Celebrity Constellation [SEP] vessel class
Celebrity Constellation
GTS "Celebrity Constellation is a "Millennium"-class cruise ship of Celebrity Cruises. She was originally named Constellation", but renamed in May 2007. Her three sister ships are the "Celebrity Infinity", "Summit", and "Millennium".
She was built at the Chantiers de l'Atlantique shipyard in St. Nazaire, France. The ship is powered by a COGAS power plant of gas turbines and a steam turbine providing up to 60 megawatts for the electric systems and two 19 MW Rolls-Royce/Alstom
Marella Explorer 2
Marella Explorer 2, formerly Celebrity Century & SkySea Golden Era, was the lead ship of the "Century"-class of cruise ships for Celebrity Cruises, and the co-flagship of the Celebrity fleet, along with "Millennium"-class ship "Celebrity Constellation", and the newest "Solstice"-class, "Celebrity Reflection". Other ships belonging to the "Century"-class include "Marella Explorer" (formerly "Celebrity Galaxy") and "Mein Schiff 2" (formerly "Celebrity Mercury"). 
In March 2018,