Ah, Ixion- The Love-Stealer. This one holds a special place in my heart, as we share a birthday, and is rather prolific in my chart.
The Astronomy: Ixion is a Plutino, with a very similar orbital period to Pluto, only about a year shorter. He is one of the largest asteroids in the solar system, at 950 miles in diameter.
The Story: Well, this one is not a pretty story. Ixion was one of the first kings of humanity, and a son of Ares. He was in love with a woman named Dia, and was planning on marrying her. To avoid paying a dowry, he murdered his father-in-law by throwing him into furnace, committing the first murder in greek history. He wandered the earth, cursed by all who saw him, marked by his crime. After pleading with Zeus, the chief god decided to pardon Ixion.
To thank him for his graciousness, Ixion immediately tried to seduce Hera, Zeus' wife, and Queen of the Gods. Zeus created a copy of Hera out of a cloud, named Nephele, and Ixion took the bait. From their union came most of the Centaurs (the exception is Chiron, Son of Kronos), a rowdy and wild bunch, to say the least.
Why He Matters: In your chart, Ixion represents where you flout the rules, take bold steps and commits some seriously heinous deeds. Its a monstrous part of you (funny how that keeps coming up with these guys...) and not exactly easy to integrate. Every time Ixion is activated, the choices that you make will be your downfall. When you least expect it, it all comes crashing down.
To find him in your chart, hit up Astro.com, plug in your birth info and under the extended options put in asteroid 28978 (or ask your friendly neighborhood astrologer!)
Currently, Ixion is at 18 Sagittarius and in sextile to Venus and Pallas Athene, square to Psyche.