Star
Rasalhague
White star · A5III
α Ophiuchi · Ophiuchus
Shown in its true colour — like most stars, it is too far away to photograph as more than a point of light.
Alpha Ophiuchi, also named Rasalhague, is a binary star and the brightest star in the constellation of Ophiuchus. Five degrees west-north-west of Rasalhague lies Rasalgethi, one of the brightest stars in the nearby constellation Hercules.
Description from Wikipedia (CC BY-SA 4.0).
In your sky
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Key facts
Distance
~48.6 light-years
Apparent mag.
+2.08
Spectral type
A5III
Luminosity
28.4 × Sun
Absolute mag.
+1.22
Catalogue
HIP 86032
Spectral type
A5III
True colour from its B–V index (0.15): a surface around 8600 K.
Did you know
- Rasalhague is also known as α Ophiuchi.
- Its spectral type A5III marks it as a white star.
- It lies in the constellation Ophiuchus.
