Table A.1: Stellar properties of HD 20782 and HD 20781.
Parameter HD 20782 HD 20781 Ref.

$\mu_{\alpha}$ (mas/yr) $348.88\pm0.50$ $349.07\pm0.78$ 1

$\mu_{\delta}$ (mas/yr) $-64.82\pm0.73$ $-67.80 \pm1.00$ 1

RV (km s^-1) $39.5\pm0.2$ $39.6 \pm 0.2$ 2

$\pi$ (mas) $27.76\pm0.88$ $27.86\pm1.23$ 1

$R_{\rm min}$ (kpc) 4.95 2

$R_{\rm max}$ (kpc) 8.16 2

ecc 0.24 2

$z_{\rm max}$ (kpc) 0.08 2

V 7.366 8.457 2

ST G3V K0V 1

${\rm Mass} (M_{\odot})$ 0.90 0.84 2

1.00 3

0.969^+0.024_-0.022 4

Age $_{\rm isoc}$ (Gyr) 13.0 2

7.1^+1.9_-4.1 3

$9.68\pm1.76$ 4

Age_HK (Gyr) 3-6 6 5, 6

References: 1. Hipparcos (ESA 1997); 2. Nordstrom et al. (2004); 3. Valenti & Fischer (2005); 4. Takeda et al. (2006); 5. Jones et al. (2006); 6. Gray et al. (2006).

**Table A.1:** Stellar properties of HD 20782 and HD 20781.
Parameter	HD 20782	HD 20781	Ref.
$\mu_{\alpha}$ (mas/yr)	$348.88\pm0.50$	$349.07\pm0.78$	1
$\mu_{\delta}$ (mas/yr)	$-64.82\pm0.73$	$-67.80 \pm1.00$	1
RV (km s^-1)	$39.5\pm0.2$	$39.6 \pm 0.2$	2
$\pi$ (mas)	$27.76\pm0.88$	$27.86\pm1.23$	1
$R_{\rm min}$ (kpc)	4.95	2
$R_{\rm max}$ (kpc)	8.16	2
ecc	0.24	2
$z_{\rm max}$ (kpc)	0.08	2
V	7.366	8.457	2
ST	G3V	K0V	1
${\rm Mass} (M_{\odot})$	0.90	0.84	2
	1.00		3
	0.969^+0.024_-0.022		4
Age $_{\rm isoc}$ (Gyr)	13.0		2
	7.1^+1.9_-4.1		3
	$9.68\pm1.76$		4
Age_HK (Gyr)	3-6	6	5, 6

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