In order to maximize the supply of NASA materials, the US track company ATK switched to the Atlas rocket launch spacecraft.

According to foreign media reports, in order to ensure that the materials sent to the International Space Station can be maximized and delivered on time, the track ATK plans to launch the next generation Cygnus spacecraft on the Atlas V rocket instead of the original Antares rocket. Orbital ATK said that the original OA-7Cygnus mission plan was carried on the Antares rocket, launched from the island of Valeps, and plans are now changed. The OA-7Cygnus will be mounted on the Atlas V rocket of the United Launch Alliance, expected in 2017. Launched from Cape Canaveral in the spring. The company also said that this is only an individual adjustment, and the future Cygnus mission will continue to carry the Antares rocket launch.

Frank DeMauro, deputy head of the Human Space Systems Group at ATK, said that the rocket-changing change was the result of a joint effort between NASA and Orbital ATK.

Frank DeMauro, deputy head of the Human Space Systems Group at ATK, said that the rocket-changing change was the result of a joint effort between NASA and Orbital ATK. We have found that it is in NASA's interest to have the OA-7 carry more cargo and ensure that it arrives on time. The Atlas V rocket enables Cygnus to carry more than 300 kilograms of cargo, and the entire pressure chamber can hold more than 3,500 kilograms of cargo. Together with the external CubesatDeployer, the OA-7 has an overall transport capacity of 3,600 kilograms. DeMauro said that the upgraded version of the Antares rocket equipped with OA-5 Cygnus on October 17 was no problem. The replacement of the Atlas V rocket allowed the company to have more people ready for the next launch.

The extra load is required and the arrival on time is ensured because the other two cargo ships expected to be sent to the International Space Station need to be postponed. SpaceX's Dragon detector was postponed by the Falcon 9 explosion on September 1. The next Dragon mission was originally expected to be launched in November. Today's launch time will not be earlier than January, depending on the hunting time. When will Eagle 9 reinstate? The other is Japan's unmanned transport vehicle H-2 Transfer Vehicle, which was postponed due to a leak in the preparation process. The plan, originally scheduled for launch in early October, is currently rescheduled to December 9.

DeMauro said that the International Space Station Commercial Supply Service Contract (CRS) signed by the track ATK and NASA gave the company the right to change the Cygnus launching tool, but he refused to talk about whether changing the launching tool would bring additional expenses to the track ATK. Didn't talk about whether NASA will pay extra for this, he said it is the company's financial confidential information. From an operational point of view, DeMauro said that the OA-7 was almost identical to the launch missions in December 2015 and March 2016. After the failure of an Antares rocket carrying Cygnus in October 2014, the track ATK ordered these services. The company will continue to use the load handling facilities at the NASA Kennedy Space Center used in the first two missions, and the preparation process is basically the same.

After OA-7, Orbital ATK will carry Cygnus from the re-use Antares rocket until the end of the current CRS contract, which is 2018. This includes two launches in the second half of 2017 and two in 2018. The exact process of the entire program will be arranged in detail according to the needs of the International Space Station and NASA.

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