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Boötes I

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Through Galaxy, Light-year and Parsec

Lab · Class 11Galaxies & Cosmic StructureLabGalaxies Spiral Elliptical IrregularLabGalaxies And Cosmic ScaleLab · Class 6–8Stars & Constellations

Like many of the ultrafaint dwarf spheroidals, the entire galaxy appears fainter than the Rigel system (absolute magnitude –7.84). Even so, it is one of the more luminous UFDs. It is metal-poor, like other UFDs, with a mean metallicity of −2.34.

The stellar population of Boötes I is mostly very old stars. The two populations have essentially the same age, 13.4 billion and 13.3 billion years, respectively, with most of the stars being of the latter population.

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