Orbital Sciences Corporation’s Antares rocket exploded shortly after liftoff from Wallops Island, Virginia. The explosion destroyed a Cygnus freighter carrying supplies and experiments to the International Space Station.
The explosion reportedly occurred about 6 seconds after launch. There was a massive explosion and then the vehicle fell back onto the launch pad. The Antares engines were throttled up to 108 percent when the explosion occurred.
Launch officials have confirmed there were no injuries in the explosion. All personnel are safe and accounted for at this time.
The cargo manifest includes 26 Planet Labs satellites that would be launched off the space station. Planetary Resources also had its first test satellite aboard Cygnus. Thee were also a number of student experiments on the ship. NASA has the full manifest.
This mission was Orbital Sciences’ third contracted Cygnus cargo delivery flight to the International Space Station under an 8-flight contract. Two previous contracted Cygnus missions and a demonstration flight had succeeded.
This was the fifth flight of the Antares rocket. Four previous flights had been success.
Antares uses Arojet-Rocketdyne AJ-26 engines on its first stage. These are refurbished NK-33 engines originally designed for the Soviet manned lunar program in the 1970’s. There have been problems with corrosion on the 40-year old engines; one engine exploded on its test stand in May.
The rocket’s first-stage structure is built in Ukraine. Antares second stage consists of a solid-fuel rocket supplied by ATK.
My deepest sympathies to the Orbital Sciences team and all those with payloads aboard the vehicle. It’s a bad day, but these things happen in this field. This is the nature of this business.
UPDATE: Orbital and NASA officials will have a press conference at 9 p.m. EDT (6 p.m. PDT).