xi Aquarii

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

position, motion, parallax:

position (J2000)	RA: 21h 37min 45.1sec	DEC: -7° 51' 15''
position (B1900)	RA: 21h 32min 25.7sec	DEC: -8° 18' 10''
proper motion (J2000)	RA: 0.116 arcsec/a	DEC: -0.025 arcsec/a
radial velocity	-21 km/s note: spectroscopic binaries note: orbital data avaible
rotational velocity	154 km/s (uncertain) (variable)
trigonometric parallax	0.012 arcsec
galactic coordinates	longitude: 46.45°	latitude: -40.34°

magnitude

visual magnitude

4.69
(V on UBV Johnson system)

spectral / color information

double/multiple star system information

separation	0.1 arcsec
mag difference (of double or brightest multiple)	2
note	doublicity discoverd by speckle interferometry

note (category: double and multiple data):

Speckle interferometry indicates mag. diff 3.0, sep. 0.033"; D. W. Dunham gives 5.1, 7.1v, 0.07".

note (category: spectroscopic binaries):

8016d, K 11.3k/s, V0 -21.0k/s, asini 1050. Massive invisible component.

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

position, motion, parallax:

magnitude:

spectral information:

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	0 arcsec
position angle	123 °

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: 21h 35min 5.459sec	DEC: -8° 4' 45.93''	±0.004 arcsec
position (J2000)	RA: 21h 37min 45.112sec	DEC: -7° 51' 15.24''
proper motion B1950 (FK4)	RA: 0.0076 arcsec/a	DEC: -0.023 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0078 arcsec/a	DEC: -0.025 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.8 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	A5
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

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

position and proper motion:

position (J2000)	RA: 21h 37.8min	DEC: -7° 51'
proper motion (J2000)	RA: 0.116 arcsec/a	DEC: -0.025 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
-	1977	1	123°	0''	4.7	-	A7V	MCA 68

discoverer information:

discoverer code	discoverer	reference
MCA 68	McAlister, H.A.	-

notes:

note	Xi Aqr. A long-period spectroscopic binary now resolved by speckle interferometry. Also an occultation pair.

catalogues and names	x Aqr, 23 Aqr, HR 8264, HD 205767, SAO 145537, BD -8 5701, FK5: 1569, WDS 21378-0751
constellation	Aquarius