 It rises around sunset and is in the sky all night. It's brightest for the year as well. Don't bother looking for it, though, unless you have a good-sized telescope. Clyde Tombaugh was using a good-sized telescope when he discovered Pluto in 1930. He'd been searching for a possible planet beyond Neptune for about a year from Lowell Observatory in Arizona. When he found it, the little world was moving through Gemini.