Asteroid Mining by 'Planetary Resources' |
Asteroid Mining by 'Planetary Resources' |
Apr 25 2012, 06:26 PM
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#16
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Solar System Cartographer Group: Members Posts: 10229 Joined: 5-April 05 From: Canada Member No.: 227 |
Impact in Western Australia? When there are so many other places just crying out to be obliterated? No, I prefer the idea of lunar orbit.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Apr 25 2012, 08:48 PM
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#17
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
Renting out a suitable target area could be a lucrative business for somebody - make everyone in Greenland a millionnaire perhaps??? Obviously there would have to be strict limits on chunk size and velocity. The timing of events would be known in advance so there would be time to fit earplugs and retire to a shelter for those not wanting to witness the impacts live.
(Come to think of it - there's another business opportunity. Impact tourism! Specially designed hotels with bomb-proof observation lounges. Even special vehicles for the most daring: you know, the sort of folks who just can't get close enough to a tornado . .) |
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Apr 25 2012, 10:52 PM
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#18
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
Actually - smallish, metalic asteroids don't make for an easy entry - they tend to air-burst at a few km up.
If, say, a 10m iron asteroid was able to impact (7.5km/sec being the impact speed) you're talking about a 100x25m crater. http://www.convertalot.com/asteroid_impact_calculator.html Or much bigger according to http://impact.ese.ic.ac.uk/cgi-bin/crater....&tdens=2500 A >10km/s impact is more likely - and that's more likely to air-burst. http://simulator.down2earth.eu/ is also fun. The lithbraking method of Earth arrival is not one I would recommend or support. |
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Apr 25 2012, 11:55 PM
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#19
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Member Group: Members Posts: 723 Joined: 13-June 04 Member No.: 82 |
I very much doubt that PRI intends to return the entire asteroid to Earth -- for one thing, the energy costs alone would be enormous. They may or may not transport the asteroid to high lunar orbit, but in my non-expert opinion, the most cost-effective route would be to process the asteroid in situ using the abundant solar power to heat the material. A light-weight parabolic mirror could concentrate solar radiation into a solar furnace, with the focus capable of reaching almost the temperature of the surface of the sun, enough to vaporize any material.
One approach would be something like fractional vaporization, with the pulverized asteroidal material being brought to successively higher temperatures. The less refractory material, including all the bound volatiles, would be boiled off at the start, with successively higher boiling-point materials vaporizing as the temperature increases. If the sunlight is concentrated along a straight line, with increasing temperatures along its length, the metal vapor that is released at the boiling points of each of the metals that it would be worthwhile to transport back to Earth (the PGMs and Gold) could be collected by vapour deposition. The fact that this would be done in a vacuum should make this relatively easy. Of course this process would be horribly inefficient of energy, but once the mirror is deployed, it's all free of charge. There's plenty of available energy there, it just needs to be collected. Some numbers: Element / Boiling Point / Concentration * / Current Spot Price per Troy Ounce / Current Value of Element in 1 Million Tonne Iron asteroid (~50m diameter) Au / 3129K / 0.6 ppm / $1,642 / $31.678 million Pd / 3236K / 1.2 ppm / $662 / $25.543 million Rh / 3968K / 8.6 ppm / $1,385 / $382.990 million Pt / 4098K / 63.8 ppm / $1,552 / $3183.846 million Ru / 4423K / 45.9 ppm / $115 / $169.727 million Ir / 4701K / 31.0 ppm / $1,085 / $1081.511 million Os / 5285K / 31.3 ppm / $380 / $382.444 million Re / 5869K / 2.4 ppm / $143 / $11.035 million Each ppm equals one tonne of the metal in a 1 million tonne asteroid. The total value at current spot prices would be $5269.774 million, and the mass would be just under 185 tonnes, much easier to transport to Earth than 1 million tonnes! Of course the prices would be a lot lower with these quantities of PGMs available -- which would be all to the good in my opinion, these metals are very useful in various applications, but are heavily limited by their cost. Of course other metals might be valuable enough to refine and transport to Earth as well. For example, pure Germanium metal is currently selling for $1275/Kg, so that would be another $44.625 million from a million-tonne 98 % Fe asteroid, and a whopping $1300 million from an LL Chondrite asteroid of the same mass. There may be other metals that would be worth extracting as well. * The Role of Near-Earth Asteroids in Long-Term Platinum Supply Where "98th % Fe" means that the results are for the 98th percentile iron meteorite, ranked by PGM content. Actually, even an ordinary Chondritic asteroid (much more common) massing 1 million tonnes has about half the value** in PGMs and Gold of the rarer high-end Iron asteroid (plus as I said above, $1300 million worth of Germanium). So maybe just about ANY Iron or Chondritic asteroid would do! ** The reason being that on Earth, almost all the PGMs, being almost inert chemically, sank to the earth's core during its differentiation, so the Earth's crust is heavily depleted compared to the undifferentiated Chondritic asteroids, much less the PGM-enhanced iron cores of the differentiated but now disrupted asteroids. |
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Oct 18 2014, 10:19 AM
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#20
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
Planetary Resources' first small space telescope to fly later this month
http://www.bizjournals.com/seattle/news/20...ry.html?ana=twt |
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Oct 29 2014, 06:34 AM
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#21
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
as you probably know by now, Planetary Resources' first small space telescope has been destroyed in tonight's Antares launch mishaps
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Oct 29 2014, 01:30 PM
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#22
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
Arkyd 3 wasn't their first telescope - it was a technology demonstration 3U cubesat. Still a tragic loss along with RACE, another 28 satellite flock from PLanet Labs and all the other ISS resupply hardware.
http://www.geekwire.com/2014/arkyd-3/ "On board are Planetary Resources’ initial designs for a computer system, a power system, a communications system, an attitude determination system (determining the direction the satellite is pointing relative to the stars) and many other technologies that Planetary Resources plans to continue working on as it develops future versions of spacecraft in the Arkyd line." |
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Oct 29 2014, 08:42 PM
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#23
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
you are right, of course...
a release from Planetary Resources; http://www.planetaryresources.com/2014/10/...ly-another-day/ |
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