—use the "display all measurements" option to show additional parameters.| dec=| appmag_v=0.03 }} | metal=[LINK: M/H] [1]=−0.5 | mass=2.11| radius=2.26×2.78 | rotation=12.5 h| luminosity=37±3| temperature=9602±180| gravity=4.1±0.1 }} Vega ( or ; also known as ? Lyr / ? Lyrae / Alpha Lyrae) is the brightest star in the constellation Lyra, the fifth brightest star in the night sky and the second brightest star in the northern celestial hemisphere, after Arcturus. It is a relatively nearby star at only 25.3 light years from Earth, and, together with Arcturus and Sirius, one of the most luminous stars in the Sun's neighborhood. Vega has been extensively studied by astronomers, leading it to be t