Table 2: Stellar and system parameters of SDSS J212531.92-010745.9, assumed (normal font) or derived from comparison with NLTE model spectra (boldface), photometric analysis (*) and nightfall simulation (italic).
Parameter PG 1159 Companion System

$T_{\rm eff}~~[\rm K]$ $\sim$ 90 000 3500 $\pm$ 150

$T_{\rm eff,irr} ~~ [\rm K]$ 8200

$\log g ~~[\rm cm/s^2]$ $\sim$ 7.6

$m ~~[M_\odot]$ 0.6 0.4 $\pm$ 0.1 1.0 $\pm$ 0.1

$r ~~[R_\odot]$ 0.1 0.4 $\pm$ 0.1

$P_{\rm orb} ~~[\rm h]$ 6.95616(33) *

$\Delta m ~~[\rm mag]$ 0.354(3) *

$a ~~[R_\odot]$ 1.85

$i ~~[^\circ]$ 70 $\pm$ 5

**Table 2:** Stellar and system parameters of SDSS J212531.92-010745.9, assumed (normal font) or derived from comparison with NLTE model spectra (boldface), photometric analysis (*) and nightfall simulation (italic).
Parameter	PG 1159	Companion	System
$T_{\rm eff}~~[\rm K]$	$\sim$ 90 000	3500 $\pm$ 150
$T_{\rm eff,irr} ~~ [\rm K]$		8200
$\log g ~~[\rm cm/s^2]$	$\sim$ 7.6
$m ~~[M_\odot]$	0.6	0.4 $\pm$ 0.1	1.0 $\pm$ 0.1
$r ~~[R_\odot]$	0.1	0.4 $\pm$ 0.1
$P_{\rm orb} ~~[\rm h]$			6.95616(33) *
$\Delta m ~~[\rm mag]$			0.354(3) *
$a ~~[R_\odot]$			1.85
$i ~~[^\circ]$			70 $\pm$ 5

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