Agena

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 (Vol. I-III)

catalogues and names Agena, b Cen, bet Cen, HR 5267, HD 122451, SAO 252582, FK5: 518, WDS 14038-6022
other names Hadar
constellation Centaurus

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

note (category: star names): AGENA; HADAR.

position, motion, parallax:

position (J2000) RA: 14h 3min 49,4sec DEC: -60° 22' 23''
position (J1900) RA: 13h 56min 45,8sec DEC: -59° 53' 26''
proper motion (J2000) RA: -0,032 arcsec/a DEC: -0,019 arcsec/a
radial velocity 6 km/s
note: spectroscopic binaries
rotational velocity 139 km/s (uncertain) (variable)
trigonometric parallax 0,009 arcsec

magnitude

visual magnitude 0,61
(V on UBV Johnson system)

spectral / color information

spectral class B1III
B-V-magnitude -0,23
U-B-magnitude -0,98
note (category: spectra): Lyman alpha observed from COPERNICUS; spectra revealed MgII emission.
note (category: colors): Color excess E(B-V) = +0.02. Soft X-ray source.

variability information

variable star identification Bet Cen
note (category: variability): Beta C? Amp. 0.07V, 0.157d, modulation 352d. Line profiles also vary per. 0.157d.

double/multiple star system information

separation 1,3 arcsec
mag difference (of double or brightest multiple) 3,2
note Worley (1978) update of the IDS
note (category: spectroscopic binaries): 0.157d and 352d. Interferometer measures indicate multiple star.

miscellaneous information

note (category: group membership): Sco-Cen assoc.

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

position, motion, parallax:

position (J2000) RA: 14h 3min 49,408sec DEC: -60° 22' 22,79'' ±0,06 arcsec source: 15
proper motion (J2000) RA: -0,0043 arcsec/a DEC: -0,019 arcsec/a source: 25
radial velocity 6 km/s source: 25
trigonometric parallax 0,009 ±0,001 arcsec source: 25
galactic coord. (B1950) longitude: 311,77° latitude: 1,25°
GCI unit vector (J2000) X: -0,423938 Y: -0,254283 Z: -0,869262

magnitude:

visual 0,61 (observed) source: 25
photovisual 0,9 source: 2
photographic 0,6 source: 2

spectral information:

spectral class B1 source: 96
Morgan-Keenan B1III source: 25
B-magnitude 0,38 ±0,05 B-V-magnitude -0,23
U-magnitude -0,6 ±0,05 U-B-magnitude -0,98

variability information:

source of data: 30
variability type 140
var. amplitude 0,05
var. period 0,16

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 1,3 arcsec
magnitude difference between brightest and second brightest component 3
position angle 251 °

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
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 0min 16,51sec DEC: -60° 7' 58,09'' ±0,007 arcsec
position (J2000) RA: 14h 3min 49,462sec DEC: -60° 22' 22,73''
proper motion J1950 (FK4) RA: -0,0027 arcsec/a DEC: -0,023 arcsec/a ±0,001 arcsec/a in RA
±0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0035 arcsec/a DEC: -0,019 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 0,9 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class B1
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 518
Durchmusterung CP-59 5365
Boss General Catalogue 18971
Henry Draper Catalogue 122451

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

position and proper motion:

position (J2000) RA: 14h 3,8min DEC: -60° 22'
proper motion (J2000) RA: -0,032 arcsec/a DEC: -0,019 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
- 1935 22 259° 1,3'' 0,7 3,7 B1III VOU 31
1960 251° -

discoverer information:

discoverer code discoverer reference
VOU 31 Voute, J.G. -

notes:

note Beta Cen. Spectroscopic and interferometric measures indicate a multiple system.

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

position:

position (J1950) RA: 14h 0min 16,5sec DEC: -60° 7' 58''

variability informations:

variability type BCEP pulsating variable star
magnitute at max. brightness 0,61
magnitute amplitude 0,045
photometric system visual, photovisual or Johnson's V
period [d] 0,157

spectral information

spectral class B1III

references

to a study Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph Vol. I GCVS (see Kholopov et al. 1985-1988)

miscanellous

ID in the GCVS catalogue 19/9002
constellation Centaurus
notes on existence The star is equivalent to '0199004 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.