ATV はスペースステーションがロシアのデブリを回避するのを助ける
ATV Helps Space Station Dodge Russian Debris Europe's Automated Transfer Vehicle (ATV) fired two of its four rocket thrusters Aug. 27 to move the international space station away from the remnants of a Russian spy satellite. It was the first time in five years the space station's orbit has been altered to avoid a potentially disastrous collision at orbital velocity.
According to NASA's daily space station status report, the European-built cargo ship Jules Verne, which is docked at the station's aft end, fired its rocket engines for 5 minutes and 2 seconds, the first such station maneuver since May 30, 2003.
The offending piece of space hardware, catalogued as Object #33246, was part of a Russian satellite formerly known as Kosmos-2421.
NASA projections predicted that, without an avoidance maneuver, the space station and the debris would have come within 1.6 kilometers of each other, creating a 1-in-27 chance of a collision.
Mission requirements call for an avoidance maneuver if there's a greater than 1-in-10,000 chance that a piece of orbital debris could collide with the space station.
Kosmos-2421 was a Russian Navy electronic ocean surveillance satellite that apparently shut down and began breaking apart in March, according to NASA's Orbital Debris Program Office at Johnson Space Center in Houston.
As of June, the satellite had undergone three different fragmentation events that left a total of 500 or more bits of debris floating around an orbit 390 to 415 kilometers above Earth.
The space station typically flies in an orbit with an altitude of about 354 kilometers.
http://www.space-library.com/080910MS-s.pdf
ATV Helps Space Station Dodge Russian Debris Europe's Automated Transfer Vehicle (ATV) fired two of its four rocket thrusters Aug. 27 to move the international space station away from the remnants of a Russian spy satellite. It was the first time in five years the space station's orbit has been altered to avoid a potentially disastrous collision at orbital velocity.
According to NASA's daily space station status report, the European-built cargo ship Jules Verne, which is docked at the station's aft end, fired its rocket engines for 5 minutes and 2 seconds, the first such station maneuver since May 30, 2003.
The offending piece of space hardware, catalogued as Object #33246, was part of a Russian satellite formerly known as Kosmos-2421.
NASA projections predicted that, without an avoidance maneuver, the space station and the debris would have come within 1.6 kilometers of each other, creating a 1-in-27 chance of a collision.
Mission requirements call for an avoidance maneuver if there's a greater than 1-in-10,000 chance that a piece of orbital debris could collide with the space station.
Kosmos-2421 was a Russian Navy electronic ocean surveillance satellite that apparently shut down and began breaking apart in March, according to NASA's Orbital Debris Program Office at Johnson Space Center in Houston.
As of June, the satellite had undergone three different fragmentation events that left a total of 500 or more bits of debris floating around an orbit 390 to 415 kilometers above Earth.
The space station typically flies in an orbit with an altitude of about 354 kilometers.
http://www.space-library.com/080910MS-s.pdf