Madrigal

Madrigal was a UNSC colony world. It was the closest world to Harvest in 2525. The colony was glassed by the Covenant

Behind the Scenes
The closest candidate for Madrigal's star would be Lacaille 8760. However, this star has never been shown to have orbiting planets.

Madrigal was a city in Bungie's Myth series, as well in the Siege of Madrigal, a music piece from Marathon, and as such is a nod to two separate Bungie-made series.