30 Cygni

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

note (category: star names):

There is very much confusion in the literature as to which of the three stars HR 7730, 7735, 7751 should be called Omicron1 and which Omricron2: HR FL SOME BAC Others 7730 30 Omicron1 Omicron1 - 7735 31 Omicron2 Omicron2 Omicron1 7751 32 - Omicron3 Omicron2 For these stars, the Greek letter is hence omitted from the Name column.

position, motion, parallax:

position (J2000)	RA: 20h 13min 18sec	DEC: +46° 48' 57''
position (2001,17)	RA: 20h 13min 20sec	DEC: +46° 49' 10''
position (B1900)	RA: 20h 10min 9,4sec	DEC: +46° 30' 47''
proper motion (J2000)	RA: 0,012 arcsec/a	DEC: -0,001 arcsec/a
radial velocity	-26 km/s note: suspected variable radial velocity
rotational velocity	146 km/s (uncertain) (variable)
trigonometric parallax	0,012 arcsec
galactic coordinates	longitude: 82,71°	latitude: 6,87°

magnitude

visual magnitude

4,83
(V on UBV Johnson system)

spectral / color information

spectral class	A5IIIn
B-V-magnitude	0,09
U-B-magnitude	0,15
R-I-magnitude

variability information

variable star identification

12926

note (category: variability):

Delta Sct?

double/multiple star system information

number of components of multiple star system	6
separation	337,5 arcsec
mag difference (of double or brightest multiple)	1
component ID	AD

note (category: double and multiple data):

Component D of ADS 13554 of which primary is HR 7735.

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

position, motion, parallax:

position (J2000)	RA: 20h 13min 18,074sec	DEC: +46° 48' 56,79''	ą0,35 arcsec	source: 17
position (2001,17)	RA: 20h 13min 20sec	DEC: +46° 49' 10''	JD: 2451973,12
proper motion (J2000)	RA: 0,0018 arcsec/a	DEC: 0,004 arcsec/a		source: 25
radial velocity	-26 km/s			source: 25
trigonometric parallax	0,012 arcsec		ą0,001 arcsec	source: 25
galactic coord. (B1950)	longitude: 82,71°	latitude: 6,87°

magnitude:

visual	4,83 (observed)	source: 25
photovisual	5	source: 2
photographic	5	source: 16

spectral information:

spectral class	A2		source: 96
Morgan-Keenan	A5IIIn		source: 25
B-magnitude	4,92 ą0,05	B-V-magnitude	0,09
U-magnitude	5,07 ą0,05	U-B-magnitude	0,15

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	433,6 arcsec
magnitude difference between brightest and second brightest component	2,1
position angle	150 °

component	magnitude	spectral class	catalogue(s)/name(s)
A	3,79	K0	31 Cyg, HR 7735, HD 192577, SAO 49337
B	4,83	A2	30 Cyg, HR 7730, HD 192514, SAO 49332
C	6,99	B9

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
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
17	ACRS
Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 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 11min 43,632sec	DEC: +46° 39' 48,9''	ą0,016 arcsec
position (2001,17)	RA: 20h 13min 21sec	DEC: +46° 49' 10''	JD: 2451973,12
position (J2000)	RA: 20h 13min 18,019sec	DEC: +46° 48' 56,5''
proper motion B1950 (FK4)	RA: 0,0008 arcsec/a	DEC: 0,001 arcsec/a	ą0,003 arcsec/a in RA ą0,002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0,0012 arcsec/a	DEC: -0,001 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	A2
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Double star in Aitken's Double Star Catalogue (Aitken 1932)

catalogues

source catalogue	GC, catalogue number: 28091
Durchmusterung	BD+46 2881
Boss General Catalogue	28091
Henry Draper Catalogue	192514

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

position and proper motion:

position (J2000)	RA: 20h 13,6min	DEC: +46° 44'
proper motion (J2000)	RA: 0,004 arcsec/a	DEC: 0,003 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	1949	5	140°	0,1''	3,78	-	K2II+B3V	WRH
Aa	1985	5	111°	0''	3,78	-	K2II+B3V	WRH
Aa-B	1878	2	331°	36,6''	3,78	13,3	-	HJ 1495
Aa-C	1836	12	173°	107''	3,78	6,99	-	STF 50
Aa-D	1835	9	323°	337,5''	3,78	5	-	STF 50
Aa-F	1878	1	170°	43,2''	3,78	-	-	BU 1483
CG	1878	1	92°	40,1''	-	-	-	BU 1483
CH	1878	1	62°	60,5''	-	-	-	BU 1483
CI	1878	1	136°	60,5''	-	-	-	BU 1483
DC	1901	1	150°	433,6''	4,83	6,9	A5IIIn	GUI
DE	1900	2	252°	32,9''	4,83	13,2	-	ES 26
DE	1912	2	251°	34,3''	4,83	13,2	-	ES 26

discoverer information:

discoverer code	discoverer	reference
WRH	Wilson, R.H.
HJ 1495	Herschel, J.	-
STF 50	Struve, F.G.W.	-
BU 1483	Burnham, S.W.	-
GUI	Guillaume, J.
ES 26	Espin, T.E.	(Mon. Not. R. Astron. Soc. 88, 185; 1928.)

notes:

note	31 Cyg. STF 50, App I. Aa seen single in 1953, resolved once again by McAlister in 1980. A is the Algol-type eclipsing system V695 Cyg; spectrum K2II+B3V. DC: 30 Cyg.

data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)

position:

position (equinox 1950.0)

RA: 20h 11min 43,6sec

DEC: +46° 39' 49''

variability informations:

magnitute at max. brightness	4,81
magnitute at min. brightness	4,84
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

references

to a study

522428D (designation: 30 CYG)

miscanellous

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

catalogues and names	NSV 12926, 30 Cyg, HR 7730, HD 192514, SAO 49332, BD +46 2881, WDS 20136+4644D
constellation	Cygnus