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28 junio 2011 2 28 /06 /junio /2011 23:45

Six astronauts were forced to take refuge aboard the ISS’s “lifeboat” crafts , bracing for the threat of a collision with floating space debris.

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Los seis tripulantes de la Estación Espacial Internacional, integrantes de la 28° misión permanente en la plataforma orbital, enfrentaron una emergencia sobre las 12.00 GMT al estar a punto de ser impactados por basura espacial: “Los restos fueron identificados demasiado tarde para que la estación pueda hacer una maniobra para evitar el impacto. Los seis miembros de la tripulación recibieron la orden de permanecer a bordo de la nave espacial Soyuz”, aseguró la fuente.

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The International Space Station is seen with the docked space shuttle Endeavour in this photo provided by NASA and taken May 23, 2011. REUTERS/NASA/Handout

The International Space Station is seen with the docked space shuttle Endeavour in this photo provided by NASA and taken May 23, 2011.

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Los astronautas de la ISS evacuados por riesgo de impacto vuelven a la estación

[foto de la noticia]
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28/06/2011

La basura espacial que obligó a los tripulantes de la Estación Espacial Internacional (ISS) a refugiarse en las naves Soyuz pasó a unos 250 metros de la plataforma, según fuentes del sector aeroespacial ruso.

“A la tripulación se le dijo que la basura pasó al lado de la estación y que podían dejar las naves Soyuz“, dijeron las fuentes, citadas por la agencia Interfax.

Los seis ocupantes de la Estación Espacial Internacional (ISS) han sido evacuados a las dos naves Soyuz, que se encuentran acopladas a la estación. La evacuación de debió a la llegada de restos -cuyo rigen aún no ha sido precisado- que se acercaban a la Estación Espacial Internacional, según ha anunciado la agencia de noticias Interfax citando a una fuente espacial rusa.

Según datos preliminares, la emergencia se produjo sobre las 12.00 GMT.

“Los restos fueron identificados demasiado tarde para que la estación pueda hacer una maniobra para evitar el impacto. Los seis miembros de la tripulación recibieron la orden de permanecer a bordo de la nave espacial Soyuz”, aseguró la fuente.

Dos naves acopladas

Los cosmonautas rusos Alexandr Samokutiáyev y Serguéi Vólkov y el astronauta de la NASA Ronald Garan subieron a bordo de la Soyuz TMA-21. Mientras que el ruso Andréi Borisenko, el estadounidense Michael Fossum y el japonés Satosi Furukawa se refugiaron en la Soyuz TMA-02M, precisó la fuente.

Los seis tripulantes de la EEI integran la vigésimo octava misión permanente en la plataforma orbital.

Tras ser contactado por AFP, el centro de control de vuelos espaciales de Rusia (TSOUP) no pudo confirmar esta información. “No tenemos ninguna información al respecto. No podemos ni confirmar ni negar esta información”, dijo un portavoz del TSOUP.

Según el portavoz, cuando la ISS se ve amenazada por la basura espacial, se ordena a la tripulación que suba a bordo de la cápsula de rescate para poder dejar la estación si fuese necesario.

“Este es el procedimiento normal para evacuar y salir de la estación, si es necesario. Esto no es un procedimiento extraordinario. Ellos (los astronautas) tienen instrucciones permanentes en ese sentido”, dijo el portavoz.

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No es la primera vez que las tripulaciones de la estación espacial han luchado para protegerse de la basura espacial. Los equipos están habitualmente en estado de alerta para prepararse para salir del peligro. Tres miembros de la tripulación se vieron obligados a evacuar brevemente la estación espacial en un incidente en marzo de 2009.

La estación espacial Internacional es un proyecto de $ 100 mil millones donde participan 16 naciones y la construcción se realiza a unas 220 millas sobre la Tierra desde 1998 – está normalmente tripulada por tres rusos, dos estadounidenses y un astronauta japonés.

Sólo el 10 por ciento de todos los objetos en órbita de la Tierra son satélites, mientras que el resto es basura: cohetes usados, satélites difuntos, bloques de aceleración y otros restos. Incluso los objetos pequeños representan un peligro para los astronautas en órbita, ya que la basura del tamaño de un huevo puede viajar a velocidades peligrosas.

El campo minado de basura espacial es un peligro cada vez mayor para los satélites en órbita y constituye uno de los retos más importantes de futuras empresas orbitales.

“Toda la basura está espaciada sólo a unos 100 metros de resto en resto. Un satélite se interpone en el camino del siguiente. “La ruta está saturada”, dijo Vladimir Gubarev, un periodista del espacio de renombre y el portavoz del Soviet de la articulación de la misión Apolo-Soyuz de 1975.

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Space debris risks colliding with orbital station

MOSCOW | Tue Jun 28, 2011 9:31pm IST

(Reuters) – Six astronauts were forced to take refuge aboard the International Space Station’s “lifeboat” crafts on Tuesday, bracing for the threat of a collision with floating space debris, the Russian space agency said.

“A situation arose linked to unidentified ‘space trash’ passing very close to the space station. The crew was told to take their places aboard the Soyuz spacecraft,” Roskomos said in a statement.

