theta Herculis

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

position, motion, parallax:

position (J2000)	RA: 17h 56min 15.2sec	DEC: +37° 15' 2''
position (B1900)	RA: 17h 52min 49.3sec	DEC: +37° 15' 49''
proper motion (J2000)	RA: 0.004 arcsec/a	DEC: 0.006 arcsec/a
radial velocity	-27 km/s note: variable radial velocity
rotational velocity	<19 km/s
trigonometric parallax	0.002 arcsec
galactic coordinates	longitude: 63.26°	latitude: 26.42°

magnitude

visual magnitude

3.86
(V on UBV Johnson system)

spectral / color information

spectral class	K1IIaCN+2
B-V-magnitude	1.35
U-B-magnitude	1.46
R-I-magnitude
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

variability information

variable star identification

9890

note (category: variability):

Possibly 5 yr. period in He 10830 emission.

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

position, motion, parallax:

magnitude:

visual	3.86 (observed)	source: 25
photovisual	4	source: 2

spectral information:

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: 17h 54min 32.183sec	DEC: +37° 15' 21.68''	±0.005 arcsec
position (J2000)	RA: 17h 56min 15.194sec	DEC: +37° 15' 1.96''
proper motion B1950 (FK4)	RA: 0.0001 arcsec/a	DEC: 0.006 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0005 arcsec/a	DEC: 0.007 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	K0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

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

position:

position (equinox 1950.0)

RA: 17h 54min 32.2sec

DEC: +37° 15' 22''

variability informations:

magnitute at max. brightness	3.82
magnitute at min. brightness	3.87
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

references

to a study

352238D (designation: THETA HER)

miscanellous

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

catalogues and names	q Her, NSV 09890, 91 Her, HR 6695, HD 163770, SAO 66485, BD +37 2982, FK5: 672
constellation	Hercules