lambda Librae

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

position, motion, parallax:

position (J2000)	RA: 15h 53min 20.1sec	DEC: -20° 10' 2''
position (B1900)	RA: 15h 47min 31.6sec	DEC: -19° 52' 5''
proper motion (J2000)	RA: -0.011 arcsec/a	DEC: -0.023 arcsec/a
radial velocity	6 km/s note: spectroscopic binaries
rotational velocity	197 km/s (uncertain) (variable)
galactic coordinates	longitude: 350.72°	latitude: 25.38°

magnitude

visual magnitude

5.03
(V on UBV Johnson system)

spectral / color information

double/multiple star system information

separation	0 arcsec
mag difference (of double or brightest multiple)	2

note (category: spectroscopic binaries):

5.3, 7.3v, sep. 0.0002", about 11.5d.

miscellaneous information

note (category: group membership):

Sco OB2; doubtful member of the Sco-Cen cluster.

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

position, motion, parallax:

magnitude:

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: 15h 50min 25.602sec	DEC: -20° 1' 8.7''	±0.006 arcsec
position (J2000)	RA: 15h 53min 20.066sec	DEC: -20° 10' 1.5''
proper motion B1950 (FK4)	RA: -0.0008 arcsec/a	DEC: -0.027 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0007 arcsec/a	DEC: -0.024 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5.1 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	B3
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 (Vol. I-III) (Kholopov+ 1998)

position:

position (equinox 1950.0)

RA: 15h 50min 25.6sec

DEC: -20° 1' 9''

variability informations:

variability type	ELL	rotating variable star
magnitute at max. brightness	5.03
magnitute amplitude	0.02
photometric system	visual, photovisual or Johnson's V

references

to a study	M.Jerzykiewicz, AsAp Suppl 97, No.2, 421, 1993.
to a chart/photograph

miscanellous

variability type description

variability type	description
ELL	Rotating ellipsoidal variables (b Per, Alpha Vir). These are close binary systems with ellipsoidal components, which change combined brightnesses with periods equal to those of orbital motion because of changes in emitting areas toward an observer, but showing no eclipses. Light amplitudes do not exceed 0.1 mag in V.

catalogues and names	l Lib, lam Lib, 45 Lib, HR 5902, HD 142096, SAO 183895, BD -19 4249, FK5: 1415
constellation	Libra