Table 1: Basic data on the microquasar LS I  ${+61^\circ 303}$ and the cluster IC 1805.
                LS I  ${+61^\circ 303}$             IC 1805  

l		 [$^{\circ}$] 135.68 (1) 134.73 (2)

b		 [$^{\circ}$] +1.09 (1) +0.92 (2)

$\mu_{\alpha } \cos{\delta}$		 [mas yr-1] 0.97 $\pm$ 0.26 (1) $-1.02 \pm 0.4$ (2)

$\mu_{\delta}$		 [mas yr-1] $-1.21 \pm 0.3$ (1) $-0.88 \pm 0.4$ (2)

D		 [kpc] 2.3 $\pm$ 0.4 (3, 4) 2.3 $\pm$ 0.1 (5)

$V_{\rm helio}$		 [km s-1] $-55 \pm 4$ (6) $-41.2 \pm 3$ (2)

U		 [km s-1] 37.7 $\pm$ 4.1   42.9 $\pm$ 4.4  
V [km s-1] $-37.0 \pm 4.1$   $-11.8 \pm 4.5$  
W [km s-1] $-1.8 \pm 3.4$   $-6.9 \pm 4.0$  

Lifetime/Age		 [Myr] <20   <5 (5, 7)

$M_{\rm x}$		 [$M_{\odot }$] 2 $\pm$ 1 (6, 8) -  

$M_{\rm Be}$		 [$M_{\odot }$] 14 $\pm$ 4 (6, 8) -  

Spect. type		   B0Ve (5, 6, 9) -  

Bin. eccentr.		   0.7 $\pm$ 0.1 (8, 12) -  

Binary mean sep.		 [${R}_\odot$] 46 (10) -  

Binary period		 [days] 26.5 (10, 11) -  
Note: (1) Lestrade et al. (1999); (2) Dambis et al. (2001); (3) Frail & Hjellming (1991); (4) Steele et al. (1998); (5) Massey et al. (1995); (6) Hutchings & Crampton (1981); (7) Dennison et al. (1997); (8) Martí & Paredes (1995); (9) Paredes & Figueras (1986); (10) Taylor et al. (1992); (11) Gregory (2002); (12) Casares et al. (2004).

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