Comments on: "We're solar sailing!"

"We're solar sailing!"

Burhanistan — Mon, 24 Jan 2011 14:56:58 -0800

NASA's NanoSail-D unfurled its solar sail and is now orbiting 650 km above Earth.

Background video

By: chambers

chambers — Mon, 24 Jan 2011 15:21:00 -0800

It seems there are interesting possibilities for small-scale power generation using a photovoltaic sheet as the sail, using the power generated to not only power an attached craft/object, but to use the power to steer and optimize alignment with the sun as well.

By: jquinby

jquinby — Mon, 24 Jan 2011 15:40:54 -0800

For those who want to try spotting it, Heavens Above is now listing visible passes for it as well. Too cloudy here, of course.

By: spish

spish — Mon, 24 Jan 2011 16:15:29 -0800

Can someone decode the beacon? Would be interesting to know what it's transmitting. Sounds very old school MODEM'ish.

By: stbalbach

stbalbach — Mon, 24 Jan 2011 16:25:33 -0800

The last section of the first link is interesting, sails will be used to remove satellites from orbit to prevent space-junk build-up.

By: newdaddy

newdaddy — Mon, 24 Jan 2011 16:29:21 -0800

The part of the spacecraft that was producing the beacon already ran out of power, but that was expected. The dashboard is here; http://nanosaild.engr.scu.edu/dashboard.htm

By: Splunge

Splunge — Mon, 24 Jan 2011 17:01:27 -0800

You know who else had solar sails?

By: jwells

jwells — Mon, 24 Jan 2011 17:39:50 -0800

I actually spent the weekend building a Yagi antenna from Make to try to listen to this thing and a few friends. If you can pull it in you can report the beacons here. Pharmasat and OOREOS are also out there, thankfully, since NanoSail seems to have conked out battery wise. You'll need to track them using TLEs you can find online and you'll need a good 400-500Mhz radio you can connect to a computer too. I had trouble finding the 1/8in brass rods for the antenna and instead used 1/4in copper ones, which doesn't seems to have worked all. Great regular FM antenna though. :-)

By: ChrisHartley

ChrisHartley — Mon, 24 Jan 2011 17:55:57 -0800

I think using thicker rods will just give you more bandwidth - better SWR rating across a larger range of frequencies.

By: CynicalKnight

CynicalKnight — Mon, 24 Jan 2011 18:30:32 -0800

[GROUND CONTROL] FASTSAT, you are go to deploy probe. [FASTSAT] Acknowledge capcom;probe deploy [FASTSAT] Error Recover;probe deploy [FASTSAT] ERROR OVERRIDE;probe deploy [NANOSAIL-D] no [FASTSAT] Unknown Error;probe deploy [NANOSAIL-D] no [NANOSAIL-D] dont wanna [FASTSAT] Query;Failure Cause [NANOSAIL-D] dont wanna go out [GROUND CONTROL] Probe, please deploy. [NANOSAIL-D] nonononono [FASTSAT] Capcom;Alternate Program Requested [GROUND CONTROL] Just leave the door open - he'll get bored and deploy eventually [NANOSAIL-D] no i wont [GROUND CONTROL] oh yes you will [FASTSAT] Contrary Instructions;Capcom Override;Wait Loop Initiated . (6 weeks later) . [NANOSAIL-D] oohhh lookit my sail im all shiny [GROUND CONTROL] Toldya [FASTSAT] sonofabitch

By: newdaddy

newdaddy — Mon, 24 Jan 2011 19:14:57 -0800

Two other things worth mentioning; Japan recently successfully deployed and used their own solar sail, and Nanosail D has gotten a lot of attention on the alway excellent blog, Centauri Dreams.

By: LobsterMitten

LobsterMitten — Mon, 24 Jan 2011 20:33:59 -0800

Solar sails work by harnessing the pressure of sunlight. Units of light called photons generate miniscule levels of thrust when they collide with a solar sail, much like a kite or sailboat responds to wind. They don't generate much thrust, but sails can propel lightweight spacecraft long distances into the solar system on timescales much faster than chemical rockets.

Coooool.

By: eye of newt

eye of newt — Mon, 24 Jan 2011 20:56:28 -0800

There's a solar sail wiki. I learned that a solar sail can be used to get closer to or farther away from the sun. There's also the book, edited by Arthur C Clarke in 1990 with several short stories about solar sails, along with a proposal for a solar sail race around the moon. Life is finally catching up with science fiction. Maybe it is time for such a race!

By: zoogleplex

zoogleplex — Mon, 24 Jan 2011 22:05:47 -0800

Just remember, to use a solar sail to move any really substantial mass (like a manned spaceship) around, it needs to be very, very, very big. Like many kilometers across big. It may be a while before we can figure out how to reliably deploy a 5km-wide microns-thin sheet, let alone have it keep its shape and be effectively steerable. Still, this is pretty rad that they're getting them to work and there's already potential practical applications. Good show NASA!

By: tommasz

tommasz — Tue, 25 Jan 2011 06:50:10 -0800

Solar sails make me think of Cordwainer Smith.

By: Kabanos

Kabanos — Tue, 25 Jan 2011 09:00:29 -0800

Just remember, to use a solar sail to move any really substantial mass (like a manned spaceship) around, it needs to be very, very, very big. Like many kilometers across big. Just give me a space suit and a trapeze harness and I'll go out on the wire. Japan recently successfully deployed and used their own solar sail. Could this be the start of a new Vendee Globe?

By: newdaddy

newdaddy — Tue, 25 Jan 2011 09:13:19 -0800

They don't need to be "very very very big", unless you've got a bus to catch. I believe that, post launch, JHU/APL mission ops had to make a corrective thruster firing on NASA's Messenger mission to account for the solar pressure on the heat shield, for instance.

By: zoogleplex

zoogleplex — Tue, 25 Jan 2011 10:13:54 -0800

You are of course right, newdaddy: to get anything resembling rapid acceleration, it needs to be huge. It's true that solar wind pressure has measurable effects on even probes with small cross-sections and always needs to be taken into account. How much sail you need depends on how much mass you want to move and how fast you want it to go; to get a big probe to Jupiter in six months, or to send something at relativistic speed to another solar system, you need a really big sail. It'll be interesting to see how this scales up from Nanosail D, which you can hold in one hand!

By: Galaxor Nebulon

Galaxor Nebulon — Tue, 25 Jan 2011 12:52:03 -0800

Man, Nanosail-D is so much weaker than IKAROS. Normally, I'd be all "that's sweeeet!" but instead I'm like "*yawn* wake me when a sail gets to Jupiter".