x Bootis

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

  5. 4th Catalog of Orbits of Visual Binaries

  6. Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names x Boo, ksi Boo, 37 Boo, HR 5544, HD 131156, SAO 101250, WDS 14514+1906A
constellation Bootes

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

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

position, motion, parallax:

position (J2000) RA: 14h 51min 23,3sec DEC: +19 6' 4''
position (J1900) RA: 14h 46min 46,4sec DEC: +19 30' 57''
proper motion (J2000) RA: 0,137 arcsec/a DEC: -0,098 arcsec/a
radial velocity 3 km/s
note: suspected variable radial velocity
rotational velocity 3 km/s (uncertain) (variable)
trigonometric parallax 0,156 arcsec
note (category: radial and/or rotational velocities): ADS 9413B, K4V, +5.5k/s, variable.
note (category: dynamical parallaxes): 0.151".


visual magnitude 4,55
(V on UBV Johnson system)

spectral / color information

spectral class G8Ve+K4Ve
B-V-magnitude 0,76
U-B-magnitude 0,28
R-I-magnitude 0,43
note (category: spectra): Also classified G7Ve + K5Ve, H and K in emission.

variability information

variable star identification Xi Boo
note (category: variability): BY? 4.52 - 4.67V, 10.137d.

double/multiple star system information

number of components of multiple star system 4
separation 7,2 arcsec
mag difference (of double or brightest multiple) 2,1
component ID AB
note (category: double and multiple data): AB 4.74 G8V, 6.9 K4V, 151.505y, a = 4.904". Combined mag., colors. Masses 0.89 and 0.74 solar. Perturbation period 2.2y, a = 0.020" suspected; unresolved by speckle interferometry. Component C optical.

miscellaneous information

note (category: group membership): UMa stream.

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

position, motion, parallax:

position (J2000) RA: 14h 51min 23,379sec DEC: +19 6' 1,13'' 0,2 arcsec source: 52
proper motion (J2000) RA: 0,0116 arcsec/a DEC: -0,125 arcsec/a source: 25
radial velocity 3 km/s source: 25
trigonometric parallax 0,156 0,016 arcsec source: 25
galactic coord. (B1950) longitude: 23,09 latitude: 61,36
GCI unit vector (J2000) X: -0,692804 Y: -0,64261 Z: 0,327223


visual 4,5 (observed) source: 31
photovisual 4,6 source: 2
photographic 5,2 source: 16

spectral information:

spectral class G5 source: 96
Morgan-Keenan G8Ve+K4Ve source: 25
B-magnitude 5,31 0,05 B-V-magnitude 0,76
U-magnitude 5,59 0,05 U-B-magnitude 0,28

variability information:

source of data: 30
variability type 440
var. amplitude 0,15
var. period 10,14

double/multiple star system information:

source of data: 19
magnitude difference between brightest and second brightest component 2,25


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
16 PPM North and PPM South Catalogs and PPM Supplement
Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993
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
30 GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
31 CRM' (non-GCVS variable data)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994
52 PPMN-HP subset
PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H)
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: 14h 49min 4,784sec DEC: +19 18' 27'' 0,012 arcsec
position (J2000) RA: 14h 51min 23,298sec DEC: +19 6' 3,96''
proper motion J1950 (FK4) RA: 0,0096 arcsec/a DEC: -0,103 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0097 arcsec/a DEC: -0,098 arcsec/a
source of proper motion data Determined by source catalog


visual 4,6 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class G5
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Double star in Aitken's Double Star Catalogue (Aitken 1932)


source catalogue GC, catalogue number: 19991
Durchmusterung BD+19 2870
Boss General Catalogue 19991
Henry Draper Catalogue 131156

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

position and proper motion:

position (J2000) RA: 14h 51,4min DEC: +19 6'
proper motion (J2000) RA: 0,159 arcsec/a DEC: -0,136 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
AB 1822 often '' 4,72 6,97 G8V K5V STF1888
AC 1900 6 353 59,2'' 4,6 12,6 - STF1888
1953 348 66,7''
AD 1907 4 284 141,3'' 4,6 9,6 - STF1888
1953 286 148,9''
BC 1921 4 101 282,2'' 6,7 12,6 K5V STF1888

discoverer information:

discoverer code discoverer reference
STF1888 Struve, F.G.W. -


note Xi Boo. P = 151.5yr., a = 4.90", motion retrograde.

data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)


position (J1900) RA: 14h 46,8min DEC: +19 31'

magnitudes, spectral classes, orbital elements:

author: R. Wielen
magnitude of component A: 4,74
magnitude of component B: 4,74
spectral class component B: G8V
spectral class component B: G8V
period [y]: 151,505
semi-major axis [arcsec]: 4,904
inclination [deg]: 140,04
node [deg]: 348,1 (ascending)
equinox of node: 2000
eccentricity: 0,512
time of periastron passage: 1909,361
grade: definitive
reference: Astron. J. 67, 602; 1962. Orbit 3.
notes The RV difference is small and renders identification of the ascending node uncertain.