61 Cygni

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

position, motion, parallax:

position (J2000)	RA: 21h 6min 55.3sec	DEC: +38° 44' 36''
position (2000.73)	RA: 21h 6min 57sec	DEC: +38° 44' 49''
position (B1900)	RA: 21h 2min 26.3sec	DEC: +38° 15' 10''
proper motion (J2000)	RA: 4.126 arcsec/a	DEC: 3.208 arcsec/a
radial velocity	-64 km/s note: suspected variable radial velocity
rotational velocity	=<25 km/s (uncertain) (variable)
trigonometric parallax	0.294 arcsec
galactic coordinates	longitude: 82.25°	latitude: -5.81°

note (category: dynamical parallaxes):

0.330".

magnitude

visual magnitude

6.03
(V on UBV Johnson system)

spectral / color information

spectral class	K7V
B-V-magnitude	1.37
U-B-magnitude	1.23
R-I-magnitude
IR-note	object is infrared source (uncertain identification)

variability information

variable star identification

13546

note (category: variability):

ADS 14636B, Is, 6.02 - 6.09V.

double/multiple star system information

number of components of multiple star system	6
separation	28.7 arcsec
mag difference (of double or brightest multiple)	0.8
component ID	AB

note (category: double and multiple data):

See HR 8085.

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

position, motion, parallax:

position (J2000)	RA: 21h 6min 55.268sec	DEC: +38° 44' 31.45''	ą0.06 arcsec	source: 15
position (2000.73)	RA: 21h 6min 57sec	DEC: +38° 44' 44''	JD: 2451812.05
proper motion (J2000)	RA: 0.3517 arcsec/a	DEC: 3.111 arcsec/a		source: 25
radial velocity	-64 km/s			source: 25
trigonometric parallax	0.294 arcsec		ą0.029 arcsec	source: 25
galactic coord. (B1950)	longitude: 82.25°	latitude: -5.81°

magnitude:

visual	6.03 (observed)	source: 25
photovisual	6.3	source: 2
photographic	7.3	source: 16

spectral information:

spectral class	K5		source: 96
Morgan-Keenan	K7V		source: 25
B-magnitude	7.4 ą0.05	B-V-magnitude	1.37
U-magnitude	8.63 ą0.05	U-B-magnitude	1.23

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	375.8 arcsec
position angle	208 °

component	magnitude	spectral class	catalogue(s)/name(s)
A	5.21	K5	61 Cyg, HR 8085, HD 201091, SAO 70919
B	6.03	K5	61 Cyg, HR 8086, HD 201092,
C	10.25	A0

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
16	PPM North and PPM South Catalogs and PPM Supplement
Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993
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 The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000)	RA: 21h 6.9min	DEC: +38° 45'
proper motion (J2000)	RA: 0 arcsec/a	DEC: 0 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
AB	1822	often	86°	14.9''	5.23	6.05	K5V K7V	STF2758
	1993		149°	30.4''
AC	1907	2	196°	306.1''	5.6	-	-	STF2758
	1914		195°	321.4''
AD	1918	1	282°	304.9''	5.7	8.6	-	STF2758
AE	1918	1	12°	306''	5.7	8.1	-	STF2758
Aa	1918	2	31°	157.1''	5.6	10.5	-	STF2758
	1921		30°	140.6''
BC	1902	3	198°	277.7''	6.3	-	K7V	STF2758
	1924		208°	375.8''

discoverer information:

discoverer code	discoverer	reference
STF2758	Struve, F.G.W.	-

notes:

note	61 Cyg. Premature orbits have been computed for AB. Proper motion of A +4136 +3203. B is BD+38@4344. Proper motion of B +4122 +3125.

data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)

position:

position (B1900)

RA: 21h 2.4min

DEC: +38° 15'

magnitudes, spectral classes, orbital elements:

author:	F.J. Josties
date of observation:	1980
magnitude of component A:	5.22
magnitude of component B:	5.22
spectral class component B:	K5V
spectral class component B:	K5V
period [y]:	722
semi-major axis [arcsec]:	24.65
inclination [deg]:	51.85
node [deg]:	172.3 (ascending)
equinox of node:	2000
eccentricity:	0.401
time of periastron passage:	1689.7
grade:	indeterminate
reference:	I.A.U. Colloquium No. 62, 1981.

notes

An estimated mass has been used to compute the otherwise nearly indeterminate orbit; thus the orbit should not be used to compute the mass. The RV difference from which the ascending node is inferred is quite small. Various small variations, formerly suspected in the period range of about 5-10 years, are absent in the strong photographic coverage of the last decades.

catalogues and names	NSV 13546, 61 Cyg, HR 8086, HD 201092, WDS 21069+3845B
constellation	Cygnus