Neptune waxay leedahay shan giraan oo kala duwan oo loo magacaabay, si ay u kordhiyaan masaafada ka jirta meeraha, Galle, Le Verrier, Lassell, Arago iyo Adams. Marka lagu daro giraanadaas si fiican loo qeexay, Neptune sidoo kale waxaa laga yaabaa inuu leeyahay xaashi aad u khafiif ah oo wax ka soo gala Le Verrier ilaa giraanta Galle, oo laga yaabo inay ka sii fogaato dhinaca meeraha. Saddex ka mid ah giraanada Neptunian waa cidhiidhi, oo ballaadhkoodu yahay qiyaastii 100 km ama ka yar; taas bedelkeeda, giraanada Galle iyo Lassell waa balaadhan yihiin<unk>ballaadhkoodu waa inta u dhexeysa 2,000 iyo 5,000 km.
giraanada Jupiter