Postcards from the Bleeding Edge
Tuesday, November 15, 2005

  Hayabusa Nightmare

Went to sleep with the image of Minerva helplessly drifting away from Hayabusa. Had a dream with alarms going off like 1201! 1202! Watched Columbia cover the skies of texas in fire. Saw Beagle burn up and the Mars Polar Lander fall its last few hundred meters. Watched Ranger 4 hit the other side of moon silently, where no one else but my dream self could see it.

Eventually I woke up, still hearing 1201! 1201! in my head, even now, as I write...

... knowing that ultimately - the Eagle, landed.

I'd like to write at the end of this week - the Falcon has landed. Something like that would make nightmares like tonight's worth it.

Bonus link - the Apollo 11 crew addresses congress
 
Sunday, November 13, 2005

  Life on Aten Asteroids?

One of the reasons I'm big on asteroids in Aten orbits is that they have a surface temperature range that passes through what is required for life. 2062 Aten, the lead asteroid in the class, has a mean surface temp of 275 degrees kelvin, which translates out to 35 degrees fahrenheit - chilly, but survivable. I don't have any data on the temperature range (min and max) such asteroids go through, but it stands to reason that some have a range of surface or interior temps within the known earth-life-and hardware survivable range. Still looking for data... I think there is an ideal temp range for spacecraft and habitable structures, but I don't know what it is. (hardened COTS computer hardware has a comfort zone of -40c to +80c - some might say -40 to +100c is feasible - but what of the other components?)

And what kind of raw materials would be available on a typical aten? Too hot, and you have no volatiles. Too cold, and cellular metabolisms can't function. Construction of shelter is easy, use an instant shelter, and just add water.... Or adapt a spacehab... you might want to burrow down a dozen meters both for insulation and extra radiation shielding.

The main problem is getting rid of heat in a near vacuum, there would have to be a heat exchanger mounted in the crust. You need one anyway, to boil out various volatiles.

Transport back from an Aten is straightforward - if you use a restartable engine like the Vulcain or the RS-72. Same fuel (NTO/MMH) that took you out takes you in, but this time you end up in Earth orbit with plenty of extra fuel. How much extra fuel typically? Take a wild guess (and comment). (take a look at an Ariane upper stage dry and wet, that should help...)

Wouldn't it be cool if something like a hydrogen-sulfide metabolism could survive on an asteroid?

I've been worrying a bit about the newly discovered class of Aphohele asteroids, which orbit just inside Earth's orbit. While only 2 have been definitively discovered, at least 50 are projected to exist. As they spend most of their time in the Sun's glare, they are very hard for Spaceguard in its present form to spot.

Mean surface temp on 2003 CP20 is a blistering 323K (122F).

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  Minerva Misses

I so wanted to wake up this morning to some stereo closeup photographs from the Hayabusa probe -- but it appears that a sign got flipped and Minerva was launched away from Itokowa rather than towards it.

From MSNBC:

Here's to hoping next week's landing goes ok.
 
David Täht writes about politics, space, copyright, the internet, audio software, operating systems and surfing.


Resume,Songs,
My new blog, NeX-6, My facebook page
Orgs I like
The EFF - keeping free speech in the world
Musical stuff I like
Jeff, Rick, Ardour, Jack
Prior Rants - Wireless and Wifi in 2015 - not what I dreamed of Saving wifi! Fixing Bufferbloat! Fighting the vend... Virgin Media - Fixing the epidemic of bufferbloat ... 49... and trying to find my navel Wheels down on mars! Tracking the landing of Curiosity, from Seattle spotting NEOs from around venus's orbit Asteroids as lunar orbit resources SOPA is bad news Departing France for England, then 'home'.
Best of the blog:
Uncle Bill's Helicopter - A speech I gave to ITT Tech - Chicken soup for engineers
Beating the Brand - A pathological exploration of how branding makes it hard to think straight
Inside the Internet Mind - trying to map the weather within the global supercomputer that consists of humans and google
Sex In Politics - If politicians spent more time pounding the flesh rather than pressing it, it would be a better world
Getting resources from space - An alternative to blowing money on mars using NEAs.
On the Columbia - Why I care about space
Authors I like:
Doc Searls
Where's Cherie?
UrbanAgora
Jerry Pournelle
The Cubic Dog
Evan Hunt
The Bay Area is talking
Brizzled
Zimnoiac Emanations
Eric Raymond
Unlocking The Air
Bob Mage
BroadBand & Me
SpaceCraft
Selenian Boondocks
My Pencil
Transterrestial Musings
Bear Waller Hollar
Callahans
Pajamas Media BlogRoll Member

If you really want to, you can poke through the below links as well.

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