FX Lib

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 (Vol. I-III)

catalogues and names FX Lib, 48 Lib, HR 5941, HD 142983, SAO 159607, FK5: 1417
constellation Libra

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

position, motion, parallax:

position (J2000) RA: 15h 58min 11,4sec DEC: -14 16' 46''
position (J1900) RA: 15h 52min 35,2sec DEC: -13 59' 27''
proper motion (J2000) RA: -0,012 arcsec/a DEC: -0,015 arcsec/a
radial velocity -6 km/s
note: spectroscopic binaries
rotational velocity 393 km/s (uncertain) (variable)
note (category: radial and/or rotational velocities): Shell oscillations. Unstable circumstellar shell expanding -25k/s. RV has quasi period of about 10 yrs, amp. about 200k/s.


visual magnitude 4,88
(V on UBV Johnson system)

spectral / color information

spectral class B5IIIp
B-V-magnitude -0,1
U-B-magnitude -0,2
R-I-magnitude -0,03
note (category: spectra): Strong Lambda 4619 absorption. Shell star with variable hydrogen emission profiles. Also classified B3:IV:e-shell.

variability information

variable star identification FX Lib
note (category: variability): Gamma Cas 4.79 - 4.96V. Variable polarization. R-I also found at -0.13.

miscellaneous information

note (category: group membership): Sco-Cen assoc.; probable member of Sco-Cen cluster; member of Pleiades group.

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

position, motion, parallax:

position (J2000) RA: 15h 58min 11,374sec DEC: -14 16' 45,73'' 0,06 arcsec source: 15
proper motion (J2000) RA: -0,0008 arcsec/a DEC: -0,015 arcsec/a source: 25
radial velocity -6 km/s source: 25
galactic coord. (B1950) longitude: 356,39 latitude: 28,63
GCI unit vector (J2000) X: -0,491167 Y: -0,835415 Z: -0,24665


visual 4,7 (observed) source: 31
photovisual 4,7 source: 2
photographic 4,5 source: 2

spectral information:

spectral class B3 source: 96
Morgan-Keenan B5IIIp source: 25
B-magnitude 4,78 0,05 B-V-magnitude -0,1
U-magnitude 4,58 0,05 U-B-magnitude -0,2

variability information:

source of data: 30
variability type 264
var. amplitude 0,22


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
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 (J1950) RA: 15h 55min 23,102sec DEC: -14 8' 11,73'' 0,007 arcsec
position (J2000) RA: 15h 58min 11,374sec DEC: -14 16' 45,74''
proper motion J1950 (FK4) RA: -0,001 arcsec/a DEC: -0,019 arcsec/a 0,002 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0008 arcsec/a DEC: -0,015 arcsec/a
source of proper motion data Determined by source catalog


visual 4,7 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class B3p
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.


source catalogue FK4, catalogue number: 1417
Durchmusterung BD-13 4302
Boss General Catalogue 21439
Henry Draper Catalogue 142983

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


position (J1950) RA: 15h 55min 23,1sec DEC: -14 8' 12''

variability informations:

variability type GCAS eruptive variable star
magnitute at max. brightness 4,74
magnitute at min. brightness 4,96
photometric system visual, photovisual or Johnson's V

spectral information

spectral class B5IIIpe


to a study Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'


ID in the GCVS catalogue 49/187
constellation Libra
notes on existence The star is equivalent to '0490188 FY'.
There are notes in published catalog.

variability type description

variability type description
GCAS Eruptive irregular variables of the Gamma Cas type. These are rapidly rotating B III-IVe stars with mass outflow from their equatorial zones.
The formation of equatorial rings or disks is often accompanied by temporary fading. Light amplitudes may reach 1.5 mag in V.