How does the radius of EBLM J0555-57Ab compare to the radius of Jupiter?

Answer

It measures only about $0.84$ times the radius of Jupiter

EBLM J0555-57Ab is frequently cited as an example illustrating the minimal size for a hydrogen-burning star, existing right at the boundary between stars and substellar objects. Measurements indicate its radius is extremely close to that of Jupiter, specifically quantified as approximately $0.84$ times the radius of the largest planet. This extremely tight measurement underscores how small a star can be while still generating sufficient core pressure to fuse hydrogen. For context, Jupiter itself has a relative radius of approximately $0.10$ times the Sun's radius, whereas EBLM J0555-57Ab is slightly smaller relative to the Sun ($0.084$ times the Sun's radius), confirming its near-planetary size.

How does the radius of EBLM J0555-57Ab compare to the radius of Jupiter?

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