Planet 2007 OR10 was discovered on July 17, 2007, during a search for distant bodies in a region of space known as the Kuiper Belt. Now, the three astronomers who discovered it want the help of society to name it and remove the identifier 2007OR10, the name by which it is now known.
2007 OR10 is ~ 1250 km in diameter. That makes it smaller than Pluto and Eris and some of the other Pluto-sized KBOs, but that size estimate earns 2007 OR10 a spot on the list of the top 10 largest KBOs. 2007 OR10 is likely large enough for gravity to make it round, making it a candidate dwarf planet.
Meg Schwamb, Mike Brown and David Rabinowitz were the astronomers in charge of launching a campaign to select a suitable name.
Thus, the International Astronomical Union (IAU) has already pre-selected the names that meet its expectations. All people have to do is vote.
The candidate names chosen have to do with mythological creatures and figures that reflect the properties of 2007 OR10. You can vote here.