Albireo

Albireo
Location of Albireo (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cygnus
Albireo Aa
Right ascension 19h 30m 43.286s[1]
Declination +27° 57′ 34.84″[1]
Apparent magnitude (V) 3.21[2]
Albireo Ac
Right ascension 19h 30m 43.295s[3]
Declination +27° 57′ 34.62″[3]
Apparent magnitude (V) 5.85[2]
Albireo B
Right ascension 19h 30m 45.3962s[4]
Declination +27° 57′ 54.989″[4]
Apparent magnitude (V) 5.11[5]
Characteristics
Albireo Aa
Evolutionary stage Bright giant
Spectral type K2II[6]
B−V color index +1.13[5]
V−R color index +0.92[7]
Albireo Ac
Spectral type B8:p[6]
B−V color index +0.09[3]
V−R color index +0.09[7]
Albireo B
Spectral type B8Ve[8]
U−B color index -0.32[5]
B−V color index -0.10[5]
Astrometry
Albireo A
Radial velocity (Rv)−23.54[2] km/s
Proper motion (μ) RA: 4.915 mas/yr[9]
Dec.: −11.127 mas/yr[9]
Parallax (π)8.9816 ± 0.4474 mas[9]
Distance364.8+15.6
−15.3 ly
(111.9+4.8
−4.7 pc)[10]
Albireo Aa
Absolute magnitude (MV)−2.45[6]
Albireo Ac
Absolute magnitude (MV)−0.25[6]
Albireo B
Radial velocity (Rv)−18.80[11] km/s
Proper motion (μ) RA: −1.078[12] mas/yr
Dec.: −1.540[12] mas/yr
Parallax (π)8.1896 ± 0.0781 mas[12]
Distance395.4+2.9
−3.3 ly
(121.3+0.9
−1 pc)[10]
Position (relative to Albireo A)
ComponentAlbireo B
Epoch of observation2006
Angular distance35.3″ [13]
Position angle54° [13]
Orbit[2]
PrimaryAa
CompanionAc
Period (P)121.65+3.34
−2.90 yr
Semi-major axis (a)0.401+0.007
−0.006″
Eccentricity (e)0.20+0.01
−0.02
Inclination (i)156.15+2.90
−2.63°
Longitude of the node (Ω)84.43+5.27
−4.50°
Periastron epoch (T)B2026.36
Argument of periastron (ω)
(secondary)		54.72+1.88
−2.24°
Semi-amplitude (K1)
(primary)		2.91+0.09
−0.12 km/s
Details
Albireo Aa
Mass5.2[2] M☉
Radius58.69+2.83
−3.12[14] R☉
Luminosity (bolometric)1,259[2] L☉
Surface gravity (log g)0.93[2] cgs
Temperature4,383[2] K
Metallicity [Fe/H]−0.1[15] dex
Rotational velocity (v sin i)8.34[2] km/s
Albireo Ac
Mass2.7[2] M☉
Radius3.0[a] R☉
Luminosity (bolometric)79[2] L☉
Temperature10,000[2] K
Albireo Ad
Mass0.085 ± 0.007[16] M☉
Albireo B
Mass3.7 ± 0.8[17] M☉
Radius2.59[18] R☉
Luminosity (bolometric)230 ± 90[17] L☉
Surface gravity (log g)4.00 ± 0.15[17] cgs
Temperature13,200 ± 600[17] K
Age100[17] Myr
Other designations
β Cygni, 6 Cygni, ADS 12540, CCDM J19307+2758, WDS 19307+2758[19][20][21]
Albireo A: β¹ Cygni, BD+27 3410, HR 7417, HD 183912/183913, HIP 95947, SAO 87301, FK5 732, MCA 55 Aac, NSV 12105
Albireo B: β² Cygni, STF 4043B, BD+27 3411, HD 183914, HIP 95951, HR 7418, SAO 87302[22]
Database references
SIMBADβ Cyg (STF 4043)
Albireo A
Albireo Aa
Albireo Ab
Albireo B

Albireo /ælˈbɪrioʊ/[23] is a double star designated Beta Cygni (β Cygni, abbreviated Beta Cyg, β Cyg). The International Astronomical Union uses the name "Albireo" specifically for the brightest star in the system.[24] Although designated 'beta', it is fainter than Gamma Cygni, Delta Cygni, and Epsilon Cygni and is the fifth-brightest point of light in the constellation of Cygnus. Appearing to the naked eye to be a single star of magnitude 3, viewing through even a low-magnification telescope resolves it into its two components. The brighter yellow star, itself a very close trinary system, makes a striking colour contrast with its fainter blue companion.[25]

  1. ^ a b Cite error: The named reference tycho2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i j k l Cite error: The named reference drimmel2021 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference tycho was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference edr3B was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference photometry was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference ginestet was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference bsd was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference levenhagen was invoked but never defined (see the help page).
  9. ^ a b Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  10. ^ a b Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M.; Demleitner, M.; Andrae, R. (2021-03-01). "Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3". The Astronomical Journal. 161 (3): 147. arXiv:2012.05220. Bibcode:2021AJ....161..147B. doi:10.3847/1538-3881/abd806. ISSN 0004-6256. Data about this star can be seen here.
    Beta1 Cygni = Gaia DR3 2026116260337482112
    Beta2 Cygni = Gaia DR3 2026113339752723456
  11. ^ Cite error: The named reference ascc was invoked but never defined (see the help page).
  12. ^ a b c Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  13. ^ a b Cite error: The named reference wdsb was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference npoi was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference lefevre was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Albireo Ad was invoked but never defined (see the help page).
  17. ^ a b c d e Cite error: The named reference physparms was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference fracassini was invoked but never defined (see the help page).
  19. ^ Cite error: The named reference simbada was invoked but never defined (see the help page).
  20. ^ Cite error: The named reference wdsa was invoked but never defined (see the help page).
  21. ^ Cite error: The named reference pisco was invoked but never defined (see the help page).
  22. ^ Cite error: The named reference simbadb was invoked but never defined (see the help page).
  23. ^ Cite error: The named reference Kunitzsch was invoked but never defined (see the help page).
  24. ^ Cite error: The named reference IAU-CSN was invoked but never defined (see the help page).
  25. ^ Cite error: The named reference stars was invoked but never defined (see the help page).


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