domingo, 22 de septiembre de 2013

NASA - NASA Partner Orbital Sciences Launches Demonstration Mission to Space Station

Cygnus Rendezvous Delayed 48 Hours
 
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The Antares rocket carrying the Cygnus commercial cargo craft lifts off from the Mid-Atlantic Regional Spaceport's Launch Pad-0A at NASA's Wallops Flight Facility in Virginia.
Image Credit: NASA TV
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The Antares rocket carrying the Cygnus commercial cargo craft lifts off
Cygnus is on its way to rendezvous with the space station. The spacecraft will deliver about 1,300 pounds (589 kilograms) of cargo, including food and clothing, to the Expedition 37 crew.
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Orbital Sciences has confirmed Sunday morning, around 1:30 a.m. EDT, its Cygnus spacecraft established direct data contact with the International Space Station (ISS) and found that some of the data received had values that it did not expect, causing Cygnus to reject the data. This mandated an interruption of the approach sequence. Orbital has subsequently found the causes of this discrepancy and is developing a software fix. The minimum turnaround time to resume the approach to the ISS following an interruption such as this is approximately 48 hours due to orbital mechanics of the approach trajectory.
Expedition 37 crew members aboard the space station now will have an off-duty day in advance of a busy week ahead. This includes Tuesday's Cygnus rendezvous, followed by preparations for the arrival of three new crew members Wednesday. Michael Hopkins of NASA and Oleg Kotov and Sergey Ryazanskiy of the Russian Federal Space Agency (Roscosmos) will depart from the Baikonur Cosmodrome in Kazakhstan at 4:58 p.m. EDT aboard a Soyuz spacecraft.
Cygnus launched Wednesday aboard an Antares rocket at 10:58 a.m. EDT from NASA’s Wallops Flight Facility in Virginia after a 24 hour delay due to poor weather preventing its roll-out to the launch pad.
It has several demonstration objectives it must complete before NASA approves its capture by the Canadarm2 and its berthing to the Harmony node. The Cygnus has already achieved three of its demonstration objectives during its first two days in orbit. The vehicle first demonstrated its position and control ability, or its ability to orient itself in space; second, the vehicle turned off its engines and operated while in free drift; third, Cygnus conducted a demonstration abort maneuver.
Before any new cargo craft can approach and rendezvous with the station for the first time it must meet a set of objectives to prove its capabilities before it is finally captured or docked. The resupply craft is followed closely by mission controllers on its way to the station. When the spacecraft reaches certain points along its trajectory the flight director polls mission controllers before giving the “go/no-go” decision to proceed to its next point.
As Cygnus meets its demonstration objectives and moves closer to the space station, Expedition 37 Flight Engineers Luca Parmitano and Karen Nyberg will be watching and working in tandem with Mission Control. Parmitano will be in the cupola at the Canadarm2 controls monitoring its approach. Nyberg will be his back up at the secondary robotics workstation inside the Destiny laboratory.
When Cygnus meets its final demonstration objective of pointing a tracking laser at a reflector on the Kibo laboratory it will move to its capture point about 10 meters from the station. Cygnus will turn off its thrusters, operating in free drift, and Parmitano will maneuver the Canadarm2 to grapple and capture the new resupply craft.
After capture, Parmitano will operate the Canadarm2 to move Cygnus and attach it to the Harmony node. The hatches to Cygnus are planned to be opened following leak checks and power connections.
Orbital Sciences is the second company to send a commercial cargo craft to the space station. SpaceX was the first company to send its own cargo ship with two successful commercial resupply missions and two demonstration missions under its belt.
 
