g Lupi
| catalogues and names | g Lup, gam Lup, HR 5776, HD 138690, SAO 225938, WDS 15351-4110 |
| constellation | Lupus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 15h 35min 8,5sec | DEC: -41° 10' 1'' |
| position (J1900) | RA: 15h 28min 28,5sec | DEC: -40° 49' 50'' |
| proper motion (J2000) | RA: -0,015 arcsec/a | DEC: -0,028 arcsec/a |
| radial velocity | 2 km/s note: variable radial velocity |
|
| rotational velocity | 266 km/s (uncertain) (variable) | |
| dynamical parallax | 0,008 arcsec | |
| note (category: radial and/or rotational velocities): | Expanding circumstellar shell. |
magnitude
| visual magnitude | 2,78 (V on UBV Johnson system) |
spectral / color information
| spectral class | B2IV |
| B-V-magnitude | -0,2 |
| U-B-magnitude | -0,82 |
| R-I-magnitude | -0,24 |
| note (category: spectra): | Spectra obtained in March 1987 at Vainu Bappu Obs. showed H alpha profiles with emission peaks. The star may be in transition from B to Be type. |
double/multiple star system information
| separation | 0,6 arcsec |
| mag difference (of double or brightest multiple) | 0,1 |
| note | Worley (1978) update of the IDS |
| note (category: double and multiple data): | 3.5 B2IV-V, 3.6 B2IV-V, 147y, a = 0.59". Combined mag., colors. |
miscellaneous information
| note (category: group membership): | Probable member of Sco-Cen cluster; upper Cen group of Sco-Cen assoc. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 15h 35min 8,371sec | DEC: -41° 10' 0,97'' | ±0,19 arcsec | source: 16 |
| proper motion (J2000) | RA: -0,0031 arcsec/a | DEC: -0,045 arcsec/a | source: 25 | |
| radial velocity | 2 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 333,2° | latitude: 11,89° | ||
| GCI unit vector (J2000) | X: -0,444765 | Y: -0,607358 | Z: -0,658255 | |
magnitude:
| visual | 2,78 (observed) | source: 25 |
| photovisual | 3 | source: 2 |
| photographic | 2,8 | source: 2 |
spectral information:
| spectral class | B3 | source: 96 | |
| Morgan-Keenan | B2IV | source: 25 | |
| B-magnitude | 2,58 ±0,05 | B-V-magnitude | -0,2 |
| U-magnitude | 1,76 ±0,05 | U-B-magnitude | -0,82 |
double/multiple star system information:
| separation between brightest and second brightest component | 0,7 arcsec |
| magnitude difference between brightest and second brightest component | 0,1 |
| position angle | 278 ° |
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: 15h 31min 47,99sec | DEC: -41° 0' 0,97'' | ±0,014 arcsec |
| position (J2000) | RA: 15h 35min 8,456sec | DEC: -41° 10' 0,53'' | |
| proper motion J1950 (FK4) | RA: -0,0014 arcsec/a | DEC: -0,031 arcsec/a | ±0,003 arcsec/a in RA ±0,003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0013 arcsec/a | DEC: -0,028 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | B3 |
| 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: 20926 |
| Durchmusterung | CD-40 9760 |
| Boss General Catalogue | 20926 |
| Henry Draper Catalogue | 138690 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 15h 35,1min | DEC: -41° 10' |
| proper motion (J2000) | RA: -0,017 arcsec/a | DEC: -0,027 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 |
| - | 1835 | 64 | 274° | 0,8'' | 3,5 | 3,6 | B2IV | HJ 4786 |
| 1991 | 278° | 0,7'' |
discoverer information:
| discoverer code | discoverer | reference |
| HJ 4786 | Herschel, J. | - |
notes:
| note | Gamma Lup. P = 190yr., a = 0.66", motion retrograde in a highly-inclined orbit. |