Calculated on the basis of other parameters. It approached Charon to within 27,000 km (17,000 mi) in 2015. Charon, also known as (134340) Pluto I, is the largest of the five known natural satellites of the dwarf planet Pluto.It has a mean radius of 606 km (377 mi). These tholins were produced from methane, nitrogen and related gases released from the atmosphere of Pluto and transferred over 19,000 km (12,000 mi) to the orbiting moon.[18]. Charon is the sixth-largest trans-Neptunian object after Pluto, Eris, Haumea, Makemake and Gonggong. Its gravitational influence is such that the barycenter of the Plutonian system lies outside Pluto. The practice of following the classical pronunciation established for the mythological ferryman Charon, with a "k" sound, is used by major English-language dictionaries, such as the Merriam-Webster and Oxford English dictionaries. Kristen Erickson Chasms, impact craters, and the dark north pole can be seen in this image. While Charon is not the only 'moon' of Pluto (since 1978, a total of five have been discovered), it is still the largest and most known of this group. They orbit around their centre of gravity, and Charon always faces the same hemisphere of Pluto. Charon – night-side as viewed by New Horizons(July 17, 2015). In July 2015, we saw Pluto up close for the first time and—after three years of intense study—the surprises keep coming. Roman poets and other literary sources call the river Styx. [11], Charon and Pluto orbit each other every 6.387 days.

[34], Unlike Pluto's surface, which is composed of nitrogen and methane ices, Charon's surface appears to be dominated by the less volatile water ice. NASA has taken the next steps toward building Space Launch System (SLS) solid rocket boosters for as many as six additional flights. The IAU officially adopted the name in late 1985 and it was announced on January 3, 1986. It is the only spacecraft to date to have visited and studied Charon. NASA's Lunar Flashlight, a briefcase-sized satellite, or CubeSat, will detect surface ice believed to be at the bottom of craters on the Moon that have never been exposed to sunlight. Marking the anniversary of New Horizons' historic flight through the Pluto system on July 14, 2015, mission scientists have released the most accurate natural color images of Pluto and Charon. NASA's New Horizons captured this high-resolution enhanced color view of Charon just before closest approach on July 14, 2015. Charon, largest moon of the dwarf planet Pluto. The distance between them is 19,640 km (12,200 miles). The images were put together in an animation. The little moon is so big that Pluto and Charon are sometimes referred to as a double dwarf planet system. The image reveals a mountain rising out of a depression. In July 2015, the New Horizons spacecraft made its closest approach to the Pluto system.

At half the size of Pluto, Charon is the largest of Pluto's moons and the largest known satellite relative to its parent body.

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