Fire Trap

The Halvinor tribe of Sycorax used a barren asteroid named Fire Trap from the JX82 system as their space ship. (PROSE: ) It arrived in Earth's atmosphere on Christmas Day 2006, where the Sycorax attempted to scavenge Earth, but after their leader was defeated in combat by the newly-regenerated Tenth Doctor, the Sycorax fled in their ship, but it was destroyed by Torchwood on the command order of Prime Minister Harriet Jones with a laser taken from scavenged alien technology. (TV:, etc.)

Nature
The Fire Trap was an asteroid that had been hollowed out by the Sycorax. It contained their Great Hall, which, despite its primitive appearance, contained various pieces of technology, such as a teleporter. The Great Hall was used for tribal meetings, and the hole in the roof was used to allow both lunar and solar light to enter the hall for their ancient rituals. The ship was also fitted with an All Speed Inter-System Type K engine. (PROSE: )

History
"Many centuries" prior to the 21st century, the asteroid collided with an an alien ship, and the Halvinor tribe salvaged the ship's All Speed Inter-System Type K engine to use to power their asteroid. They also hollowed out the asteroid to create the Great Hall around this time. (PROSE: )

On Christmas Day 2006, the Sycorax came to Earth in the spaceship. It was later destroyed by Torchwood on the command order of Prime Minister Harriet Jones with a laser taken from scavenged alien technology. The Tenth Doctor immediately chastised her for this immoral act, seeing it as murder. When Harriet disagreed with the Doctor, calling it an act done to protect humanity from further attack, he brought down her government with a subtle push that snowballed into her removal from power. (TV: ) After the destruction of the spaceship, UNIT officers were given a directive from the PM's office that the ship blew up of its own accord, despite that not being the case. (PROSE: )

Behind the scenes

 * The asteroid was never named on television, however both in The Time Traveller's Almanac and The Visual Dictionary, it was named as "Fire Trap"; the latter book also added various details like the backstory of the ship.