Only one factor.
The stars luminosity. Our suns luminosity is 1.
Than you compare the star to our sun. If the star is brighter or dimmer its habitable zone has to be further/closer.
The “habitable zone” just defines a rough area around a star where liquid water **may** exist depending on the stars brightness. It does not define if the planet has an atmosphere, a strong enough magnetic field and so on. But it helps to spot planets that we may want to take a closer look on in the future.
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