a Lupi

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 a Lup, alf Lup, HR 5469, HD 129056, SAO 225128, FK5: 541, WDS 14420-4724
constellation Lupus

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

position, motion, parallax:

position (J2000) RA: 14h 41min 55,8sec DEC: -47 23' 18''
position (J1900) RA: 14h 35min 16,5sec DEC: -46 57' 32''
proper motion (J2000) RA: -0,021 arcsec/a DEC: -0,018 arcsec/a
radial velocity 5 km/s
note: spectroscopic binaries
rotational velocity 24 km/s (uncertain) (variable)


visual magnitude 2,3
(V on UBV Johnson system)

spectral / color information

spectral class B1.5III/Vn
B-V-magnitude -0,2
U-B-magnitude -0,89
R-I-magnitude -0,17
note (category: spectra): Also classified B1.5Vn. Soft X-ray source.

variability information

variable star identification Alp Lup
note (category: variability): Beta C 2.29 - 2.34V, 0.2598466d. Period varies. Possible secondary period 3.145d. Modulation period 10y?

double/multiple star system information

separation 27,6 arcsec
mag difference (of double or brightest multiple) 11,1
note Worley (1978) update of the IDS

miscellaneous information

note (category: group membership): Sco-Cen assoc.; certain member of the Sco-Cen cluster; upper Cen group of Sco-Cen assoc.

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

position, motion, parallax:

position (J2000) RA: 14h 41min 55,768sec DEC: -47 23' 17,51'' 0,06 arcsec source: 15
proper motion (J2000) RA: -0,0021 arcsec/a DEC: -0,018 arcsec/a source: 25
radial velocity 5 km/s source: 25
galactic coord. (B1950) longitude: 321,62 latitude: 11,44
GCI unit vector (J2000) X: -0,514951 Y: -0,439536 Z: -0,735958


visual 2,3 (observed) source: 25
photovisual 2,9 source: 2
photographic 2,7 source: 2

spectral information:

spectral class B2 source: 96
Morgan-Keenan B1.5III/Vn source: 25
B-magnitude 2,1 0,05 B-V-magnitude -0,2
U-magnitude 1,21 0,05 U-B-magnitude -0,89

variability information:

source of data: 30
variability type 140
var. amplitude 0,05
var. period 0,26
var. epoch 2437418
28. April 1961, 12:00:00 UT
next max light 2451621,28
17. March 2000, 18:43:12 UT

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 27,6 arcsec
magnitude difference between brightest and second brightest component 11,7
position angle 232


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
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
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 38min 35,53sec DEC: -47 10' 29,32'' 0,01 arcsec
position (J2000) RA: 14h 41min 55,798sec DEC: -47 23' 17,4''
proper motion J1950 (FK4) RA: -0,0017 arcsec/a DEC: -0,02 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0017 arcsec/a DEC: -0,017 arcsec/a
source of proper motion data Determined by source catalog


visual 2,9 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class B2
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.


source catalogue FK4, catalogue number: 541
Durchmusterung CD-46 9501
Boss General Catalogue 19774
Henry Draper Catalogue 129056

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


position (J1950) RA: 14h 38min 35,5sec DEC: -47 10' 29''

variability informations:

variability type BCEP pulsating variable star
magnitute at max. brightness 2,29
magnitute at min. brightness 2,34
photometric system visual, photovisual or Johnson's V
epoch for maximum light [JD] 2437418,395
28. April 1961, 21:28:48 UT
period [d] 0,2598466
next maximum light [JD] 2451621,3503094
17. March 2000, 20:24:27 UT

spectral information

spectral class B1.5III


to a study Vol. II GCVS
to a chart/photograph no chart is avaible, but the star is contained in the 'Cordoba Durchmusterung'


ID in the GCVS catalogue 50/9001
constellation Lupus
notes on existence The star is equivalent to '0509004 del'.
There are notes in published catalog.

variability type description

variability type description
BCEP Variables of the Beta Cephei type (Beta Cep, Beta CMa), which are pulsating O8-B6 I-V stars with periods of light and radial-velocity variations in the range of 0.1 - 0.6 days and light amplitudes from 0.01 to 0.3 mag in V. The light curves are similar in shape to average radial-velocity curves but lag in phase by a quarter of the period, so that maximum brightness corresponds to
maximum contraction, i.e., to minimum stellar radius. The majority of these stars probably show radial pulsations, but some (V649 Per) display nonradial pulsations; multiperiodicity is characteristic of many of these stars.