📅 10 October 1846
William Lassell detected Neptune's largest moon seventeen days after the planet's discovery.
📅 10 October 1846
The discovery showed that the newly identified planet has a moon.
📅 10 October 1846
Lassell's telescope revealed a faint moving companion near the planet.
📅 10 October 1846
Triton became the first known object orbiting Neptune.
