Astronomical Mythology

This week I’m starting on a new series on the Mythology surrounding the figures the different things in our Solar System (and maybe out of it) are named for. We’ll start off with how they get their names.

Everyone knows the names of the 8 (formerly 9) planets in our Solar System. Most of us even know where their names come from, Greek and Roman mythology. But what about all the other bodies in the solar system?

Turns out there are pretty specific rules that govern what a discoverer can call something, based on what sort of thing it is. For example, the moons of Uranus must all be named after Shakespeare characters while the moons of Jupiter must be named after Zeus/Jupiter’s lovers or children.

The four Gallilean moons of Jupiter, Io, Europa, Ganymede, and Callisto. (Wikimedia)

Some bodies, such as the first four of Jupiter’s moons back in the 1600s, were named by the people who discovered them. When the formal naming process was created, these names were confirmed and others were made to follow in their mold. Others held a scientific notation, such as Jupiter VI, until the official rules were created.

But who decides what these rules are?

In the 1970s, the International Astronomical Union put together a taskforce to deal with what things should be called and now decides on the “unambiguous astronomical nomenclature” (read How Space Things Are Named So No One Confuses Them with Something Else) that results in the names used for various types of astronomical objects. The IAU is an organization of thousands of astronomers and other cosmologists from around the world that get together every year to decide on important issues in astronomy. They’re the ones who decided that Pluto was a Dwarf Planet back in 2006.

Astronomers, professional or amateurs, must submit their discovery and proposed name to the IAU for scrutiny before it becomes official. They make sure that the name is not already taken and that it accords with the rules for whatever has been discovered.

Curious what all of the rules are? Check out the International Astronomical Union’s website.