<Tr> <Th> Adjectives </Th> <Td> Tritonian </Td> </Tr> <Tr> <Th_colspan="2"> Orbital characteristics </Th> </Tr> <Tr> <Th> Semi-major axis </Th> <Td> 7008354759000000000 ♠ 354 759 km </Td> </Tr> <Tr> <Th> Eccentricity </Th> <Td> 6995160000000000000 ♠ 0.000 016 </Td> </Tr>

Large roughly circular dark and young regions on the moon are called