Table 1: JHK hotometry of Sirius-B.
Band Jan. 2000 Jan. 2001 Mean Abs. Mag.(*)

J (1.215 $\mu$ m) $\rm 9.11^{+0.08}_{-0.06}$ $\rm 9.17^{+0.16}_{-0.13}$ $\rm 9.14^{+0.12}_{-0.09}$ $\rm 12.03^{+0.12}_{-0.09}$

H (1.654 $\mu$ m) $\rm 9.34^{+0.36}_{-0.24}$ $\rm 9.02^{+0.14}_{-0.09}$ $\rm 9.17^{+0.23}_{-0.16}$ $\rm 12.06^{+0.23}_{-0.16}$

$K_{\rm s}$ (2.157 $\mu$ m) $\rm 9.12^{+0.29}_{-0.23}$ $\rm 8.91^{+0.09}_{-0.07}$ $\rm 9.01^{+0.18}_{-0.14}$ $\rm 11.90^{+0.18}_{-0.14}$

**Table 1:** *JHK* hotometry of Sirius-B.
Band	Jan. 2000	Jan. 2001	Mean	Abs. Mag.(*)
J (1.215 $\mu$ m)	$\rm 9.11^{+0.08}_{-0.06}$	$\rm 9.17^{+0.16}_{-0.13}$	$\rm 9.14^{+0.12}_{-0.09}$	$\rm 12.03^{+0.12}_{-0.09}$
H (1.654 $\mu$ m)	$\rm 9.34^{+0.36}_{-0.24}$	$\rm 9.02^{+0.14}_{-0.09}$	$\rm 9.17^{+0.23}_{-0.16}$	$\rm 12.06^{+0.23}_{-0.16}$
$K_{\rm s}$ (2.157 $\mu$ m)	$\rm 9.12^{+0.29}_{-0.23}$	$\rm 8.91^{+0.09}_{-0.07}$	$\rm 9.01^{+0.18}_{-0.14}$	$\rm 11.90^{+0.18}_{-0.14}$

(*) using the Hipparcos parallax $\pi=0.3791$ $^{\prime \prime }$ .

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