tau 1 Aquarii

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

note (category: star names):

Sometimes called Tau1 Aqr; usually no Greek letter. See HR 8679.

position, motion, parallax:

position (J2000)	RA: 22h 47min 42.8sec	DEC: -14° 3' 23''
position (B1900)	RA: 22h 42min 24.2sec	DEC: -14° 35' 1''
proper motion (J2000)	RA: 0.032 arcsec/a	DEC: -0.009 arcsec/a
radial velocity	15 km/s note: spectroscopic binaries
rotational velocity	71 km/s (uncertain) (variable)
galactic coordinates	longitude: 51.06°	latitude: -58.35°

magnitude

visual magnitude

5.66
(V on UBV Johnson system)

spectral / color information

double/multiple star system information

number of components of multiple star system	3
separation	23.7 arcsec
mag difference (of double or brightest multiple)	3.9
component ID	AB

note (category: double and multiple data):

AB optical.

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	22.6 arcsec
magnitude difference between brightest and second brightest component	3.3
position angle	122 °

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
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: 22h 45min 3.557sec	DEC: -14° 19' 13.84''	ą0.013 arcsec
position (J2000)	RA: 22h 47min 42.776sec	DEC: -14° 3' 23.2''
proper motion B1950 (FK4)	RA: 0.002 arcsec/a	DEC: -0.006 arcsec/a	ą0.002 arcsec/a in RA ą0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0022 arcsec/a	DEC: -0.009 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5.7 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	B9
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

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

position and proper motion:

position (J2000)	RA: 22h 47.7min	DEC: -14° 3'
proper motion (J2000)	RA: 0.033 arcsec/a	DEC: -0.009 arcsec/a

double/multiple star system information:

discoverer information:

notes:

note	Tau (1) Aqr. A is a spectroscopic binary. AB optical.

catalogues and names	t¹Aqr, 69 Aqr, HR 8673, HD 215766, SAO 165298, BD -14 6346, WDS 22477-1403
constellation	Aquarius