g Centauri
| 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:
| 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. |