56 Cygni

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

position, motion, parallax:

position (J2000)	RA: 20h 50min 4.9sec	DEC: +44° 3' 34''
position (B1900)	RA: 20h 46min 31.7sec	DEC: +43° 40' 57''
proper motion (J2000)	RA: 0.126 arcsec/a	DEC: 0.133 arcsec/a
radial velocity	-21 km/s note: suspected variable radial velocity
rotational velocity	90 km/s (uncertain) (variable)
trigonometric parallax	0.025 arcsec
galactic coordinates	longitude: 84.29°	latitude: 0.03°

magnitude

visual magnitude

5.04
(V on UBV Johnson system)

spectral / color information

double/multiple star system information

separation	75.5 arcsec
mag difference (of double or brightest multiple)	6
note	Worley (1978) update of the IDS

miscellaneous information

note (category: group membership):

Hyades moving group.

note (category: miscellaneous):

In Schurig's Atlas this is mistakenly labelled 58 Cyg for 56 Cyg.

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

position, motion, parallax:

magnitude:

visual	5.04 (observed)	source: 25
photovisual	5.1	source: 2

spectral information:

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	72.5 arcsec
magnitude difference between brightest and second brightest component	6.1
position angle	46 °

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: 20h 48min 18.237sec	DEC: +43° 52' 12.6''	±0.013 arcsec
position (J2000)	RA: 20h 50min 4.936sec	DEC: +44° 3' 33.71''
proper motion B1950 (FK4)	RA: 0.0113 arcsec/a	DEC: 0.137 arcsec/a	±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0116 arcsec/a	DEC: 0.135 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5.1 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	A5
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

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

position and proper motion:

position (J2000)	RA: 20h 50.1min	DEC: +44° 4'
proper motion (J2000)	RA: 0.126 arcsec/a	DEC: 0.133 arcsec/a

double/multiple star system information:

discoverer information:

notes:

note

56 Cyg.

catalogues and names	NSV 25361, 56 Cyg, HR 7984, HD 198639, SAO 50121, BD +43 3739, FK5: 3666, WDS 20501+4404A
constellation	Cygnus