Star
Izar
White star · A0
ε Boötis · Boötes
Shown in its true colour — like most stars, it is too far away to photograph as more than a point of light.
Epsilon Boötis is a binary star system in the northern constellation of Boötes. The two components have the proper names Izar and Pulcherrima respectively; both are traditional names for the system. The star system can be viewed with the unaided eye at night, but resolving the pair with a small telescope is challenging; an aperture of 76 mm (3.0 in) or greater is required. Based on parallax measurements, it is located at a distance of 236 light-years (72 pc). The system is drifting closer to the Sun with a radial velocity of −16 km/s.
Description from Wikipedia (CC BY-SA 4.0).
In your sky
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Key facts
Distance
~203 light-years
Apparent mag.
+2.35
Spectral type
A0
Luminosity
386 × Sun
Absolute mag.
−1.62
Catalogue
HIP 72105
Spectral type
A0
True colour from its B–V index (0.97): a surface around 4800 K.
Did you know
- Izar is also known as ε Boötis.
- Its spectral type A0 marks it as a white star.
- It lies in the constellation Boötes.
