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How small until unseen?

RuBisCO

By RuBisCO
in Science & Spaceflight

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RuBisCO

RuBisCO

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How small would a capture asteroid need to be to NOT be visible to the naked eye? Lets assume it is never any closer then 150,000 km to the earth and it has an albedo of 0.06 (it is black).

Using the moon's apparent magnitude as a estimator I get that it would need to be less then 400 m wide to have an apparent magnitude of 7 (no longer visible to the naked eye). I have no direct way of calculating apparent magnitude though.

Edited by RuBisCO
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