Table 4: Apparent and absolute magnitudes of Altair, using the Hipparcos parallax ( $\pi = 194.45 \pm 0.94$ mas).
U B V R I J H K L

$m_\lambda$ 1.07 0.99 0.77 0.62 0.48 0.327 0.228 0.205 0.20

$\sigma(m_\lambda)$ 0.05 0.01 0.01 0.05 0.05 0.009 0.008 0.005 0.01

$M_\lambda$ 2.51 2.43 2.21 2.06 1.92 1.77 1.67 1.65 1.64

**Table 4:** Apparent and absolute magnitudes of Altair, using the Hipparcos parallax ( $\pi = 194.45 \pm 0.94$ mas).
	U	B	V	R	I	J	H	K	L
$m_\lambda$	1.07	0.99	0.77	0.62	0.48	0.327	0.228	0.205	0.20
$\sigma(m_\lambda)$	0.05	0.01	0.01	0.05	0.05	0.009	0.008	0.005	0.01
$M_\lambda$	2.51	2.43	2.21	2.06	1.92	1.77	1.67	1.65	1.64

Source LaTeX | All tables | In the text

	1 Introduction
	2 Interferometric observations
	3 Modeling Altair
	4 Results from the $\chi ^2$ analysis
	5 Discussion
	6 Summary and conclusions
	References