When was neptune discoverer

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Neptune is too faint to be seen with the naked eye. It was just starting its retrograde — or backward — motion through the sky as seen from Earth.

But Galileo seems to have mistook the planet for a star. Galileo Galilei may have been the first to spot the yet-to-be-discovered planet Neptune. The hunt to find it was on. It took more than 20 years, however, before the young English astronomer and mathematician John Couch Adams started working on the problem. He had little confidence in his early results, which led him to keep starting over from scratch.

But by early , Adams had calculated new possible orbits for the predicted trans-Uranian planet. Meanwhile, as Adams delayed releasing his results, French astronomer Urbain Le Verrier published his independent and slightly different calculations in June.

If Galileo took out his telescope just before dawn on the morning of Jan. Neptune was stationary relative to Jupiter on January 13, and then started moving from right to left, passing Jupiter again on Jan. Neptune would have looked to him like a star, just as it does in small telescopes today. It takes a very large telescope, and very good conditions to see anything like the view in Starry Night. Even through the largest telescope in Canada — the inch reflector at the David Dunlap Observatory north of Toronto — Neptune appears as a featureless blue disk.

You can see the opposition of Neptune on Friday night in a webcast hosted by the Slooh Community Observatory.