55P/Tempel–Tuttle (commonly known as Comet Tempel–Tuttle) is a periodic comet with an orbital period of 33 years. It fits the classical definition of a Halley-type comet with a period of between 20 and 200 years. It was independently discovered by Wilhelm Tempel on December 19, 1865, and by Horace Parnell Tuttle on January 6, 1866. In February, 2016, two bolides detected by the NASA All-Sky Fireball Network were calculated to have orbits consistent with those of 55P, although with a node 100 degrees less than 55P. The reason for this is yet to be determined.