SI or reg units please otherwise it makes no sense.
Yes, I read "4400...half as hot as the Sun" and simply thought "that's wrong". Then I went back...
Do American astronomers have all their instruments specially calibrated to read degrees F? Somehow I doubt it, and suspect somebody actually converted that from either C or K.
Perhaps for completeness we should have degrees Réaumur as well. And Galilean air thermometer units.