Author Topic: Cleaning up near earth space  (Read 34778 times)

Offline Proponent

  • Senior Member
  • *****
  • Posts: 5596
  • Liked: 1142
  • Likes Given: 684
Re: Cleaning up near earth space
« Reply #120 on: 04/01/2010 12:33 AM »
For higher debris, the sail will be pointed towards the sun, and pushed along by solar radiation.

Ah, radiation pressure.  Hadn't thought of that; thanks for setting me straight.

I'm still wondering about the potential for the 25-square-meter to generate debris of its own.

Offline tamarack

  • Full Member
  • **
  • Posts: 275
  • Liked: 0
  • Likes Given: 0
Re: Cleaning up near earth space
« Reply #121 on: 04/01/2010 03:17 AM »
What orbits will this be used in? I'd guess high inclination LEO and GTO.
For debris in low Earth orbit, the sail will be angled so that residual air particles in the upper atmosphere slow it down, causing it to lose altitude. For higher debris, the sail will be pointed towards the sun, and pushed along by solar radiation.

http://www.guardian.co.uk/science/2010/mar/26/space-sail-orbit-debris

Interesting. For higher debris, would one side of the sail reflect, and the other absorb solar radiation to degrade the orbit? Rather than make the orbit elliptical with two reflective sides, bringing the perigree into the atmopshere for decay (which would likely take longer than the sail would last). Any clarification?
« Last Edit: 04/01/2010 03:20 AM by tamarack »

Offline Patchouli

  • Senior Member
  • *****
  • Posts: 4417
  • Liked: 189
  • Likes Given: 382
Re: Cleaning up near earth space
« Reply #122 on: 04/01/2010 04:07 AM »
Actually such a concept will be tested by Poland's first satellite PW-Sat
This cubesat is due to launch on the first Vega flight

I kinda wish they would quit putting this experiment on prototype rockets and just have it launched as a secondary payload on an EELV.

Offline Proponent

  • Senior Member
  • *****
  • Posts: 5596
  • Liked: 1142
  • Likes Given: 684
Re: Cleaning up near earth space
« Reply #123 on: 04/01/2010 10:13 AM »
For higher debris, would one side of the sail reflect, and the other absorb solar radiation to degrade the orbit? Rather than make the orbit elliptical with two reflective sides, bringing the perigree into the atmopshere for decay (which would likely take longer than the sail would last). Any clarification?

A more effective strategy would be to turn the sail edge on to the sun at times when you don't want light pressure.  An absorbing sail will still tend to produce thrust, though less than a reflecting sail.  Exactly how much thrust depends on the details of how the sail cools, since the cooling radiation also produces thrust.

Online kevin-rf

  • Elite Veteran
  • Senior Member
  • *****
  • Posts: 8654
  • Overlooking the path Mary's little Lamb took..
  • Liked: 1125
  • Likes Given: 245
Re: Cleaning up near earth space
« Reply #124 on: 07/16/2010 12:04 PM »
Bad news for natural cleaning of LEO, the upper atmosphere collapsed to it's lowest levels in the recorded history of space flight due to the extreme solar min.

http://science.nasa.gov/science-news/science-at-nasa/2010/15jul_thermosphere/

If you're happy and you know it,
It's your med's!

Offline Space Pete

Re: Cleaning up near earth space
« Reply #125 on: 08/16/2010 01:34 PM »
China Top of Orbital Garbage Heap, Study Shows.
http://news.discovery.com/space/china-top-of-orbital-garbage-heap-study-shows.html

Giant Nets Could Some Day Capture Space Trash.
www.pcworld.com/article/203263/giant_nets_could_some_day_capture_space_trash.html

Giant nets could remove orbiting space junk.
www.physorg.com/news201229702.html
« Last Edit: 08/17/2010 04:36 PM by Space Pete »
NASASpaceflight ISS Editor

Offline Space Pete

Re: Cleaning up near earth space
« Reply #126 on: 09/03/2010 09:12 PM »
Russian Physicists Developed Space Debris Tracker.

A group of scientists from Lebedev Physical Institute (FIAN) have developed a unique special tracker and SW which can be used to search for small space debris from 1 to 10 cm.
Space debris problem is rather critical today, as there are about 100 thousand debris of non-operational spacecraft, parts of upper stages, bolts, nuts, etc. are in orbit. However even a 1 cm object can impose serious damage for a satellite.
To search for debris, Russian scientist propose to use a refractor with an input eye of 50 mm. It can see debris at range of several hundreds of kilometers, and could be installed on any spacecraft.
Special SW helps the tracker to recognize space debris. The tracker is also capable of defining orientation of the carrier-spacecraft.
FIAN proposes to install the tracker on the spacecraft intended for 600-800 km orbits, or GSO, for which the space debris problem is the most actual.
The opportunity to install FIAN's trackers on some Russian satellites is under discussion, RIA Novosti informs.

Source.
NASASpaceflight ISS Editor

Offline jimgagnon

  • Full Member
  • ****
  • Posts: 610
  • Liked: 0
  • Likes Given: 1
Re: Cleaning up near earth space
« Reply #127 on: 11/27/2010 04:52 PM »
Russia To Spend 2 Bln Dollars For Space Clean-Up

"Russia's Rocket and Space Corporation Energia announced Tuesday that it will build a special orbital pod designed for sweeping-up the near-Earth space from satellite debris."

http://www.spacedaily.com/reports/Russia_To_Spend_2_Bln_Dollars_For_Space_Clean_Up_999.html

Offline Jim

  • Night Gator
  • Senior Member
  • *****
  • Posts: 32484
  • Cape Canaveral Spaceport
  • Liked: 11259
  • Likes Given: 333
Re: Cleaning up near earth space
« Reply #128 on: 11/27/2010 04:54 PM »
Russia To Spend 2 Bln Dollars For Space Clean-Up

"Russia's Rocket and Space Corporation Energia announced Tuesday that it will build a special orbital pod designed for sweeping-up the near-Earth space from satellite debris."

http://www.spacedaily.com/reports/Russia_To_Spend_2_Bln_Dollars_For_Space_Clean_Up_999.html

Not believable.  They don't have the money

Online kevin-rf

  • Elite Veteran
  • Senior Member
  • *****
  • Posts: 8654
  • Overlooking the path Mary's little Lamb took..
  • Liked: 1125
  • Likes Given: 245
Re: Cleaning up near earth space
« Reply #129 on: 11/27/2010 05:31 PM »
More interesting it will be nuclear powered and dump some 600+ GEO derelicts into the ocean. That is quite th DeltaV...
If you're happy and you know it,
It's your med's!

Offline savuporo

  • Senior Member
  • *****
  • Posts: 5155
  • Liked: 985
  • Likes Given: 343
Re: Cleaning up near earth space
« Reply #130 on: 11/27/2010 05:48 PM »
Not sure if Joe Carroll's EDDE was in this thread yet ?
He did a presentation on this recently on SSI Space Manufacturing 14 conference, and made a case for collecting LEO aluminium "scrap" as the first in situ space resource to be utilized.

http://www.amostech.com/TechnicalPapers/2010/Posters/Levin.pdf
« Last Edit: 11/27/2010 05:49 PM by savuporo »
Orion - the first and only manned not-too-deep-space craft

Tags: