theta Arae

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

position, motion, parallax:

position (J2000)	RA: 18h 6min 37.9sec	DEC: -50° 5' 30''
position (B1900)	RA: 17h 58min 50.7sec	DEC: -50° 5' 52''
proper motion (J2000)	RA: -0.01 arcsec/a	DEC: -0.014 arcsec/a
radial velocity	3 km/s
rotational velocity	117 km/s (uncertain) (variable)
galactic coordinates	longitude: 343.33°	latitude: -13.82°

magnitude

visual magnitude

3.66
(V on UBV Johnson system)

spectral / color information

spectral class	B2Ib
B-V-magnitude	-0.08
U-B-magnitude	-0.85

miscellaneous information

note (category: group membership):

Listed by Buscombe and Morris (M.N.R.A.S. 121, 268, 1960) and by Buscombe and Kennedy (M.N.R.A.S. 124, 196, 1962) among Sco-Cen stars. Buscombe now rejects membership, while Eggen (ApJ, 188, 59, 1974) includes it as a member of the Pleiades group.

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

position, motion, parallax:

position (J2000)	RA: 18h 6min 37.864sec	DEC: -50° 5' 29.57''	±0.06 arcsec	source: 15
proper motion (J2000)	RA: -0.001 arcsec/a	DEC: -0.014 arcsec/a		source: 25
radial velocity	3 km/s			source: 25
galactic coord. (B1950)	longitude: 343.33°	latitude: -13.82°

magnitude:

visual	3.66 (observed)	source: 25
photovisual	3.9	source: 2
photographic	3.7	source: 2

spectral information:

spectral class	B1		source: 96
Morgan-Keenan	B2Ib		source: 25
B-magnitude	3.58 ±0.05	B-V-magnitude	-0.08
U-magnitude	2.73 ±0.05	U-B-magnitude	-0.85

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
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: 18h 2min 44.229sec	DEC: -50° 5' 49.54''	±0.011 arcsec
position (J2000)	RA: 18h 6min 37.836sec	DEC: -50° 5' 30.04''
proper motion B1950 (FK4)	RA: -0.0011 arcsec/a	DEC: -0.017 arcsec/a	±0.003 arcsec/a in RA ±0.003 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0013 arcsec/a	DEC: -0.019 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	3.9 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	B1p
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 1471
Durchmusterung	CD-5011720
Boss General Catalogue	24635
Henry Draper Catalogue	165024

catalogues and names	q Ara, HR 6743, HD 165024, SAO 245242, CD -50 11720, FK5: 1471
constellation	Ara