catalogues and names

The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

The Washington Visual Double Star Catalog, 1996.0

4th Catalog of Orbits of Visual Binaries

Combined General Catalogue of Variable Stars (Vol. I-III)

additional / editable data

catalogues and names

catalogues and names	V1803 Cyg, 61 Cyg, HR 8085, HD 201091, SAO 70919, BD +38 4343, FK5: 793, WDS 21069+3845A
constellation	Cygnus

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

position, motion, parallax:

position (J2000)	RA: 21h 6min 54,6sec	DEC: +38° 44' 45''
position (2001,17)	RA: 21h 6min 58sec	DEC: +38° 45' 6''
position (B1900)	RA: 21h 2min 24,8sec	DEC: +38° 15' 31''
proper motion (J2000)	RA: 4,136 arcsec/a	DEC: 3,203 arcsec/a
radial velocity	-64 km/s note: variable radial velocity
rotational velocity	<17 km/s (uncertain) (variable)
trigonometric parallax	0,292 arcsec
galactic coordinates	longitude: 82,25°	latitude: -5,81°

note (category: dynamical parallaxes):

0.300".

magnitude

visual magnitude

5,21 (V on UBV Johnson system)

spectral / color information

spectral class	K5V
B-V-magnitude	1,18
U-B-magnitude	1,11
R-I-magnitude

variability information

variable star identification

V1803 Cyg

note (category: variability):

5.19 - 5.27V, 350 - 400d.

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):

AB 5.22 K5V, 6.04 K7V, 722y, a = 24.65". B is HR 8086. Aa x P, 4.9y, a = 0.014". Astrometric measures indicate 3 invisible companions, periods 6, 7 and 12y. Unresolved by speckle interferometry. Suspected planetary companion not substantiated.

miscellaneous information

note (category: group membership):

61 Cyg group.

note (category: miscellaneous):

Proper motions for HR 8085 and 8086 taken from Luyten LHS. SAO has only one entry (component A?), but appears to give the mean position of A and B.

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

position, motion, parallax:

position (J2000)	RA: 21h 6min 53,951sec	DEC: +38° 44' 57,83''	±0,06 arcsec	source: 15
position (2001,17)	RA: 21h 6min 57sec	DEC: +38° 45' 19''	JD: 2451973,11
proper motion (J2000)	RA: 0,3535 arcsec/a	DEC: 3,203 arcsec/a		source: 25
radial velocity	-64 km/s			source: 25
trigonometric parallax	0,292 arcsec		±0,029 arcsec	source: 25
galactic coord. (B1950)	longitude: 82,25°	latitude: -5,81°

magnitude:

visual	5,21 (observed)	source: 25
photovisual	5,6	source: 2
photographic	6,7	source: 16

spectral information:

spectral class	K5		source: 96
Morgan-Keenan	K5V		source: 25
B-magnitude	6,39 ±0,05	B-V-magnitude	1,18
U-magnitude	7,5 ±0,05	U-B-magnitude	1,11

variability information:

source of data: 27

variability type	430
var. amplitude	0,1

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	30,4 arcsec
magnitude difference between brightest and second brightest component	0,82
position angle	149 °

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
27	Catalog of Red Magnitudes (CRM)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 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: 21h 4min 39,935sec	DEC: +38° 29' 59,1''	±0,004 arcsec
position (2001,17)	RA: 21h 6min 40sec	DEC: +38° 42' 22''	JD: 2451973,11
position (J2000)	RA: 21h 6min 54,572sec	DEC: +38° 44' 44,83''
proper motion B1950 (FK4)	RA: 0,3523 arcsec/a	DEC: 3,185 arcsec/a	±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0,3528 arcsec/a	DEC: 3,197 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5,4 (accuracy: 2 decimals)
source of visual magnitude data	Combined magnitude of component stars.

spectral information:

spectral class	K5
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Double star - see source catalog for source

catalogues

source catalogue	FK4, catalogue number: 793
Durchmusterung	BD+38 4343
Boss General Catalogue	29509
Henry Draper Catalogue	201091 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: 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.