{{Starbox 2x | name={{SIMBAD link|HD+183912|Albireo A}} | image=[[Image:Position beta Cyg.png|250px]] | caption=Albireo's position, lower right corner. <br /> The cross-like figure is the Northern Cross. <br /> The blue line shows the boundaries of the constellation the Swan. | epoch=[[J2000.0]] ([[International Celestial Reference System|ICRS]]) | constell=[[Cygnus (constellation)|Cygnus]] | ra_system_h=1 | ra_system_m=2 | ra_system_s=3 | dec_system_d=4 | dec_system_m=5 | dec_system_s=6 | dec_system=bar | radec_system_reference=<sup>blotz</sup> | ra_a_1=asdfasdf | ra_a_2=fl2 | dec_a_1=x | radec_a_reference=<ref name=viziera>[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/239/h_dm_com&recno=19929 HIP 95947, record for component 1], [[Hipparcos catalogue]]; [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://vizier.u-strasbg.fr/viz-bin/Cat?I/239 I/239].</ref> | ra_b_h=19 | ra_b_m=30 | dec_b_d=+27 | dec_b_m=57 | dec_b_s=34.61 | radec_b_reference=<ref name=vizierb>[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/239/h_dm_com&recno=19930 HIP 95947, record for component 2], [[Hipparcos catalogue]]; [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://vizier.u-strasbg.fr/viz-bin/Cat?I/239 I/239].</ref> | prop_mo_ra_a=−7.09<ref name=viziera /> | prop_mo_dec_a=−5.63<ref name=viziera /> | prop_mo_ra_b=5.04<ref name=vizierb /> | prop_mo_dec_b=6.48<ref name=vizierb /> | parallax=8.46 | p_error=0.58 | class_a=K3III<ref name=wds>Entry, [http://ad.usno.navy.mil/wds/wdsnewframe4.html The Washington Double Star Catalog], identifier 19307+2758, discoverer identifier MCA 55. Accessed on line [[July 9]], [[2008]].</ref> | class_b=B0V<ref name=wds /> | parallax_footnote=<ref name=simbada>{{SIMBAD link|HD+183912|CCDM J19307+2758A -- Double or multiple star}}, database entry, [[SIMBAD]]. Accessed on line [[July 9]], [[2008]].</ref> |appmag_v_a=3.18<ref name=bsd>Binary Star Differential Photometry Using the Adaptive Optics System at Mount Wilson Observatory, Theo ten Brummelaar, Brian D. Mason, et al., ''Astronomical Journal'' '''119''', #5 (May 2000), pp. 2403–2414. {{doi|10.1086/301338}}. {{bibcode|2000AJ....119.2403T}}. See tables 4, 5, 6, and 8. Luminosity from L<sub>bol</sub>=10<sup>2(4.75−M<sub>bol</sub>)/5</sup>.</ref> |appmag_v_b=5.82<ref name=bsd /> |v-r_a=0.92<ref name=bsd /> |v-r_b=0.09<ref name=bsd /> |absmag_v_a=−2.18<ref name=bsd /> |absmag_v_b=0.46<ref name=bsd /> |temperature_a=4080 ± 10<ref name=bsd /> |temperature_b=30000 ± 100<ref name=bsd /> |luminosity_a=1200 ± 200<ref name=bsd /> |luminosity_b=950 ± 250<ref name=bsd /> |mass_a=5<ref name=stars /> |mass_b=3.2<ref name=stars /> |radius_a=16<ref>[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=II/224/cadars&recno=8926 Entry, HD 183912], Catalogue of Stellar Diameters (CADARS); [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://vizier.u-strasbg.fr/viz-bin/Cat?II/224 II/224].</ref> |orbit_source=<ref name=wdsa>Entry, WDS identifier 19307+2758, [http://ad.usno.navy.mil/wds/orb6/orb6frames.html Sixth Catalog of Orbits of Visual Binary Stars], William I. Hartkopf & Brian D. Mason, U.S. Naval Observatory. Accessed on line [[July 9]], [[2008]].</ref> |period=213.859 |axis_unitless=0.536[[Arcsecond|″]] |inclination=154.9 |node=170.4 |periastron=B1997.995 |eccentricity=0.256 |periarg=39.4 |names=β Cygni A, β<sup>1</sup> Cygni, 6 Cygni A, [[Aitken Double Star Catalogue|ADS]] 12540 A, [[Durchmusterung|BD]]+27 3410, [[Catalogue of Components of Double and Multiple Stars|CCDM]] J19307+2758A, FK5 732, [[Henry Draper Catalogue|HD]] 183912/183913, [[Hipparcos Catalogue|HIP]] 95947, [[Bright Star Catalogue|HR]] 7417, MCA 55 Aac, NSV 12105, [[Smithsonian Astrophysical Observatory Star Catalogue|SAO]] 87301, [[Washington Double Star Catalog|WDS]] 19307+2758Aac<ref name=wdsa /><ref name=pisco>Speckle observations with PISCO in Merate: IV. Astrometric measurements of visual binaries in 2005, M. Scardia et al., ''Astronomische Nachrichten'' '''329''', #1 (2008), pp. 54–68. {{bibcode|2008AN....329...54S}}. {{doi|10.1002/asna.200710834}}.</ref><ref name=simbada /> }}