JAPAN - Tuesday's last-minute cancellation of the first launch of the new Epsilon solid-fuel rocket was due to a computer glitch at the ground control centre, in which an error was mistakenly identified in the rocket's positioning.
On Tuesday evening, Japan Aerospace Exploration Agency President Naoki Okumura apologised for the glitch at the Uchinoura Space Center in Kimotsuki, Kagoshima Prefecture, where the rocket was scheduled to blast off at 1:45 p.m
"I regret that JAXA failed to launch the rocket as scheduled, bringing disappointment to the nation and organisations involved," Okumura said.
According to JAXA, it made a final decision to launch the rocket at 1:15 p.m. Tuesday, as it found no problems in terms of preparation and weather conditions. The automated launch system was activated 70 seconds before the planned launch, and necessary processes were started. However, the system automatically shut down 19 seconds before launch.
According to JAXA project manager Yasuhiro Morita, the fourth-stage engine in the upper part of the Epsilon that is used to put a satellite in orbit, is equipped with a sensor that detects positioning errors.
The rocket's computer system starts calculating the rocket's position based on data collected by the sensor 20 seconds before a launch. The results are then sent to a computer system at the ground control centre, which judges whether the rocket is positioned correctly.
On Tuesday, the calculation started 20 seconds before the launch, as scheduled, but the ground control computer determined the rocket was incorrectly positioned one second later based on data sent from the rocket's computer. An incorrectly positioned rocket cannot maintain a planned flight path.
However, JAXA said its remote monitoring system did not detect a positioning error.