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Betelgeuse has a spectral type of M2lab signifying that it is a red class M star. the "lab" refers to it being an intermediate luminous supergiant.

It has a luminosity of 140,000L.

Referring to the H-R diagram [See related link] we can see that an M class star with a luminosity of 140,000 will appear in the very top right corner - above la supergiants.

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