The space junk narrowly missed the vulnerable orbiting station by just 250 meters (820 feet) on Tuesday as astronauts were prepared to jump ship, the RIA Novosti news agency cited an official as saying.

It is not the first time space station crews have scrambled for shelter from accumulated space junk. Crews are routinely put on alert to prepare to move out of harm’s way.

Three crew members were forced briefly to evacuate the space station in an incident in March 2009.

The station — a $100 billion project of 16 nations under construction about 220 miles above the earth since 1998 — is currently manned by three Russians, two Americans and a Japanese astronaut.

Only 10 percent of all objects in Earth’s orbit are satellites, while the rest is trash: spent rocket stages, defunct satellites, acceleration blocks and other debris, a spokesman for the agency told state news agency Itar-tass.

Even small objects present a danger to astronauts in orbit, where trash the size of an egg can travel at dangerous speeds.

The minefield of space debris is a growing hazard with ever more satellites in orbit, and one of the most important challenges of future orbital ventures, industry expert Vladimir Gubarev told Reuters.

“Everything is spaced out just some 100 meters from each other. One satellite gets in the way of the next. It’s way too crowded,” said Gubarev, a renown space journalist and the Soviet spokesman for the joint Apollo-Soyuz mission in 1975.

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Space Debris and Human Spacecraft

 

More than 500,000 pieces of debris, or “space junk,” are tracked as they orbit the Earth. They all travel at speeds up to 17,500 mph, fast enough for a relatively small piece of orbital debris to damage a satellite or a spacecraft.

The rising population of space debris increases the potential danger to all space vehicles, but especially to the International Space Station, space shuttles and other spacecraft with humans aboard.

NASA takes the threat of collisions with space debris seriously and has a long-standing set of guidelines on how to deal with each potential collision threat. These guidelines, part of a larger body of decision-making aids known as flight rules, specify when the expected proximity of a piece of debris increases the probability of a collision enough that evasive action or other precautions to ensure the safety of the crew are needed.

Orbital Debris

Space debris encompasses both natural (meteoroid) and artificial (man-made) particles. Meteoroids are in orbit about the sun, while most artificial debris is in orbit about the Earth. Hence, the latter is more commonly referred to as orbital debris.

Orbital debris is any man-made object in orbit about the Earth which no longer serves a useful function. Such debris includes nonfunctional spacecraft, abandoned launch vehicle stages, mission-related debris and fragmentation debris.

There are more than 20,000 pieces of debris larger than a softball orbiting the Earth. They travel at speeds up to 17,500 mph, fast enough for a relatively small piece of orbital debris to damage a satellite or a spacecraft. There are 500,000 pieces of debris the size of a marble or larger. There are many millions of pieces of debris that are so small they can’t be tracked.

Even tiny paint flecks can damage a spacecraft when traveling at these velocities. In fact a number of space shuttle windows have been replaced because of damage caused by material that was analyzed and shown to be paint flecks.

“The greatest risk to space missions comes from non-trackable debris,” said Nicholas Johnson, NASA chief scientist for orbital debris.

With so much orbital debris, there have been surprisingly few disastrous collisions.

In 1996, a French satellite was hit and damaged by debris from a French rocket that had exploded a decade earlier.

On Feb. 10, 2009, a defunct Russian satellite collided with and destroyed a functioning U.S. Iridium commercial satellite. The collision added more than 2,000 pieces of trackable debris to the inventory of space junk.

China’s 2007 anti-satellite test, which used a missile to destroy an old weather satellite, added more than 3,000 pieces to the debris problem.

Tracking Debris

The Department of Defense maintains a highly accurate satellite catalog on objects in Earth orbit that are larger than a softball.

NASA and the DoD cooperate and share responsibilities for characterizing the satellite (including orbital debris) environment. DoD’s Space Surveillance Network tracks discrete objects as small as 2 inches (5 centimeters) in diameter in low Earth orbit and about 1 yard (1 meter) in geosynchronous orbit. Currently, about 15,000 officially cataloged objects are still in orbit. The total number of tracked objects exceeds 21,000. Using special ground-based sensors and inspections of returned satellite surfaces, NASA statistically determines the extent of the population for objects less than 4 inches (10 centimeters) in diameter.

Collision risks are divided into three categories depending upon size of threat. For objects 4 inches (10 centimeters) and larger, conjunction assessments and collision avoidance maneuvers are effective in countering objects which can be tracked by the Space Surveillance Network. Objects smaller than this usually are too small to track and too large to shield against. Debris shields can be effective in withstanding impacts of particles smaller than half an inch (1 centimeter).

Planning for and Reacting to Debris

NASA has a set of long-standing guidelines that are used to assess whether the threat of such a close pass is sufficient to warrant evasive action or other precautions to ensure the safety of the crew.

These guidelines essentially draw an imaginary box, known as the “pizza box” because of its flat, rectangular shape, around the space vehicle. This box is about a mile deep by 30 miles across by 30 miles long (1.5 x 50 x 50 kilometers), with the vehicle in the center. When predictions indicate that the debris will pass close enough for concern and the quality of the tracking data is deemed sufficiently accurate, Mission Control centers in Houston and Moscow work together to develop a prudent course of action.

