Galactic AdmiralTarsis rates an "Admiral's barge," his being a full destroyer class vessel. This is due to the disinformation campaign of Galactic Military Intelligence, misleading potential enemy to believe the Admiral moves from his Fleet to the rear in a mere yacht class vessel as other Admirals do.

Spaceship-warp-Dreamstime.No.67910390.(c).Luca Oleastri

Also in the interest of disinformation, the attached image, reputedly of Senintel, is merely a representative holopic of a similar sized vessel.