Constellation:

Character:

Portgas D. Ace , renamed to "Portgaz D. Trace" in the 4Kids dub), nicknamed "Fire Fist Ace" , "Trace Heat Fist" in the 4Kids dub), is Luffy's older brother and the commander of the second division of Whitebeard's pirates. Though it is implied at first that his father is Monkey D. Dragon, his actual father is Gol D. Roger.Rejecting his biological male parent, he only recognizes Whitebeard as his father and took the surname of his mother, because he owes her a great debt. To conceal his existence from the World Government, Portgas D. Rouge carried him for twenty months before giving birth. 

Source from Wikipeida