[MPSimmons]

The comment you replied to almost definitely relied on the data in the "Geology of Ceres" wikipedia entry[1]. This is from 1991, and was strictly an estimate.

The Dawn probe in 2017[2] got a better measurement, of 110K-155K.

1 - https://en.wikipedia.org/wiki/Geology_of_Ceres 2 - https://sites.nationalacademies.org/cs/groups/ssbsite/docume...