Tiaanamat played host to the Festival of Offerings, a millennial choral ceremony held when the planet's rings aligned.
Behind the scenes
The asteroid is not named in the series itself. The name "Tiaanamat" comes from production artwork on the BBC website. According to handwritten notes on the artwork, the asteroids in the Rings of Akhaten are composed of solidified molten magma ore fragments. Tiaanamat was built on the largest piece of ore on the outer ring as a docking point. The reference book The Doctor's Lives and Times identifies the asteroid as "Tiaanamaat" and states that Susan bought the Five Hundred Year Diary there as a present for her grandfather.