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Rigel
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Rigel, Beta Ori
Rigel in the constellation Orion
Observation data
Epoch J2000.0 Equinox J2000.0
Constellation
Orion
A
Right ascension
05h 14m 32.27210s
Declination
-08° 12' 05.8981?
Apparent magnitude (V)
0.13 (0.05 - 0.18)
B
Right ascension
05h 14m 32.049s
Declination
-08° 12' 14.78?
Apparent magnitude (V)
6.67
Characteristics
A
Evolutionary stage
Blue supergiant
Spectral type
B8 Iae
U-B color index
-0.66
B-V color index
-0.03
Variable type
Alpha Cygni
B
Evolutionary stage
Spectroscopic binary
Spectral type
B9V + B9V
U-B color index
-0.66
B-V color index
-0.03
Variable type
Alpha Cygni
Astrometry
Radial velocity (Rv)
7001178000000000000?17.8±0.4 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)
2999208000000000000?-7.92±0.28
Orbit
Primary
Ba
Companion
Bb
Period (P)
9.860 days
Eccentricity (e)
0.1
Semi-amplitude (K1)
(primary)
25.0 km/s
Semi-amplitude (K2)
(secondary)
32.6 km/s
Details
A
Mass
7001210000000000000?21±3 M?
Radius
7001789000000000000?78.9±7.4 R?
Luminosity (bolometric)
7000120000000000000?1.20+0.25
-0.21×105 L?
Surface gravity (log g)
7000175000000000000?1.75±0.10 cgs
Temperature
7004121000000000000?12100±150 K
Metallicity
3001400000000000000?-0.06±0.10 dex
Rotational velocity (v sin i)
7001250000000000000?25±3 km/s
Age
7000800000000000000?8±1 Myr
Ba
Mass
3.84 M?
Bb
Mass
2.94 M?
Other designations
Database references
SIMBAD
data
Rigel, also known by its Bayer designation Beta Orionis (ß Ori, ß Orionis), is the brightest star in the constellation Orion and the seventh brightest star in the night sky, with visual magnitude 0.13. The star as seen from Earth is actually a triple or quadruple star system, with the primary star (Rigel A) a blue-white supergiant that is estimated to be anywhere from 120,000 to 279,000 times as luminous as the Sun, depending on method used to calculate its properties. It has exhausted its core hydrogen and swollen out to between 79 and 115 times the Sun's radius. It pulsates quasi-periodically and is classified as an Alpha Cygni variable. A companion, Rigel B, is 500 times fainter than the supergiant Rigel A and visible only with a telescope. Rigel B is itself a spectroscopic binary system, consisting of two main sequence blue-white stars of spectral type B9V that are estimated to be respectively 3.9 and 2.9 times as massive as the Sun. Rigel B also appears to have a very close visual companion Rigel C of almost identical appearance.
^ a b c d e Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
^ Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237: 0. Bibcode:2002yCat.2237....0D.
^ Guinan, E. F.; Eaton, J. A.; Wasatonic, R.; Stewart, H.; Engle, S. G.; McCook, G. P. (2010). "Times-Series Photometry & Spectroscopy of the Bright Blue Supergiant Rigel: Probing the Atmosphere and Interior of a SN II Progenitor". Proceedings of the International Astronomical Union 5: 359. Bibcode:2010HiA....15..359G. doi:10.1017/S1743921310009798.
^ a b DENIS Consortium (2005). "VizieR Online Data Catalog: The DENIS database (DENIS Consortium, 2005)". VizieR On-line Data Catalog: B/denis. Originally published in: 2005yCat.2263....0T 1. Bibcode:2005yCat....102002D.
^ a b Sanford, Roscoe F. (1942). "The Spectrographic Orbit of the Companion to Rigel". Astrophysical Journal 95: 421. Bibcode:1942ApJ....95..421S. doi:10.1086/144412.
^ a b c d Cite error: The named reference apj2012_747_108 was invoked but never defined (see the help page).
^ a b c d Cite error: The named reference aass34_1 was invoked but never defined (see the help page).
^ a b Cite error: The named reference apj2012_749_74 was invoked but never defined (see the help page).
^ a b c Tokovinin, A. A. (1997). "MSC - a catalogue of physical multiple stars". A & A Supplement series 124: 75. Bibcode:1997A&AS..124...75T. doi:10.1051/aas:1997181.
^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
^ a b c d Przybilla, N. (2010). "Mixing of CNO-cycled matter in massive stars". Astronomy and Astrophysics 517: A38. arXiv:1005.2278. Bibcode:2010A&A...517A..38P. doi:10.1051/0004-6361/201014164.
^ a b Cite error: The named reference aaa445_3_1099 was invoked but never defined (see the help page).
^ Cite error: The named reference simbad was invoked but never defined (see the help page).
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