Distance versus effective temperature curves corresponding to evolutionary sequences of PG 1159 models extracted from Miller Bertolami & Althaus (2006) with different stellar masses and the apparent magnitude V corresponding to the GW Vir star (DOV-type) PG 1159−035. The location of this star is marked with a red circle with error bars. The star is characterised by T_eff = 140 000 ± 5000 K and $d_{\mathrm{BJ}}={585}_{-21}^{+20}$ pc. From linear interpolation, the astrometric mass of PG 1159−035 is $M_{\mathrm{Astr}}=0.{614}_{-0.020}^{+0.028}{M}_{\odot }$.