theta Aquilae

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

position, motion, parallax:

position (J2000)	RA: 20h 11min 18.3sec	DEC: -0° 49' 17''
position (B1900)	RA: 20h 6min 8.7sec	DEC: -1° 7' 6''
proper motion (J2000)	RA: 0.038 arcsec/a	DEC: 0.004 arcsec/a
radial velocity	-27 km/s note: spectroscopic binaries, double lined spectra note: orbital data avaible
rotational velocity	63 km/s (uncertain) (variable)
trigonometric parallax	0.012 arcsec
galactic coordinates	longitude: 41.58°	latitude: -18.08°

magnitude

visual magnitude

3.23
(V on UBV Johnson system)

spectral / color information

spectral class	B9.5III
B-V-magnitude	-0.07
U-B-magnitude	-0.14
R-I-magnitude
IR-note	object is infrared source (Engels et al., 1982)

double/multiple star system information

separation	113.7 arcsec
mag difference (of double or brightest multiple)	9.6
note	Worley (1978) update of the IDS

note (category: spectroscopic binaries):

17.1243d, K 51.0k/s, V0 -27.9k/s, msin3i 0.742, asini 9.52.

miscellaneous information

note (category: group membership):

In reflection nebula.

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

position, motion, parallax:

magnitude:

visual	3.23 (observed)	source: 25
photovisual	3.4	source: 2

spectral information:

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	1 arcsec
position angle	44 °

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: 20h 8min 43.494sec	DEC: -0° 58' 16.06''	±0.003 arcsec
position (J2000)	RA: 20h 11min 18.288sec	DEC: -0° 49' 17.27''
proper motion B1950 (FK4)	RA: 0.0024 arcsec/a	DEC: 0.007 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0026 arcsec/a	DEC: 0.005 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	3.4 (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

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

position and proper motion:

position (J2000)	RA: 20h 11.3min	DEC: -0° 49'
proper motion (J2000)	RA: 0.038 arcsec/a	DEC: 0.004 arcsec/a

double/multiple star system information:

discoverer information:

notes:

note	Theta Aql. A is a spectroscopic binary, P = 17.12d. The Aa pair cannot be this object. Aa-B is H VI 27.

catalogues and names	q Aql, NSV 25032, 65 Aql, HR 7710, HD 191692, SAO 144150, BD -1 3911, FK5: 756, WDS 20113-0049
constellation	Aquila