NASA Partner Orbital Sciences Launches Demonstration Mission to Space Station
NASA commercial space partner Orbital Sciences Corporation of Dulles, Va., successfully launched its Cygnus cargo spacecraft aboard its Antares rocket at 10:58 a.m. EDT Wednesday from the Mid-Atlantic Regional Spaceport Pad-0A at NASA’s Wallops Flight Facility in Virginia.
This is the first time a spacecraft launched from Virginia is blazing a trail toward the International Space Station, heralding a new U.S. capability to resupply the orbiting laboratory.
Traveling 17,500 mph in Earth's orbit, Cygnus is on its way to rendezvous with the space station Sunday, Sept. 22. The spacecraft will deliver about 1,300 pounds (589 kilograms) of cargo, including food and clothing, to the Expedition 37 crew, who will grapple and attach the capsule using the station's robotic arm.
"Today marks a milestone in our new era of exploration as we expand the capability for making cargo launches to the International Space Station from American shores," said NASA Administrator Charles Bolden. "Orbital's extraordinary efforts are helping us fulfill the promise of American innovation to maintain our nation's leadership in space."
Orbital is building and testing its Antares rocket and Cygnus spacecraft under NASA’s Commercial Orbital Transportation Services (COTS) Program. The successful completion of the COTS demonstration mission will pave the way for Orbital to conduct eight planned cargo resupply flights to the space station through NASA’s $1.9 billion Commercial Resupply Services contract with the company.
Future Cygnus flights will significantly increase NASA's ability to deliver new science investigations to the only laboratory in microgravity. As one of two U.S. carriers capable of providing cargo resupply missions to the space station, a successful demonstration mission will ensure a robust national capability to deliver critical science payloads to orbit. NASA's other cargo resupply provider, Space Exploration Technologies (SpaceX), began flying regular cargo missions to the space station in 2012, following its own COTS demonstration mission.
"Today’s launch is the culmination of more than five years’ work between the NASA and Orbital teams," said Alan Lindenmoyer, NASA’s program manager for commercial crew and cargo. "Everyone involved should be extremely proud, and we are looking forward to a successful series of checkouts between now and when Cygnus reaches the space station this weekend."
Over the next several days, Cygnus will perform a series of maneuvers to test and prove its systems, ensuring it can safely enter the so-called "keep-out sphere" of the space station, a 656-foot (200-meter) radius surrounding the complex.
NASA Television coverage for grapple and berthing operations will begin at 4:30 a.m. Sept. 22 and continue through the capture and installation of the Cygnus spacecraft. Capture is scheduled for about 7:25 a.m. with installation of the spacecraft beginning around 9 a.m.
A joint news conference will take place at NASA's Johnson Space Center in Houston and at Orbital's Headquarters at 45101 Warp Drive, in Dulles, Va., at about 1 p.m. EDT, after Cygnus operations are complete. The briefing will be carried live on NASA TV and the agency's website. Media may participate by telephone by calling the Johnson newsroom at 218-483-5111 no later than 15 minutes prior to the start of the briefing. Media interested in attending the briefing in Houston should contact Johnson's newsroom no later than 5 p.m. EDT Friday, Sept. 20. Media with U.S. citizenship who want to attend the briefing at Orbital should contact Barron Beneski at 703-406-5528 or public.relations@orbital.com by noon Friday, Sept. 20. The registration deadline for non-U.S. citizens has passed.
NASA initiatives such as COTS are helping to develop a robust U.S. commercial space transportation industry with the goal of achieving safe, reliable and cost-effective transportation to and from the International Space Station and low-Earth orbit. NASA’s Commercial Crew Program also is working with commercial space partners to develop capabilities to launch U.S. astronauts from American soil in the next few years.
The International Space Station is a convergence of science, technology and human innovation that demonstrates new technologies and makes research breakthroughs not possible on Earth. The space station has had continuous human occupation since November 2000. In that time it has been visited by more than 200 people and a variety of international and commercial spacecraft. The space station remains the springboard to NASA's next great leap in exploration, including future missions to an asteroid and Mars.
For more information about the Orbital demonstration mission, visit:
For more information about the International Space Station, visit:
NASA
Guillermo Gonzalo Sánchez Achutegui

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