod.nasa.gov/apod/ap181113.html]near-Earth asteroid[/url] in late 2020. [url=http://global.jaxa.jp/article/2014/interview/vol88/]Studying Ryugu[/url] could [url=https://twitter.com/haya2e_jaxa]tell humanity[/url] not only about the [url=https://solarsystem.nasa.gov/small-bodies/asteroids/in-depth/]minor planet[/url]'s surface and interior, but about what materials were available in the early [url=https://solarsystem.nasa.gov/solar-system/our-solar-system/in-depth/]Solar System[/url] for the [url=https://en.wikipedia.org/wiki/Abiogenesis]development of life[/url].


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