Zuben Elakrab


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. The Washington Visual Double Star Catalog, 1996.0


catalogues and names Zuben Elakrab, g Lib, 38 Lib, HR 5787, HD 138905, SAO 159370, FK5: 577, WDS 15355-1447A
other names Zuben Hakraki, Zuben el Hakrabi
constellation Libra

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

note (category: star names): Zuben Elakrab; Zuben Hakraki; Zuben el Hakrabi.

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

position, motion, parallax:

position (J2000) RA: 15h 35min 31,6sec DEC: -14 47' 22''
position (J1900) RA: 15h 29min 55,8sec DEC: -14 27' 22''
proper motion (J2000) RA: 0,065 arcsec/a DEC: 0,009 arcsec/a
radial velocity -28 km/s
note: variable radial velocity
rotational velocity <17 km/s (uncertain) (variable)
trigonometric parallax 0,041 arcsec

magnitude

visual magnitude 3,91
(V on UBV Johnson system)

spectral / color information

spectral class G8.5III
B-V-magnitude 1,01
U-B-magnitude 0,74
R-I-magnitude 0,55

double/multiple star system information

number of components of multiple star system 3
separation 0,1 arcsec
mag difference (of double or brightest multiple) 0,2
component ID AP
note (category: double and multiple data): ADS 9704 AP, sep. 0.097", unresolved by speckle interferometry. Component B, 11.2v at 42", optical.

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

position, motion, parallax:

position (J2000) RA: 15h 35min 31,579sec DEC: -14 47' 22,4'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0044 arcsec/a DEC: 0,009 arcsec/a source: 25
radial velocity -28 km/s source: 25
trigonometric parallax 0,041 0,004 arcsec source: 25
galactic coord. (B1950) longitude: 351,52 latitude: 32,2
GCI unit vector (J2000) X: -0,569927 Y: -0,781038 Z: -0,25527

magnitude:

visual 3,91 (observed) source: 25
photovisual 4 source: 2
photographic 5 source: 2

spectral information:

spectral class K0 source: 96
Morgan-Keenan G8.5III source: 25
B-magnitude 4,92 0,05 B-V-magnitude 1,01
U-magnitude 5,66 0,05 U-B-magnitude 0,74

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 0,1 arcsec
magnitude difference between brightest and second brightest component 0,2
position angle 191

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 (J1950) RA: 15h 32min 43,474sec DEC: -14 37' 27,13'' 0,004 arcsec
position (J2000) RA: 15h 35min 31,582sec DEC: -14 47' 22,5''
proper motion J1950 (FK4) RA: 0,0043 arcsec/a DEC: 0,003 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0045 arcsec/a DEC: 0,008 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

source catalogue FK4, catalogue number: 577
Durchmusterung BD-14 4237
Boss General Catalogue 20949
Henry Draper Catalogue 138905

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

position and proper motion:

position (J2000) RA: 15h 35,5min DEC: -14 47'
proper motion (J2000) RA: 0,065 arcsec/a DEC: 0,009 arcsec/a

double/multiple star system information:

component year number of measures position angle angular separation magnitude of 1st component magnitude of 2nd component spectral class(es) discoverer code
Aa 1937 2 61 0,1'' 4 4,2 G8III WRH 20
1940 191 -
Aa-B 1878 4 153 41,7'' 4 11,2 - GOL 1

discoverer information:

discoverer code discoverer reference
WRH 20 Wilson, R.H. -
GOL 1 Golimowski et al (Astron. J. 105, 1108; 1993.)

notes:

note Aa: Uncertain duplicity. Aa-B: Gamma Lib.