Planets, Pluto and Plutons

International Astronomical Union The International Astronomers Union is currently in the process of defining planets in such a manner as to make future determinations of bodies orbiting the sun simpler.

see also Synodic Cycles,

Pluto remains a planet, and has two moons in addition to Charon.

see Pluto and Roman Calendrics, Pluto’s Moons, & Two-by-Two.

There may be a total of 12 planets if the current working definition is adopted. From closest to the Sun to furthest:

Mercury – Venus – Earth – Mars – Ceres (previously planet, then asteroid, now???)

Jupiter – Saturn – Uranus – Neptune – Pluto – Charon –  “Xena” 2003 UB313

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