Derek Richardson
March 10th, 2017
Cygnus OA-7 / S.S. John Glenn. Photo Credit: Michael Howard / SpaceFlight Insider
CAPE CANAVERAL, Fla. The launch of Orbital ATKs S.S. John Glenn OA-7 Cygnus spacecraft has been postponed by two days to March 21, 2017, due to a technical issue discovered on the United Launch Alliance (ULA) Atlas V set to send the freighter toward the International Space Station (ISS).
According to ULA, a booster hydraulic issue was discovered during pre-launch testing. The additional time will allow engineers to replace a component and continue with mission preparations.
While an exact liftoff time has not be specified, opportunities for ISSmissions typically shift about 20 minutes earlier for each day postponed. The mission was originally targeting the beginning of a 30-minute window that opened at 10:56 p.m. EDT March 19 (02:56 GMT March 20) from Space Launch Complex 41.
S.S. John Glenn is poised to send some 7,700 pounds (3,500 kilograms) of supplies and experiments to the orbiting laboratory. Once in orbit, it will take about three days for the craft to rendezvous with the ISS before being captured by the stations robotic Canadarm2.
Cygnus will spend about 90 days attached to the Earth-facing port of the Unity module. Afterward, it will be unberthed to spend about a week at a safe distance from the outpost in order to perform a remote fire experiment called Saffire-III.
After the experiment is performed, the results will be downloaded via telemetry before the spacecraft is deorbited to safely burn up in the atmosphere over the Pacific Ocean.
Tagged: Cape Canaveral Air Force Station Cygnus International Space Station Lead Stories OA-7 Orbital ATK Space Launch Complex 41 United Launch Alliance
Derek Richardson is a student studying mass media with an emphasis in contemporary journalism at Washburn University in Topeka, Kansas. He is currently the managing editor of the student run newspaper, the Washburn Review. He also writes a blog, called Orbital Velocity, about the space station. His passion for space ignited when he watched space shuttle Discovery leap to space on Oct. 29, 1998. He saw his first in-person launch on July 8, 2011 when the space shuttle launched for the final time. Today, this fervor has accelerated toward orbit and shows no signs of slowing down. After dabbling in math and engineering courses in college, he soon realized that his true calling was communicating to others about space exploration and spreading that passion.
Excerpt from:
Atlas V technical issue delays OA-7 Cygnus flight to NET March 21 - SpaceFlight Insider
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