Dominus Astra
The Dominus Astra is an EXCLUSIVE pet that was sold in the Exclusive Shop. It was one of the first sold and is no longer available. It is based on the Roblox Dominus Astra hat accessory.
The latest Pet Simulator X value list for Dominus Astra can be found below:

Regular
💎 73,000,000,000 (73b)

Golden
💎 Not Available

Rainbow
💎 Not Available

Dark Matter
💎 Not Available