d Serpentis is a ternarystar system. At its heart is a binary pair in close orbit around one another, with a third star pursuing a more distant path around the central pair. The central binary consists of a yellowgiant and a whitemain sequence star in an extremely close orbit, while the third more distant companion is a yellow-orangegiant. The entire system shows irregular changes in brightness due to eruptive activity, perhaps due to interactions between the two close central stars of the system.