The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. Combined General Catalogue of Variable Stars (suspected variables)

catalogues and names Rasalhague, a Oph, NSV 09189, 55 Oph, HR 6556, HD 159561, SAO 102932, FK5: 656
other names Ras Alhague
constellation Ophiuchus

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

note (category: star names): RASALHAGUE; Ras Alhague.

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

position, motion, parallax:

position (J2000) RA: 17h 34min 56,1sec DEC: +12 33' 36''
position (J1900) RA: 17h 30min 17,5sec DEC: +12 37' 58''
proper motion (J2000) RA: 0,12 arcsec/a DEC: -0,226 arcsec/a
radial velocity 13 km/s
note: spectroscopic binaries
rotational velocity 219 km/s (uncertain) (variable)
trigonometric parallax 0,067 arcsec


visual magnitude 2,08
(V on UBV Johnson system)

spectral / color information

spectral class A5III
B-V-magnitude 0,15
U-B-magnitude 0,1
R-I-magnitude 0,08
note (category: spectra): Interstellar CaII lines indicate a cloud of about 1 pc depth in front of Alpha Oph.

variability information

variable star identification 9189
note (category: variability): Delta Sct?

double/multiple star system information

separation 0,1 arcsec
note astrometric binary
note (category: double and multiple data): A* 2.08 A5III, 8.5y, a = 0.065". Resolved by speckle interferometry.

miscellaneous information

note (category: group membership): UMa stream; Sirius group.
note (category: stellar radii or diameters): Diam. = 0.00153 - 0.00163".

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

position, motion, parallax:

position (J2000) RA: 17h 34min 56,076sec DEC: +12 33' 36,14'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0082 arcsec/a DEC: -0,226 arcsec/a source: 25
radial velocity 13 km/s source: 25
trigonometric parallax 0,065 0,006 arcsec source: 25
galactic coord. (B1950) longitude: 35,9 latitude: 22,57
GCI unit vector (J2000) X: -0,106538 Y: -0,970237 Z: 0,217463


visual 2,08 (observed) source: 25
photovisual 2,1 source: 2

spectral information:

spectral class A5 source: 96
Morgan-Keenan A5III source: 25
B-magnitude 2,23 0,05 B-V-magnitude 0,15
U-magnitude 2,33 0,05 U-B-magnitude 0,1

double/multiple star system information:

source of data: 25
separation between brightest and second brightest component 0,1 arcsec


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 (J1950) RA: 17h 32min 36,696sec DEC: +12 35' 41,92'' 0,003 arcsec
position (J2000) RA: 17h 34min 56,075sec DEC: +12 33' 36,21''
proper motion J1950 (FK4) RA: 0,008 arcsec/a DEC: -0,227 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0082 arcsec/a DEC: -0,226 arcsec/a
source of proper motion data Determined by source catalog


visual 2,1 (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.


source catalogue FK4, catalogue number: 656
Durchmusterung BD+12 3252
Boss General Catalogue 23837
Henry Draper Catalogue 159561

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


position (J1950) RA: 17h 32min 36,7sec DEC: +12 35' 42''

variability informations:

magnitute at max. brightness 2,02
magnitute at min. brightness 2,13
photometric system visual, photovisual or Johnson's V

spectral information

spectral class A5


to a study 140098D (designation: ALPHA OPH)


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