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Izar

Pulcherrima (B component), Epsilon Boötis, 36 Boötis

Proper NamesIzar (A), Pulcherrima (B)
Bayer DesignationEpsilon Boötis
Flamsteed Number36 Boötis
HR (BSC)5506 (A), 5505 (B)
HD129989 (A), 129988 (B)
ConstellationBoötes
Right Ascension14h 44m 59s (A), 14h 44m 59s (B)
Declination+27° 4' 27" (A), +27° 4' 30" (B)
Distance236 light years
72 parsecs
MagnitudeApparent: +2.50
Absolute: -1.80
Spectral ClassK0-II-III orange bright giant (A)
A0V white main sequence star (B)
Optimum VisibilityMay
NotesEpsion Boötis is a binary system, with the main component (named Izar) being an orange giant some 44 times the diameter of the Sun in the later stages of its life. This giant is orbited by a white main sequence star (Epsilon Boötis B or Pulcherrima) at a distance of some 185 AU from the primary (or more than six times this distance of Neptune from the Sun).

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