Global InformationAlbireo information
  | |
| 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] |
| Distance | 364.8+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] |
| Distance | 395.4+2.9 −3.3 ly (121.3+0.9 −1 pc)[10] |
| Position (relative to Albireo A) | |
| Component | Albireo B |
| Epoch of observation | 2006 |
| Angular distance | 35.3″ [13] |
| Position angle | 54° [13] |
| Orbit[2] | |
| Primary | Aa |
| Companion | Ac |
| 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 | |
| Mass | 5.2[2] M☉ |
| Radius | 58.69+2.83 −3.12[14] R☉ |
| Luminosity (bolometric) | 1,259[2] L☉ |
| Surface gravity (log g) | 0.93[2] cgs |
| Temperature | 4,383[2] K |
| Metallicity [Fe/H] | −0.1[15] dex |
| Rotational velocity (v sin i) | 8.34[2] km/s |
| Albireo Ac | |
| Mass | 2.7[2] M☉ |
| Radius | 3.0[a] R☉ |
| Luminosity (bolometric) | 79[2] L☉ |
| Temperature | 10,000[2] K |
| Albireo B | |
| Mass | 3.7 ± 0.8[16] M☉ |
| Radius | 2.59[17] R☉ |
| Luminosity (bolometric) | 230 ± 90[16] L☉ |
| Surface gravity (log g) | 4.00 ± 0.15[16] cgs |
| Temperature | 13,200 ± 600[16] K |
| Age | 100[16] Myr |
| Other designations | |
β Cygni, 6 Cygni, ADS 12540, CCDM J19307+2758, WDS 19307+2758[18][19][20] | |
| 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[21] | |
| Database references | |
| SIMBAD | β Cyg (STF 4043) |
| Albireo A | |
| Albireo Aa | |
| Albireo Ab | |
| Albireo B | |
Albireo /ælˈbɪrioʊ/[22] 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.[23] 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 binary system, makes a striking colour contrast with its fainter blue companion.[24]
- ^ a b Cite error: The named reference
tycho2was invoked but never defined (see the help page). - ^ a b c d e f g h i j k l Cite error: The named reference
drimmel2021was invoked but never defined (see the help page). - ^ a b c Cite error: The named reference
tychowas invoked but never defined (see the help page). - ^ a b Cite error: The named reference
edr3Bwas invoked but never defined (see the help page). - ^ a b c d Cite error: The named reference
photometrywas invoked but never defined (see the help page). - ^ a b c d Cite error: The named reference
ginestetwas invoked but never defined (see the help page). - ^ a b Cite error: The named reference
bsdwas invoked but never defined (see the help page). - ^ Cite error: The named reference
levenhagenwas invoked but never defined (see the help page). - ^ 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.
- ^ 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 - ^ Cite error: The named reference
asccwas invoked but never defined (see the help page). - ^ 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.
- ^ a b Cite error: The named reference
wdsbwas invoked but never defined (see the help page). - ^ Cite error: The named reference
npoiwas invoked but never defined (see the help page). - ^ Cite error: The named reference
lefevrewas invoked but never defined (see the help page). - ^ a b c d e Cite error: The named reference
physparmswas invoked but never defined (see the help page). - ^ Cite error: The named reference
fracassiniwas invoked but never defined (see the help page). - ^ Cite error: The named reference
simbadawas invoked but never defined (see the help page). - ^ Cite error: The named reference
wdsawas invoked but never defined (see the help page). - ^ Cite error: The named reference
piscowas invoked but never defined (see the help page). - ^ Cite error: The named reference
simbadbwas invoked but never defined (see the help page). - ^ Cite error: The named reference
Kunitzschwas invoked but never defined (see the help page). - ^ Cite error: The named reference
IAU-CSNwas invoked but never defined (see the help page). - ^ Cite error: The named reference
starswas invoked but never defined (see the help page).
Cite error: There are <ref group=lower-alpha> tags or {{efn}} templates on this page, but the references will not show without a {{reflist|group=lower-alpha}} template or {{notelist}} template (see the help page).