g Centauri


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


catalogues and names g Cen, HR 4819, HD 110304, SAO 223603, WDS 12415-4858A
constellation Centaurus

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


position, motion, parallax:

position (J2000) RA: 12h 41min 31sec DEC: -48 57' 35''
position (J1900) RA: 12h 35min 59,9sec DEC: -48 24' 38''
proper motion (J2000) RA: -0,189 arcsec/a DEC: -0,005 arcsec/a
radial velocity -6 km/s
note: spectroscopic binaries
rotational velocity 81 km/s (uncertain) (variable)
trigonometric parallax 0,016 arcsec
note (category: dynamical parallaxes): 0.024".

magnitude

visual magnitude 2,17
(V on UBV Johnson system)

spectral / color information

spectral class A1IV
B-V-magnitude -0,01
U-B-magnitude -0,01
R-I-magnitude 0
note (category: colors): Probably bluest member of Hyades group.

double/multiple star system information

number of components of multiple star system 3
separation 1,5 arcsec
mag difference (of double or brightest multiple) 0,1
component ID AB
note Worley (1978) update of the IDS
note (category: double and multiple data): AB 2.9 A0III, 2.9 A0III, 84.50y, a = 0.930". Combined mag., colors.

miscellaneous information

note (category: group membership): Hyades group.

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

position, motion, parallax:

position (J2000) RA: 12h 41min 31,094sec DEC: -48 57' 34,67'' 0,19 arcsec source: 16
proper motion (J2000) RA: -0,0191 arcsec/a DEC: -0,011 arcsec/a source: 25
radial velocity -6 km/s source: 25
trigonometric parallax 0,016 0,002 arcsec source: 25
galactic coord. (B1950) longitude: 301,26 latitude: 13,88
GCI unit vector (J2000) X: -0,645846 Y: -0,118297 Z: -0,754247

magnitude:

visual 2,17 (observed) source: 25
photovisual 2,4 source: 2
photographic 2,4 source: 2

spectral information:

spectral class A0 source: 96
Morgan-Keenan A1IV source: 25
B-magnitude 2,16 0,05 B-V-magnitude -0,01
U-magnitude 2,15 0,05 U-B-magnitude -0,01

double/multiple star system information:

source of data: 19
magnitude difference between brightest and second brightest component 0,1

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
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: 12h 38min 44,898sec DEC: -48 41' 7,32'' 0,015 arcsec
position (J2000) RA: 12h 41min 31,006sec DEC: -48 57' 34,71''
proper motion J1950 (FK4) RA: -0,0192 arcsec/a DEC: -0,008 arcsec/a 0,003 arcsec/a in RA
0,003 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0192 arcsec/a DEC: -0,005 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 2,4 (accuracy: 2 decimals)
source of visual magnitude data Combined magnitude of component stars.

spectral information:

spectral class A0
source of spectral data Taken from the HD with M stars reclassified by Miss Cannon.

remarks for duplicity and variability

Double star - see source catalog for source

catalogues

source catalogue FK3, catalogue number: 476
Durchmusterung CD-48 7597
Boss General Catalogue 17262
Henry Draper Catalogue 110304

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

position and proper motion:

position (J2000) RA: 12h 41,5min DEC: -48 58'
proper motion (J2000) RA: -0,188 arcsec/a DEC: -0,011 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 1835 often '' 2,9 3 A1IV HJ 4539
AB-C 1897 2 118 39,5'' 2,4 14,4 - SEE 159

discoverer information:

discoverer code discoverer reference
HJ 4539 Herschel, J. -
SEE 159 See, T.J. -

notes:

note Gamma Cen. P = 84.5yr., a = 0.93", motion retrograde.