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Albireo
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Albireo A
Albireo's position, lower right corner.
The cross-like figure is the Northern Cross.
The blue line shows the boundaries of the constellation the Swan.
Observation data
Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation
Cygnus
Right ascension
19h 30m
19h 30m
43.281s
43.302s
Declination
+27° 57'
+27° 57'
34.85?
34.61?
Apparent magnitude (V)
3.18
5.82
Characteristics
Spectral type
K3III
B8:pV
V-R color index
0.92
0.09
Astrometry
Proper motion:
RA (µa cos d)
-7.09 mas/yr
5.04 mas/yr
Dec. (µd)
-5.63 mas/yr
6.48 mas/yr
Parallax (p)
7.17 ± 0.33 mas
Distance
450 ± 20 ly
(139 ± 6 pc)
Absolute magnitude (MV)
-2.45
-0.25
Details
Mass
5 M?
3.2 M?
Radius
70 R?
3.5 R?
Luminosity (bolometric)
1,200 L?
230 L?
Temperature
4,080±10 K
~12,000 K
Orbit
Period (P)
213.859 yr
Semimajor axis (a)
0.536?
Eccentricity (e)
0.256
Inclination (i)
154.9°
Longitude of node (O)
170.4°
Periastron epoch (T)
B1997.995
Argument of periastron (?)
(secondary)
39.4°
Database references
SIMBAD
data
Other designations
Albireo (ß Cyg, ß Cygni, Beta Cyg, Beta Cygni) is the fifth brightest star in the constellation Cygnus. Although it has the Bayer designation beta, it is fainter than Gamma Cygni, Delta Cygni, and Epsilon Cygni. Albireo appears to the naked eye to be a single star of magnitude 3 but through a telescope, even low magnification views resolve it into a double star. The brighter yellow star (actually itself a very close binary system) makes a striking colour contrast with its fainter blue companion star.
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Created By:
System
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