= Solution
\b[TODO: the plotted location of Procyon B is missing from the damaged source diagram.] The <Stefan–Boltzmann law> would determine the <stellar radius> from its <effective temperature> and <bolometric luminosity>:
$$
\boxed{\frac{R_B}{R_\odot}=\left(\frac{L_B}{L_\odot}\right)^{1/2}\left(\frac{T_\odot}{T_B}\right)^2.}
$$
A visual <luminosity> alone must first be converted with the appropriate <bolometric correction>. <Procyon B> is a <white dwarf>, so its small <stellar radius> and hot surface place it below the <main sequence>, rather than among <giant stars> or <supergiants>. This classification does not supply the missing numerical coordinates. A source-based numerical <stellar radius> cannot be claimed from the surviving image.<Hubble Space Telescope Astrometry of the Procyon System>[Abstract: the companion Procyon B is identified as a DQZ white dwarf]{ref}
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