g Arae
| catalogues and names | g Ara, HR 6462, HD 157246, SAO 244726, WDS 17254-5623A |
| constellation | Ara |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 17h 25min 23,6sec | DEC: -56° 22' 39'' |
| position (J1900) | RA: 17h 16min 58,5sec | DEC: -56° 17' 0'' |
| proper motion (J2000) | RA: -0,002 arcsec/a | DEC: -0,012 arcsec/a |
| radial velocity | -3 km/s note: variable radial velocity |
|
| rotational velocity | 281 km/s (uncertain) (variable) | |
magnitude
| visual magnitude | 3,34 (V on UBV Johnson system) |
spectral / color information
| spectral class | B1Ib |
| B-V-magnitude | -0,13 |
| U-B-magnitude | -0,96 |
| note (category: spectra): | Unusually large line broadening for luminosity Ib. Also classified B1III. |
| note (category: colors): | Color excess E(B-V) = +0.08. |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 17,9 arcsec |
| mag difference (of double or brightest multiple) | 7 |
| component ID | AB |
| note | Worley (1978) update of the IDS |
| note (category: double and multiple data): | Component B, A7V; C is optical. |
miscellaneous information
| note (category: group membership): | Sco-Cen assoc.; doubtful member of the Sco-Cen cluster. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 17h 25min 23,742sec | DEC: -56° 22' 39,89'' | ±0,19 arcsec | source: 16 |
| proper motion (J2000) | RA: 0,0022 arcsec/a | DEC: -0,016 arcsec/a | source: 25 | |
| radial velocity | -3 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 334,65° | latitude: -11,48° | ||
| GCI unit vector (J2000) | X: -0,083288 | Y: -0,547415 | Z: -0,832706 | |
magnitude:
| visual | 3,34 (observed) | source: 25 |
| photovisual | 3,5 | source: 2 |
| photographic | 3,3 | source: 2 |
spectral information:
| spectral class | B1 | source: 96 | |
| Morgan-Keenan | B1Ib | source: 25 | |
| B-magnitude | 3,21 ±0,05 | B-V-magnitude | -0,13 |
| U-magnitude | 2,25 ±0,05 | U-B-magnitude | -0,96 |
double/multiple star system information:
| separation between brightest and second brightest component | 17,9 arcsec |
| magnitude difference between brightest and second brightest component | 6,89 |
| position angle | 328 ° |
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: 17h 21min 10,732sec | DEC: -56° 19' 58,85'' | ±0,022 arcsec |
| position (J2000) | RA: 17h 25min 23,625sec | DEC: -56° 22' 39,41'' | |
| proper motion J1950 (FK4) | RA: 0,0003 arcsec/a | DEC: -0,011 arcsec/a | ±0,004 arcsec/a in RA ±0,003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0003 arcsec/a | DEC: -0,012 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3,5 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | B1 |
| 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) |
catalogues
| source catalogue | GC, catalogue number: 23517 |
| Durchmusterung | CP-56 8225 |
| Boss General Catalogue | 23517 |
| Henry Draper Catalogue | 157246 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 17h 25,4min | DEC: -56° 23' |
| proper motion (J2000) | RA: -0,01 arcsec/a | DEC: -0,025 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 | 1872 | 7 | 328° | 17,9'' | 3,32 | 10,21 | B1Ib | HJ 4942 |
| AC | 1913 | 1 | 66° | 41,6'' | 3,32 | 12,16 | - | HJ 4942 |
discoverer information:
| discoverer code | discoverer | reference |
| HJ 4942 | Herschel, J. | - |
notes:
| note | Gamma Ara. |