There is a 10 minute launch window.

Live coverage on NASA TV will begin at 5:30 p.m. EDT. The launch of the spacecraft was scheduled for Nov. 15 but delayed two consecutive days by weather conditions at the launch site. The next launch attempt for Orbital Sciences’ Antares rocket carrying its Cygnus cargo spacecraft is scheduled for 6:22 p.m. EDT Tuesday, Oct. 28 from the Mid-Atlantic Regional Spaceport Pad 0A at NASA’s Wallops Flight Facility in Virginia. Today (April 17) at 4:46 p.m. EDT, an Antares rocket will launch a Cygnus spacecraft to the International Space Station from NASA's Wallops Flight Facility in Virginia.

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The Cygnus spacecraft is a single-use American automated cargo spacecraft developed by Orbital Sciences and now built and launched by Northrop Grumman as part of NASA's Commercial Orbital Transportation Services (COTS) developmental program. Cygnus CRS Orb-3, also known as Orbital Sciences CRS Flight 3 or Orbital 3, was an attempted flight of Cygnus, an automated cargo spacecraft developed by United States-based company Orbital Sciences, on 28 October 2014.The mission was intended to launch at 6:22 PM that evening.