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

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

catalogues and names

catalogues and names	u Cyg, ups Cyg, 66 Cyg, HR 8146, HD 202904, SAO 71173, BD +34 4371, FK5: 1559, WDS 21179+3454A
constellation	Cygnus

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

position, motion, parallax:

position (J2000)	RA: 21h 17min 55.1sec	DEC: +34° 53' 49''
position (B1900)	RA: 21h 13min 48.3sec	DEC: +34° 28' 37''
proper motion (J2000)	RA: 0.014 arcsec/a	DEC: -0.002 arcsec/a
radial velocity	4 km/s note: spectroscopic binaries
rotational velocity	261 km/s (uncertain) (variable)
trigonometric parallax	0.019 arcsec
galactic coordinates	longitude: 80.98°	latitude: -10.05°

magnitude

visual magnitude

4.43 (V on UBV Johnson system)

spectral / color information

spectral class	B2Vne
B-V-magnitude	-0.11
U-B-magnitude	-0.82
R-I-magnitude

variability information

variable star identification

Ups Cyg

note (category: variability):

4.28 - 4.50V.

double/multiple star system information

number of components of multiple star system	3
separation	15.3 arcsec
mag difference (of double or brightest multiple)	6.4
component ID	AB

note (category: double and multiple data):

AB CPM; 79000?y. Component B, 10.0v G8.5V, probably optical.

note (category: spectroscopic binaries):

ADS 14831A. Expanding circumstellar shell.

miscellaneous information

note (category: group membership):

Cyg OB4.

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

position, motion, parallax:

position (J2000)	RA: 21h 17min 55.078sec	DEC: +34° 53' 48.68''	±0.06 arcsec	source: 15
proper motion (J2000)	RA: 0.0012 arcsec/a	DEC: -0.002 arcsec/a		source: 25
radial velocity	4 km/s			source: 25
trigonometric parallax	0.019 arcsec		±0.002 arcsec	source: 25
galactic coord. (B1950)	longitude: 80.98°	latitude: -10.05°

magnitude:

visual	4.225 (observed)	source: 31
photovisual	4.4	source: 2

spectral information:

spectral class	B3		source: 96
Morgan-Keenan	B2Vne		source: 25
B-magnitude	4.32 ±0.05	B-V-magnitude	-0.11
U-magnitude	3.5 ±0.05	U-B-magnitude	-0.82

variability information:

source of data: 30

variability type	264
var. amplitude	0.22

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	15.1 arcsec
magnitude difference between brightest and second brightest component	5.6
position angle	220 °

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
30	GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
31	CRM' (non-GCVS variable data)
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 15min 51.555sec	DEC: +34° 41' 9.87''	±0.006 arcsec
position (J2000)	RA: 21h 17min 55.072sec	DEC: +34° 53' 48.58''
proper motion B1950 (FK4)	RA: 0.0009 arcsec/a	DEC: 0 arcsec/a	±0.002 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0011 arcsec/a	DEC: -0.003 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.4 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	B3p
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 1559
Durchmusterung	BD+34 4371
Boss General Catalogue	29802
Henry Draper Catalogue	202904

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

position and proper motion:

position (J2000)	RA: 21h 17.9min	DEC: +34° 54'
proper motion (J2000)	RA: 0.014 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
AB	1849	13	220°	15.1''	4.43	10	B2Vne	STT 433
AC	1849	14	177°	21.2''	4.43	10	-	STT 433
	1982		183°	21.2''
AD	1982	1	308°	57.3''	4.4	12	-	SLE 382
BC	1946	1	137°	13.6''	10	10	-	STT 433

discoverer information:

discoverer code	discoverer	reference
STT 433	Struve, O.	-
SLE 382	Soulie, G.	-

notes:

note	Upsilon Cyg. Burnham refers to a star twice the distance of C in 60@. A Variable?

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)

position:

position (equinox 1950.0)

RA: 21h 15min 51.6sec

DEC: +34° 41' 10''

variability informations:

variability type	GCAS	eruptive variable star
magnitute at max. brightness	4.28
magnitute at min. brightness	4.5
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

B2Vne

references

to a chart/photograph

no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue	31/9020
constellation	Cygnus
notes on existence	The star is equivalent to '0319022 khi'.
There are notes in published catalog.

variability type description

variability type	description
GCAS	Eruptive irregular variables of the Gamma Cas type. These are rapidly rotating B III-IVe stars with mass outflow from their equatorial zones. The formation of equatorial rings or disks is often accompanied by temporary fading. Light amplitudes may reach 1.5 mag in V.