@drmaddkap
1. They picked Emperor penguins which are MUCH larger than most penguins
2. 22 meters is only one dimension of the asteroid; you would need about 11,000 penguins to have the same volume
3. Asteroids are typically rock or iron, which are more dense than meat, of which penguins are made. (Comets are typically ice, which is about the same density as meat)

All these understate the size of the asteroid