For a student project we are looking into the possibility of detecting micrometeoroid (micrometer-size) impacts on the lunar surface with cubesats equipped with a thermal imaging device. We have found sources suggesting that the temperature on impact would be around 3000K.
We are now looking at using a thermal imaging device with a Noise Equivalent Temperature difference (NEdT) of 25mK. This NEdT however is for a heat source very close to the sensor and also with a much lower temperature than what our system would try to detect. This sensitivity apparently increases when the temperature of the heat source increases. What we don't know is how this sensitivity scales and whether an IR camera with this sensitivity could detect these temperature differences.
Our cubesat will be delivered into a 500km circular orbit (orientation is yet to be chosen) but we are allowed to carry propulsion systems so the orbit can be lowered.