m Librae

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. Combined General Catalogue of Variable Stars (suspected variables)

catalogues and names m Lib, NSV 06816, 7 Lib, HR 5523, HD 130559, SAO 158821, WDS 14493-1409A
constellation Libra

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

position, motion, parallax:

position (J2000) RA: 14h 49min 19,1sec DEC: -14 8' 56''
position (J1900) RA: 14h 43min 50sec DEC: -13 43' 57''
proper motion (J2000) RA: -0,061 arcsec/a DEC: -0,014 arcsec/a
radial velocity -4 km/s
note: spectroscopic binaries
rotational velocity 26 km/s (uncertain) (variable)
trigonometric parallax 0,006 arcsec
note (category: dynamical parallaxes): 0.016".


visual magnitude 5,31
(V on UBV Johnson system)

spectral / color information

spectral class A1pSrCrEu
B-V-magnitude 0,07
U-B-magnitude -0,05
note (category: spectra): Also classified A0III:pSrCr,s.

variability information

variable star identification 6816
note (category: variability): ADS 9396AB, Alpha CV.

double/multiple star system information

number of components of multiple star system 5
separation 1,8 arcsec
mag difference (of double or brightest multiple) 0,9
component ID AB
note (category: double and multiple data): AB and AE binary. B = Am(A2/A6/A8)s. C and D optical. E 12.5v at 27".

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

position, motion, parallax:

position (J2000) RA: 14h 49min 19,04sec DEC: -14 8' 55,89'' 0,19 arcsec source: 16
proper motion (J2000) RA: -0,0046 arcsec/a DEC: -0,016 arcsec/a source: 25
radial velocity -4 km/s source: 25
trigonometric parallax 0,006 0,001 arcsec source: 25
galactic coord. (B1950) longitude: 341,31 latitude: 39,78
GCI unit vector (J2000) X: -0,716859 Y: -0,652963 Z: -0,244442


visual 5,31 (observed) source: 25
photovisual 5,8 source: 16
photographic 5,4 source: 2

spectral information:

spectral class A2 source: 96
Morgan-Keenan A1pSrCrEu source: 25
B-magnitude 5,38 0,05 B-V-magnitude 0,07
U-magnitude 5,33 0,05 U-B-magnitude -0,05

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 1,9 arcsec
magnitude difference between brightest and second brightest component 0,9
position angle 1


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
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 46min 34,325sec DEC: -13 56' 30,44'' 0,014 arcsec
position (J2000) RA: 14h 49min 19,074sec DEC: -14 8' 56,16''
proper motion J1950 (FK4) RA: -0,0044 arcsec/a DEC: -0,019 arcsec/a 0,003 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0042 arcsec/a DEC: -0,014 arcsec/a
source of proper motion data Determined by source catalog


visual 5,4 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class A2p
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: 19938
Durchmusterung BD-13 3986
Boss General Catalogue 19938
Henry Draper Catalogue 130559

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

position and proper motion:

position (J2000) RA: 14h 49,3min DEC: -14 9'
proper motion (J2000) RA: -0,066 arcsec/a DEC: -0,01 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 1875 76 335 1,4'' 5,8 6,7 A1pSrCrEu BU 106
1991 1 1,9''
AC 1889 4 283 18,2'' 5,4 14,5 - BU 106
1958 289 15''
AD 1889 4 185 26,1'' 5,4 13,9 - BU 106
1958 174 25''
AE 1878 6 232 27,3'' 5,4 12,5 - BU 106

discoverer information:

discoverer code discoverer reference
BU 106 Burnham, S.W. -


note Mu Lib.

data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)


position (J1950) RA: 14h 46min 34,3sec DEC: -13 56' 30''

variability informations:

variability type ACV rotating variable star
magnitute at max. brightness 5,32
magnitute at min. brightness
photometric system visual, photovisual or Johnson's V

spectral information

spectral class AP


to a study 691176D (designation: mu LIB)


There are notes in the published catalog (Kukarkin et al.(1982)).

variability type description

variability type description
Alpha2 Canum Venaticorum variables. These are main-sequence stars with spectral types B8p-A7p and displaying strong magnetic fields.
Spectra show abnormally strong lines of Si, Sr, Cr, and rare earths whose intensities vary with rotation. They exhibit magnetic field and brightness changes (periods of 0.5-160 days or more). The amplitudes of the brightness changes are usually withine 0.01-0.1 mag in V.

Rapidly oscillating Alpha2 CVn variables. These are nonradially pulsating, rotating magnetic variables of Ap spectral type (DO Eri). Pulsation periods are in the range of 6-12 mmag (0.004-0.01 days), while amplitudes of light variation caused by the pulsation are about 0.01 mag in V. The pulsational variations are superposed on those caused by rotation.