Dschubba
| catalogues and names | Dschubba, d Sco, 7 Sco, HR 5953, HD 143275, SAO 184014, FK5: 594, WDS 16003-2237 |
| other names | Iclarkrau |
| constellation | Scorpius |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | Dschubba; Iclarkrau. |
position, motion, parallax:
| position (J2000) | RA: 16h 0min 20sec | DEC: -22° 37' 18'' |
| position (J1900) | RA: 15h 54min 25,1sec | DEC: -22° 20' 14'' |
| proper motion (J2000) | RA: -0,012 arcsec/a | DEC: -0,022 arcsec/a |
| radial velocity | -7 km/s note: spectroscopic binaries |
|
| rotational velocity | 181 km/s (uncertain) (variable) | |
magnitude
| visual magnitude | 2,32 (V on UBV Johnson system) |
spectral / color information
| spectral class | B0.3IV |
| B-V-magnitude | -0,12 |
| U-B-magnitude | -0,91 |
| R-I-magnitude | -0,13 |
| note (category: colors): | Color excess E(B-V) = +0.16. Conspicuous infrared deficiency. |
double/multiple star system information
| number of components of multiple star system | 4 |
| separation | 0,2 arcsec |
| mag difference (of double or brightest multiple) | 0,2 |
| component ID | O |
| note | doublicity discoverd by speckle interferometry |
| note (category: double and multiple data): | Possible quadruple system: SB 3.0, 5.0v, sep. 0.00001", 3.3v at 0.1", and 4.9v at 0.186". |
| note (category: spectroscopic binaries): | Primary SB about 20d. Another companion 4.9v at 0.181", discovered by occultation and speckle interferometry, has longer period. Resolved by speckle observations 1986.45, sep. 0.17". |
miscellaneous information
| note (category: group membership): | Sco OB2; Sco-Cen cluster; upper Sco region; HII region. |
| note (category: stellar radii or diameters): | Diam. = 0.00045 - 0.00046". |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 16h 0min 20,008sec | DEC: -22° 37' 18,04'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: -0,0009 arcsec/a | DEC: -0,022 arcsec/a | source: 25 | |
| radial velocity | -7 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 350,1° | latitude: 22,49° | ||
| GCI unit vector (J2000) | X: -0,460369 | Y: -0,800068 | Z: -0,384645 | |
magnitude:
| visual | 2,32 (observed) | source: 25 |
| photovisual | 2,5 | source: 2 |
| photographic | 2,3 | source: 2 |
spectral information:
| spectral class | B0 | source: 96 | |
| Morgan-Keenan | B0.3IV | source: 25 | |
| B-magnitude | 2,2 ±0,05 | B-V-magnitude | -0,12 |
| U-magnitude | 1,29 ±0,05 | U-B-magnitude | -0,91 |
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 | |
| 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 57min 22,318sec | DEC: -22° 28' 51,37'' | ±0,004 arcsec |
| position (J2000) | RA: 16h 0min 20,021sec | DEC: -22° 37' 18,01'' | |
| proper motion J1950 (FK4) | RA: -0,0007 arcsec/a | DEC: -0,025 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0007 arcsec/a | DEC: -0,022 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 2,5 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | B0 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 594 |
| Durchmusterung | BD-22 4068 |
| Boss General Catalogue | 21489 |
| Henry Draper Catalogue | 143275 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 16h 0,3min | DEC: -22° 37' |
| proper motion (J2000) | RA: -0,012 arcsec/a | DEC: -0,022 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 |
| - | 1973 | 18 | ° | '' | 2,32 | - | Be | LAB |
discoverer information:
| discoverer code | discoverer | reference |
| LAB | Labeyrie et al |