Very Large Telescope, which resolved the pair and constrained their orbit to be a tight semi-major axis of about 16 Earth-Moon distances and an orbital period of about 12.1 days. Gliese 229Ba has a mass of about 38 and Gliese 229Bb has a mass of about 34 .

Spectral type T

The spectral type "T" was first proposed in 1999 with Gliese 229B as its only representative at the time. Next came the discovery

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