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Its radius, mass, effective temperature, H/He ratio and age are $R=2500\\pm100$ km, $M=1.33\\pm0.01$ $\\rm M_{\\odot}$, $T_{\\mathrm{eff}}=31200\\pm 1200$ K, ${\\mathrm{H/He}}\\sim0.1$ and $330\\pm40$ Myr, respectively. The observed spectrum is redshifted by $V_{\\mathrm{r}}=+240\\pm15$ km s$^{-1},$ which is mostly attributed to the gravitational redshift. 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