Magnitude

Magnitude is a number that defined the brightness of an astronomical object.

For an object such as a star, the amount of brightness emitted was reflected in the intensity of radiation produced. A star with a superdense corona had a higher level of magnitude, which translated into the radiation being more intense. In 2266, the comet Icarus IV was rated as magnitude seven by the sensors of the USS Enterprise (NCC-1701). 

In 2267, Gothos was rated as a a magnitude 1E planet by the sensors of the Enterprise. 

Later that year, the primary of the Gamma 7A system was rated as a fourth magnitude sun. Information on this system was stored in the library computer of the Enterprise.