He pleaded guilty on Monday, May 17 in federal court in Manhattan to seizing the ship. Attorneys said that they would no longer slap any charges on him.
According to sentencing guidelines, Muse could have faced between 27 years and 33 years, nine months in prison.
The pirate's attorney remarked the sentence as 'reasonable'.
The man was captured by the US Navy after a hard operation on the high seas, 2009.