Deneb el Okab

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

note (category: star names):

Deneb el Okab; Deneb. Combined with HR 7176.

position, motion, parallax:

position (J2000)	RA: 19h 5min 24.6sec	DEC: +13° 51' 48''
position (B1900)	RA: 19h 0min 48.8sec	DEC: +13° 42' 53''
proper motion (J2000)	RA: -0.005 arcsec/a	DEC: -0.096 arcsec/a
radial velocity	-25 km/s note: spectroscopic binaries
rotational velocity	331 km/s (uncertain) (variable)
trigonometric parallax	0.045 arcsec
galactic coordinates	longitude: 46.86°	latitude: 3.25°

note (category: dynamical parallaxes):

0.020".

magnitude

visual magnitude

2.99
(V on UBV Johnson system)

spectral / color information

spectral class	A0Vn
B-V-magnitude	0.01
U-B-magnitude	-0.01
R-I-magnitude
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

variability information

variable star identification

11724

double/multiple star system information

number of components of multiple star system	3
separation	158.6 arcsec
mag difference (of double or brightest multiple)	8.4
component ID	AC

miscellaneous information

note (category: group membership):

Pleiades group.

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

position, motion, parallax:

position (J2000)	RA: 19h 5min 24.611sec	DEC: +13° 51' 48.43''	±0.06 arcsec	source: 15
proper motion (J2000)	RA: -0.0003 arcsec/a	DEC: -0.096 arcsec/a		source: 25
radial velocity	-25 km/s			source: 25
trigonometric parallax	0.045 arcsec		±0.004 arcsec	source: 25
galactic coord. (B1950)	longitude: 46.86°	latitude: 3.25°

magnitude:

visual	2.99 (observed)	source: 25
photovisual	3	source: 2

spectral information:

spectral class	A0		source: 96
Morgan-Keenan	A0Vn		source: 25
B-magnitude	3 ±0.05	B-V-magnitude	0.01
U-magnitude	2.99 ±0.05	U-B-magnitude	-0.01

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	6.5 arcsec
magnitude difference between brightest and second brightest component	9
position angle	53 °

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: 19h 3min 6.648sec	DEC: +13° 47' 15.86''	±0.003 arcsec
position (J2000)	RA: 19h 5min 24.611sec	DEC: +13° 51' 48.44''
proper motion B1950 (FK4)	RA: -0.0005 arcsec/a	DEC: -0.095 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0004 arcsec/a	DEC: -0.096 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	3 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	A0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 716
Durchmusterung	BD+13 3899
Boss General Catalogue	26270
Henry Draper Catalogue	177724

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

position and proper motion:

position (J2000)	RA: 19h 5.4min	DEC: +13° 52'
proper motion (J2000)	RA: -0.005 arcsec/a	DEC: -0.096 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	1878	15	60°	4.9''	2.99	12	A0Vn	BU 287
AB	1934	15	53°	6.5''	2.99	12	A0Vn	BU 287
AC	1879	3	77°	156.6''	3	11.8	-	BU 287
AC	1988	3	-	160.8''	3	11.8	-	BU 287
AD	1988	1	151°	202.3''	3	10	-	POP

discoverer information:

discoverer code	discoverer	reference
BU 287	Burnham, S.W.	-
POP	Popovic, G.

notes:

note	Zeta Aql. A is a spectroscopic binary.

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

position:

position (equinox 1950.0)

RA: 19h 3min 6.6sec

DEC: +13° 47' 16''

variability informations:

magnitute at max. brightness	2.98
magnitute at min. brightness	2.99
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

references

to a study

660820D (designation: BS 7235)

miscanellous

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

catalogues and names	Deneb el Okab, z Aql, NSV 11724, 17 Aql, HR 7235, HD 177724, SAO 104461, BD +13 3899, FK5: 716, WDS 19054+1352A
constellation	Aquila