Vega

Vega (aka Alpha Lyrae) is the brightest star in constellation Lyra. It is a relatively close star, 25 light-years from Earth, and one of the most luminous stars in the solar neighborhood, along with Arcturus and Sirius. It is very well studied: some of the first spectral measurements were done on Vega, and various standardized magnitude scales were defined so as to take Vega's magnitude as zero (these Vega-based scales now termed the Vega system). Vega's characteristics:

• Lyra - constellation.
• 18h36m56.33635s - right ascension.
• +38deg47m01.2802s - declination.
• 25.04 ly - distance.
• +0.026 - apparent magnitude.
• A0 Va - spectral type.
• +0.00 - U B color index.
• +0.00 - B-V color index.
• variable star.
• 2.135 Msun - mass.
• 2.362 Rsun - radius.
• 40.12 L_Sun - luminosity.
• 9602 K - temperature.
• -0.5 - metallicity ([Fe/H] in bracket notation).
• 20.48 km/s - rotational velocity.
• 455 Myr - age.