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Rigel
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Rigel, Beta Ori
Rigel is the lower right star in the rectangle of bright stars in Orion.
Observation data
Epoch J2000.0 Equinox J2000.0
Constellation
Orion
Pronunciation
/'ra?d??l, -g?l/
Right ascension
05h 14m 32.27210s
Declination
-08° 12' 05.8981?
Apparent magnitude (V)
0.12
Characteristics
Spectral type
B8 Iae:
U-B color index
-0.66
B-V color index
-0.03
Variable type
Slightly irregular
Astrometry
Radial velocity (Rv)
20.7 km/s
Proper motion (µ)
RA: +1.31 mas/yr
Dec.: +0.50 mas/yr
Parallax (p)
3.78 ± 0.34 mas
Distance
860 ± 80 ly
(260 ± 20 pc)
Absolute magnitude (MV)
–7.84 ± 0.2
Details
Mass
24 ± 3 M?
Radius
71 R?
Luminosity (bolometric)
96,456 L?
Surface gravity (log g)
1.75 ± 0.10
Temperature
12,130 K
Metallicity
–0.06 ± 0.10 dex
Rotational velocity (v sin i)
40 km/s
Age
(8 ± 1) × 106 years
Other designations
Database references
SIMBAD
data
Computer generated image of Rigel compared to the Sun (to scale)
Rigel (ß Ori, ß Orionis, Beta Orionis) is the brightest star in the constellation Orion and the sixth brightest star in the sky, with visual magnitude 0.18. Although it has the Bayer designation "beta", it is almost always brighter than Alpha Orionis (Betelgeuse). Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.
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