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Results tagged with solar-sail
Search options questions only
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user 12102
Questions regarding a 'sail' that can be attached to spacecraft to harness the sun's radiation to propel a ship in one direction or another.
4
votes
2
answers
302
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What is the functional form for r(t) for a solar-sail deorbit into the Sun?
This answer describes a spacecraft in a heliocentric orbit using a solar sail to "deorbit" into the Sun by reflecting sunlight into roughly the prograde direction. In comments it was proposed that whi …
- 151k
7
votes
1
answer
416
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Negative photon pressure? What is the physics behind this expression?
The Wikipedia article on Radiation Pressure gives an equation for the pressure on a perfect reflector produced by a beam of photons with an energy flux $E_f$ (in units of power/area) as
$$P=\frac{2E_ …
- 151k
5
votes
1
answer
194
views
Why do "Relativistic Light Sails Need to Billow"?
The University of Pennsylvania School of Engineering and Applied Science blogpost How to Design a Sail that Won’t Tear or Melt on an Interstellar Voyage
links to two new Nano Letters papers:
Matthew …
- 151k
2
votes
1
answer
597
views
Total delta-v expected from Lightsail-2's solar sail before end of mission, and why end it s...
While Bill Nye has recently gotten quite upset at us for some things (strong language for Bill Nye warning), in the video below he expresses heartfelt thanks to all members of the Planetary Society an …
- 151k
3
votes
0
answers
223
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Where will the DSCOVR mission Falcon 9 2nd stage rocket body end up?
This answer to Why would a mission to Sun-Earth L1 have an instantaneous launch window? suggests that this was quite a delta-v-intensive launch. It left the F9 2nd stage in a very high 17 day orbit ar …
- 151k
0
votes
1
answer
232
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Would the Poynting–Robertson effect ever be faster than a solar sail from a 1 AU orbit to th...
In this answer to Do you need 0 km/s velocity to crash into the sun? I mention solar sails for retrograde thrust and the Poynting–Robertson as two ways an object could ever-so-slowly spiral into the S …
- 151k
3
votes
1
answer
154
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How will The Planetary Society's LightSail 2 Spacecraft's retroreflectors be used?
For more information and links on The Planetary Society's LightSail 2 and its corner cube retroreflectors, see the question Planetary Society's LightSail Spacecraft's corner cube reflectors; how large …
- 151k
3
votes
1
answer
282
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How will NEA Scout control its attitude during deep space flight & keep its camera steady wi...
Phil Plait's Bad Astronomy's Fly Me to the Moon and Then to a Near-Earth Asteroid describes Near Earth Asteroid Scout (NEA Scout, or just Scout) a 6U cubesat that will be deployed from Artemis somewhe …
- 151k
4
votes
1
answer
156
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Are solar sail spirals logarithmic? Can this be shown analytically or by dimensional analysi...
There are several questions and answers here about spiraling towards or away from the Sun using solar sails tilted by roughly 45 degrees to convert the sunlight's incoming radial momentum into tangent …
- 151k
3
votes
1
answer
450
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What is the optimal angle for a solar-sail deorbit towards the Sun when radial thrust is inc...
In this answer there's a geometrical derivation of the optimal angle of a solar sail to deorbit a spacecraft into the Sun.
The naive answer is 45° which would direct the reflected light directly prog …
- 151k
7
votes
1
answer
283
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Planetary Society's LightSail Spacecraft's corner cube reflectors; how large, and corrected ...
The Planetary Society's new 3U cubesat LightSail spacecraft (mentioned in this answer) has corner-cube retroreflectors on on the 10x10 cm +z end, facing directly away from the sail, which will be Eart …
- 151k
6
votes
3
answers
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How will JWST manage solar pressure effects to maintain attitude and station keep it's unsta...
The James Webb Space Telescope presents a huge reflective cross-section to the Sun's photons, and this can generate both torque and thrust.
How will JWST manage solar pressure effects to maintain at …
- 151k
2
votes
1
answer
346
views
Would the Yarkovsky effect ever be faster than a solar sail from a 1 AU orbit to the Sun?
Previously I'd mistakenly asked Would the Poynting–Robertson effect ever be faster than a solar sail from a 1 AU orbit to the Sun? when I'd meant to ask about the Yarkovsky effect which can be much st …
- 151k
1
vote
1
answer
373
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Why did my vis-viva math solution get so close despite being wrong? Under what conditions wo...
I tried to answer Equation for Velocity and distance from Sun of a solar sail powered spacecraft but I'm missing something.
I set up a math solution and got about 0.4 year to reach zero velocity based …
- 151k
3
votes
1
answer
221
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Will the Planetary Society's LightSail spacecraft's solar panels be articulated during each ...
The NYTimes article Review: ‘Bill Nye: Science Guy,’ a Portrait of a Fighter for Facts includes a link to the film's trailer on YouTube and a photo of Bill Nye with a model of a 3U cubesat attached to …
- 151k