Zuben Elakribi

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

note (category: star names):

Zuben Elakribi.

position, motion, parallax:

position (J2000)	RA: 15h 0min 58.4sec	DEC: -8° 31' 8''
position (2000.73)	RA: 15h 1min 0sec	DEC: -8° 31' 18''
position (B1900)	RA: 14h 55min 37.7sec	DEC: -8° 7' 20''
proper motion (J2000)	RA: -0.063 arcsec/a	DEC: -0.005 arcsec/a
radial velocity	-39 km/s note: spectroscopic binaries note: orbital data avaible
rotational velocity	77 km/s (uncertain) (variable)
trigonometric parallax	0.02 arcsec
galactic coordinates	longitude: 348.87°	latitude: 42.51°

magnitude

visual magnitude

4.92
(V on UBV Johnson system)

spectral / color information

spectral class	B9.5V
B-V-magnitude	0
U-B-magnitude	-0.1
R-I-magnitude

variability information

variable star identification

Del Lib

note (category: variability):

EA 4.92 - 5.90V, 2.32735297d, period may vary. Component A of quadruple system. Contact binary.

double/multiple star system information

number of components of multiple star system	4
separation	106.3 arcsec
mag difference (of double or brightest multiple)	6.4
component ID	AC
note	Worley (1978) update of the IDS

note (category: spectroscopic binaries):

2.3273d, K 78.3k/s, V0 -36.4k/s, asini 2.50. Orbital period variable. Masses 2.6, 1.1 solar.

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

position, motion, parallax:

position (J2000)	RA: 15h 0min 58.354sec	DEC: -8° 31' 8.28''	ą0.06 arcsec	source: 15
position (2000.73)	RA: 15h 1min 0sec	DEC: -8° 31' 18''	JD: 2451810.11
proper motion (J2000)	RA: -0.0043 arcsec/a	DEC: -0.005 arcsec/a		source: 25
radial velocity	-39 km/s			source: 25
trigonometric parallax	0.02 arcsec		ą0.002 arcsec	source: 25
galactic coord. (B1950)	longitude: 348.87°	latitude: 42.51°

magnitude:

visual

4.9 (observed)

source: 31

spectral information:

spectral class	A0		source: 96
Morgan-Keenan	B9.5V		source: 25
B-magnitude	4.92 ą0.05	B-V-magnitude	0
U-magnitude	4.82 ą0.05	U-B-magnitude	-0.1

variability information:

source of data: 30

variability type	10
var. amplitude	0.99
var. period	2.33
var. epoch	2442961 1. July 1976, 12:00:00 UT
next max light	2451810.34 22. September 2000, 20:09:36 UT

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	67 arcsec
magnitude difference between brightest and second brightest component	7.2
position angle	90 °

sources:

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
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
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: 14h 58min 17.808sec	DEC: -8° 19' 18.19''	ą0.005 arcsec
position (2000.73)	RA: 15h 1min 1sec	DEC: -8° 31' 18''	JD: 2451810.11
position (J2000)	RA: 15h 0min 58.353sec	DEC: -8° 31' 8.27''
proper motion B1950 (FK4)	RA: -0.0045 arcsec/a	DEC: -0.009 arcsec/a	ą0.001 arcsec/a in RA ą0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0043 arcsec/a	DEC: -0.005 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5.4 (accuracy: 2 decimals)
source of visual magnitude data	Arithmetic mean of maximum and minimum magnitudes of a variable star

spectral information:

spectral class	A0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Variable star in visual magnitude in source catalog

catalogues

source catalogue	FK4, catalogue number: 1394
Durchmusterung	BD-07 3938
Boss General Catalogue	20195
Henry Draper Catalogue	132742

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

position and proper motion:

position (J2000)	RA: 15h 1min	DEC: -8° 31'
proper motion (J2000)	RA: -0.063 arcsec/a	DEC: -0.005 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	1950	1	90°	67''	4.92	12.1	B9.5V	J 1586
AC	1950	1	173°	106.3''	4.92	11.3	-	J 1586
CD	1950	1	351°	9.3''	11.3	13.7	-	J 1586

discoverer information:

discoverer code	discoverer	reference
J 1586	Jonckheere, R.	-

notes:

note	Delta Lib. A is an Algol-type system.

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)

position:

position (equinox 1950.0)

RA: 14h 58min 17.8sec

DEC: -8° 19' 18''

variability informations:

variability type	EA/SD	close binary eclipsing system
magnitute at max. brightness	4.91
magnitute at min. brightness	5.9
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2442960.6994 1. July 1976, 04:47:08 UT
period [d]	2.3273543
next maximum light [JD]	2451811.6278029 24. September 2000, 03:04:02 UT
duration of the eclipse	23 % of period the duration of the light constancy phase at minimum light is equal to zero

spectral information

spectral class

A0IV-V

references

to a study	the main characteristics of the star was determined by the authors themselves
to a chart/photograph	Vol. I GCVS (see Kholopov et al. 1985-1988)

miscanellous

ID in the GCVS catalogue	49/9004
constellation	Libra
notes on existence	The star is equivalent to '0499011 lam'.
There are notes in published catalog.

variability type description

variability type	description
EA	Eclipsing binary systems. These are binary systems with orbital planes so close to the observer's line of sight (the inclination i of the orbital plane to the plane orthogonal to the line of sight is close to 90 deg) that the components periodically eclipse each other. Consequently, the observer finds changes of the apparent combined brightness of the system with the period coincident with that of the components' orbital motion. EA Algol (Beta Persei)-type eclipsing systems. Binaries with spherical or slightly ellipsoidal components. It is possible to specify, for their light curves, the moments of the beginning and end of the eclipses. Between eclipses the light remains almost constant or varies insignificantly because of reflection effects, slight ellipsoidality of components, or physical variations. Secondary minima may be absent. An extremely wide range of periods is observed, from 0.2 to >= 10000 days. Light amplitudes are also quite different and may reach several magnitudes. EB Beta Lyrae-type eclipsing systems. These are eclipsing systems having ellipsoidal components and light curves for which it is impossible to specify the exact times of onset and end of eclipses because of a continuous change of a system's apparent combined brightness between eclipses; secondary minimum is observed in all cases, its depth usually being considerably smaller than that of the primary minimum; periods are mainly longer than 1 day. The components generally belong to early spectral types (B-A). Light amplitudes are usually <2 mag in V. EW W Ursae Majoris-type eclipsing variables. These are eclipsers with periods shorter than 1 days, consisting of ellipsoidal components almost in contact and having light curves for which it is impossible to specify the exact times of onset and end of eclipses. The depths of the primary and secondary minima are almost equal or differ insignificantly. Light amplitudes are usually <0.8 mag in V. The components generally belong to spectral types F-G and later.
SD	Semidetached systems in which the surface of the less massive component is close to its inner Roche lobe.

catalogues and names	Zuben Elakribi, d Lib, del Lib, 19 Lib, HR 5586, HD 132742, SAO 140270, BD -7 3938, FK5: 1394, WDS 15010-0831A
constellation	Libra