Triton (English spelling)

Japanese: トリトン（英語表記）Triton

In Greek mythology, he is the son of Poseidon, the god of the sea. He has the upper body of a human and the lower body of a fish or snake.
Neptune's first moon. Discovered in 1846. Named after. The largest in the Neptunian system. Because it revolves in the opposite direction to Neptune's rotation, its orbital speed and orbit are slowing down due to tidal forces, and it is thought that it will collide with Neptune in the future. Volcanic activity is observed on the surface, and liquid nitrogen and liquid methane are spewing out. Its diameter is about 2,700 km (about 0.2 times that of the Earth). The average surface temperature is minus 235 degrees Celsius.

Triton②/NASA/Photo: NASA https://goo.gl/6CpRpk ">

Triton

The nucleus of tritium, an isotope of hydrogen, consists of one proton and two neutrons.

Source: About Shogakukan Digital Daijisen Information | Legend

Japanese:

ギリシャ神話で、海神ポセイドンの息子。上半身は人間、下半身は魚形または蛇形の姿をとる。
海王星の第1衛星。1846年に発見。名はに由来。海王星系で最大。海王星の自転と逆向きに公転するため、潮汐力で公転速度と軌道が低下しつつあり、将来は海王星に衝突すると思われる。表面では火山活動がみられ、液体窒素・液体メタンなどを噴出している。直径は約2700キロ（地球のおよそ0.2倍）。平均表面温度はセ氏マイナス235度。

トリトン②／NASA／撮影・NASA https://goo.gl/6CpRpk">