Gemenon Traveler was a bulk cargo vessel which escaped the Fall of the Twelve Colonies as part of the Fleet.
The Cylon infiltrator Leoben Conoy was found hiding aboard. After interrogation by Lieutenant Kara "Starbuck" Thrace, Conoy is ejected into space from the Gemenon Traveler's airlock on the order of President Laura Roslin.
The Gemenon Traveler was mentioned in the finale of Season 2. Its fate since then is unknown as it hasn't been seen since the New Caprica colonization. A ship of apparently identical design is seen early during "Taking a Break from all your worries".