Sometimes these encounters are known well in advance and there is time to move the station slightly, known as a “debris avoidance maneuver” to keep the debris outside of the box. Other times, the tracking data isn’t precise enough to warrant such a maneuver or the close pass isn’t identified in time to make the maneuver. In those cases, the control centers may agree that the best course of action is to move the crew into the Soyuz spacecraft that are used to transport humans to and from the station. This allows enough time to isolate those spaceships from the station by closing hatches in the event of a damaging collision. The crew would be able to leave the station if the collision caused a loss of pressure in the life-supporting module or damaged critical components. The Soyuz act as lifeboats for crew members in the event of an emergency.

Mission Control also has the option of taking additional precautions, such as closing hatches between some of the station’s modules, if the likelihood of a collision is great enough.

Maneuvering Spacecraft to Avoid Orbital Debris

NASA has a set of long-standing guidelines that are used to assess whether the threat of a close approach of orbital debris to a spacecraft is sufficient to warrant evasive action or precautions to ensure the safety of the crew.

Debris avoidance maneuvers are planned when the probability of collision from a conjunction reaches limits set in the space shuttle and space station flight rules. If the probability of collision is greater than 1 in 100,000, a maneuver will be conducted if it will not result in significant impact to mission objectives. If it is greater than 1 in 10,000, a maneuver will be conducted unless it will result in additional risk to the crew.

Debris avoidance maneuvers are usually small and occur from one to several hours before the time of the conjunction. Debris avoidance maneuvers with the shuttle can be planned and executed in a matter of hours. Such maneuvers with the space station require about 30 hours to plan and execute mainly due to the need to use the station’s Russian thrusters, or the propulsion systems on one of the docked Russian or European spacecraft.

Several collision avoidance maneuvers with the shuttle and the station have been conducted during the past 10 years.

NASA implemented the conjunction assessment and collision avoidance process for human spaceflight beginning with shuttle mission STS-26 in 1988. Before launch of the first element of the International Space Station in 1998, NASA and DoD jointly developed and implemented a more sophisticated and higher fidelity conjunction assessment process for human spaceflight missions.

In 2005, NASA implemented a similar process for selected robotic assets such as the Earth Observation System satellites in low Earth orbit and Tracking and Data Relay Satellite System in geosynchronous orbit.

In 2007, NASA extended the conjunction assessment process to all NASA maneuverable satellites within low Earth orbit and within 124 miles (200 kilometers) of geosynchronous orbit.

DoD’s Joint Space Operations Center (JSpOC) is responsible for performing conjunction assessments for all designated NASA space assets in accordance with an established schedule (every eight hours for human spaceflight vehicles and daily Monday through Friday for robotic vehicles). JSpOC notifies NASA (Johnson Space Center for human spaceflight and Goddard Space Flight Center for robotic missions) of conjunctions which meet established criteria.

JSpOC tasks the Space Surveillance Network to collect additional tracking data on a threat object to improve conjunction assessment accuracy. NASA computes the probability of collision, based upon miss distance and uncertainty provided by JSpOC.

Based upon specific flight rules and detailed risk analysis, NASA decides if a collision avoidance maneuver is necessary.

If a maneuver is required, NASA provides planned post-maneuver orbital data to JSpOC for screening of near-term conjunctions. This process can be repeated if the planned new orbit puts the NASA vehicle at risk of future collision with the same or another space object.

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  • Space debris risks colliding with orbital station | Reuters 28 Jun 2011 – astronauts were forced to take refuge aboard the International Space Station’s for the threat of a collision with floating space debris, the Russian. The crew was told to take their places aboard the Soyuz spacecraft,” the vulnerable orbiting station by just 250 meters (820 feet) on
    in.reuters.com/article/…/us-russia-us-space-idINTRE75R48M20110628?…

  • Space debris risks colliding with orbital station | Reuters 28 Jun 2011 – astronauts were forced to take refuge aboard the
    in.reuters.com/article/2011/06/28/idINIndia-57971120110628

 

El campo minado de basura espacial es un peligro cada vez mayor para los satélites en órbita y constituye uno de los retos más importantes de futuras empresas orbitales.

http://www.universetoday.com/wp-content/uploads/2008/04/space-debris-3-polar-orbit.jpg

“Toda la basura está espaciada sólo a unos 100 metros de resto en resto. Un satélite se interpone en el camino del siguiente. “La ruta está saturada”, dijo Vladimir Gubarev, un periodista del espacio de renombre y el portavoz del Soviet de la articulación de la misión Apolo-Soyuz de 1975.

http://www.universetoday.com/wp-content/uploads/2008/04/space-debris-3-polar-orbit.jpg&imgrefurl=http://www.universetoday.com/13587/space-debris-illustrated-the-problem-in-pictures/&usg=

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cinabrio.over-blog.es/article-laboratorio-cientifico-marciano-a-punto-de-partir-al-planeta-rojo-77421742.html - En caché

 

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