Albiero

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

note (category: star names):

ALBIREO.

position, motion, parallax:

position (J2000)	RA: 19h 30min 43,3sec	DEC: +27° 57' 35''
position (2001,17)	RA: 19h 30min 46sec	DEC: +27° 57' 44''
position (B1900)	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
galactic coordinates	longitude: 62,11°	latitude: 4,57°

note (category: dynamical parallaxes):

0.009".

magnitude

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

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''	ą0,06 arcsec	source: 15
position (2001,17)	RA: 19h 30min 46sec	DEC: +27° 57' 44''	JD: 2451973,10
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 arcsec		ą0,002 arcsec	source: 25
galactic coord. (B1950)	longitude: 62,11°	latitude: 4,57°

magnitude:

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 ą0,05	B-V-magnitude	1,13
U-magnitude	4,83 ą0,05	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	+++

sources:

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 (B1950)	RA: 19h 28min 42,222sec	DEC: +27° 51' 12,44''	ą0,004 arcsec
position (2001,17)	RA: 19h 30min 46sec	DEC: +27° 57' 43''	JD: 2451973,10
position (J2000)	RA: 19h 30min 43,309sec	DEC: +27° 57' 34,59''
proper motion B1950 (FK4)	RA: 0,0001 arcsec/a	DEC: -0,002 arcsec/a	ą0,001 arcsec/a in RA ą0,001 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

magnitude:

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.

catalogues

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
Aa	1992	22	150°	-	3,08	-	K3II+B0V	MCA 55
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.	-

notes:

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:

position (equinox 1950.0)

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

references

to a study

2098D (designation: BETA CYG)

miscanellous

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

catalogues and names	Albiero, b¹Cyg, NSV 12105, 6 Cyg, HR 7417, HD 183912, SAO 87301, BD +27 3410, FK5: 732, WDS 19307+2758A
constellation	Cygnus