When William Herschel discovered a new body in the solar system on 13 March 1781, Lexell computed its orbit which showed that it was a planet (later named Uranus) twice as far from the sun as Saturn, rather than a comet as had been thought at first.
William Herschel kapag natuklasan ng isang bagong katawan sa solar system on 13 Mar 1781, Lexell computed nito orbita na kung saan ay nagpakita na ito ay isang planeta (mamaya na pinangalanang Urano) ng dalawang beses bilang sa malayong mula sa Linggo bilang Saturn, kaysa sa isang kometa bilang had been isipan at una.