The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. The Washington Visual Double Star Catalog, 1996.0

  5. Combined General Catalogue of Variable Stars (suspected variables)

catalogues and names Albiero, b1Cyg, NSV 12105, 6 Cyg, HR 7417, HD 183912, SAO 87301, FK5: 732, WDS 19307+2758A
constellation Cygnus

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)

note (category: star names): ALBIREO.

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

position, motion, parallax:

position (J2000) RA: 19h 30min 43,3sec DEC: +27 57' 35''
position (J1900) RA: 19h 26min 41,3sec DEC: +27 44' 58''
proper motion (J2000) RA: 0,002 arcsec/a DEC: -0,002 arcsec/a
radial velocity -24 km/s
note: variable radial velocity
rotational velocity =<25 km/s (uncertain) (variable)
trigonometric parallax 0,017 arcsec
note (category: dynamical parallaxes): 0.009".


visual magnitude 3,08
(V on UBV Johnson system)

spectral / color information

spectral class K3II+B9.5V
B-V-magnitude 1,13
U-B-magnitude 0,62
R-I-magnitude 0,66

variability information

variable star identification 12105

double/multiple star system information

number of components of multiple star system 3
separation 34,7 arcsec
mag difference (of double or brightest multiple) 2
component ID AB
note (category: double and multiple data): 7270.2y, a = 62.90". Binary with HR 7418. vsini of B-type component of ADS 12540A 50:k/s. Component C, 11v at 50". Two additional components of A resolved by speckle interferometry: Aa 1981.70, sep. 0.42"; Ap 1978.41, sep. 0.12" and 1979.46, sep. <0.08".

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000) RA: 19h 30min 43,301sec DEC: +27 57' 34,83'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0002 arcsec/a DEC: -0,002 arcsec/a source: 25
radial velocity -24 km/s source: 25
trigonometric parallax 0,017 0,002 arcsec source: 25
galactic coord. (B1950) longitude: 62,11 latitude: 4,57
GCI unit vector (J2000) X: 0,340584 Y: -0,814974 Z: 0,46885


visual 3,08 (observed) source: 25
photovisual 3,2 source: 2

spectral information:

spectral class K0 source: 96
Morgan-Keenan K3II source: 25
B-magnitude 4,21 0,05 B-V-magnitude 1,13
U-magnitude 4,83 0,05 U-B-magnitude 0,62

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 0,4 arcsec
position angle 150

component magnitude spectral class catalogue(s)/name(s)
A 3,08 K0 Albiero, b1Cygni, 6 Cyg, HR 7417, HD 183912, SAO 87301
B 3,36 +++


2 HD and HDE Catalogs
Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University
15 FK5, FK5 Extension and FK5 Supplement
Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 1991
19 WDS Catalog
Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996
25 Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
96 SAO or HD/HDE Catalog
Reference from Value 1 or Reference from Value 2

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (J1950) RA: 19h 28min 42,222sec DEC: +27 51' 12,44'' 0,004 arcsec
position (J2000) RA: 19h 30min 43,309sec DEC: +27 57' 34,59''
proper motion J1950 (FK4) RA: 0,0001 arcsec/a DEC: -0,002 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0003 arcsec/a DEC: -0,004 arcsec/a
source of proper motion data Determined by source catalog


visual 3,2 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class +++
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.


source catalogue FK4, catalogue number: 732
Durchmusterung BD+27 3410
Boss General Catalogue 26953
Henry Draper Catalogue 183912
The "SAO Catalog" entry refers to two consecutive HD numbers, the lower of which is given.

data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000) RA: 19h 30,7min DEC: +27 58'
proper motion (J2000) RA: 0,002 arcsec/a DEC: -0,002 arcsec/a

double/multiple star system information:

component year number of measures position angle angular separation magnitude of 1st component magnitude of 2nd component spectral class(es) discoverer code
Aa 1976 22 190 0,4'' 3,08 - K3II+B0V MCA 55
1992 150 -
Aa-B 1822 often 54 34,5'' 3,08 5,11 - STF 43

discoverer information:

discoverer code discoverer reference
MCA 55 McAlister, H.A. -
STF 43 Struve, F.G.W. -


note Aa: Beta (1) Cyg. Resolved in 1976 by speckle interferometry and has also been seen visually. Aa-B: B is BD+27@3411. Proper motion of B +003 -004, spectrum B8V.

data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)


position (J1950) RA: 19h 28min 42,2sec DEC: +27 51' 12''

variability informations:

magnitute at max. brightness 3,05
magnitute at min. brightness 3,12
photometric system visual, photovisual or Johnson's V

spectral information

spectral class *


to a study 2098D (designation: BETA CYG)


There are notes in the published catalog (Kukarkin et al.(1982)).