10P/Tempel, also known as Tempel 2, is a periodic Jupiter-family comet in the Solar System. It was discovered in 1873 and has an orbital period of 5.3 years.
The comet nucleus is estimated to be 10.6 kilometers in diameter with a low albedo of 0.022. The nucleus is dark because hydrocarbons on the surface have been converted to a dark, tarry like substance by solar ultraviolet radiation.
During the 2010 apparition the comet brightened to about apparent magnitude 8. It next comes to perihelion (closest approach to the Sun) on 14 November 2015 when it should brighten to around magnitude 11.
The most favorable apparition of 10P/Tempel 2 was in 1925 when it came within 0.35 AU (52,000,000 km; 33,000,000 mi) of Earth with an apparent magnitude of 6.5. On August 3, 2026, comet Tempel 2 is expected to have another close pass within about 0.41 AU of Earth.