Comment by LegionMammal978

Wikipedia suggests that this is the case [0]:

"However, since the universe contains the cosmic microwave background radiation, in order for the black hole to dissipate, the black hole must have a temperature greater than that of the present-day blackbody radiation of the universe of 2.7 K. A study suggests that M must be less than 0.8% of the mass of the Earth – approximately the mass of the Moon."

I'm not sure where the discrepancy between the mass of the Moon vs. an asteroid comes from, though.

[0] https://en.wikipedia.org/wiki/Hawking_radiation#Black_hole_e...