Dsiban
| catalogues and names | Dsiban, y1Dra, 31 Dra, HR 6636, HD 162003, SAO 8890, FK5: 670, WDS 17419+7209A |
| other names | Dziban |
| constellation | Draco |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | Dsiban; Dziban. |
position, motion, parallax:
| position (J2000) | RA: 17h 41min 56,3sec | DEC: +72° 8' 56'' |
| position (J1900) | RA: 17h 43min 42,9sec | DEC: +72° 11' 53'' |
| proper motion (J2000) | RA: 0,025 arcsec/a | DEC: -0,267 arcsec/a |
| radial velocity | -10 km/s note: suspected variable radial velocity |
|
| rotational velocity | 14 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,054 arcsec | |
magnitude
| visual magnitude | 4,58 (V on UBV Johnson system) |
spectral / color information
| spectral class | F5IV-V |
| B-V-magnitude | 0,42 |
| U-B-magnitude | 0,01 |
| R-I-magnitude | 0,23 |
double/multiple star system information
| number of components of multiple star system | 4 |
| separation | 30,2 arcsec |
| mag difference (of double or brightest multiple) | 1,2 |
| component ID | AB |
| note (category: double and multiple data): | CPM with HR 6637, not shared with components C,D. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 17h 41min 56,342sec | DEC: +72° 8' 55,89'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,0054 arcsec/a | DEC: -0,267 arcsec/a | source: 25 | |
| radial velocity | -10 km/s | source: 25 | ||
| trigonometric parallax | 0,054 | ±0,005 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 102,97° | latitude: 31,03° | ||
| GCI unit vector (J2000) | X: -0,024133 | Y: -0,305594 | Z: 0,951856 | |
magnitude:
| visual | 4,58 (observed) | source: 25 |
| photovisual | 4,9 | source: 2 |
spectral information:
| spectral class | F5 | source: 96 | |
| Morgan-Keenan | F5IV-V | source: 25 | |
| B-magnitude | 5 ±0,05 | B-V-magnitude | 0,42 |
| U-magnitude | 5,01 ±0,05 | U-B-magnitude | 0,01 |
double/multiple star system information:
| separation between brightest and second brightest component | 30,3 arcsec |
| magnitude difference between brightest and second brightest component | 1,21 |
| position angle | 15 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 4,58 | F5 | Dsiban, y1Draconis, 31 Dra, HR 6636, HD 162003, SAO 8890 |
| B | 5,79 | F5 | y1Draconis, 31 Dra, HR 6637, HD 162004, SAO 8891 |
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 | |
| 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 42min 49,282sec | DEC: +72° 10' 26,21'' | ±0,004 arcsec |
| position (J2000) | RA: 17h 41min 56,365sec | DEC: +72° 8' 55,93'' | |
| proper motion J1950 (FK4) | RA: 0,0033 arcsec/a | DEC: -0,267 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0056 arcsec/a | DEC: -0,267 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4,9 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | F5 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 670 |
| Durchmusterung | BD+72 804 |
| Boss General Catalogue | 24089 |
| Henry Draper Catalogue | 162003 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 17h 41,9min | DEC: +72° 9' |
| proper motion (J2000) | RA: 0,025 arcsec/a | DEC: -0,267 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 | 1832 | 56 | 15° | 30,3'' | 4,58 | 5,79 | F5IV F8V | STF2241 |
| AC | 1857 | 7 | 128° | 101,5'' | 4,9 | 11,4 | - | STF2241 |
| 1923 | 120° | 89,7'' | ||||||
| AD | 1905 | 1 | 84° | 100,5'' | 4,9 | 12,9 | - | STF2241 |
| CD | 1908 | 1 | 19° | 67,6'' | 11,4 | 12,9 | - | STF2241 |
discoverer information:
| discoverer code | discoverer | reference |
| STF2241 | Struve, F.G.W. | - |
notes:
| note | Psi (1) Dra. B is BD+72@805. Proper motion of B +017 -279. A premature orbit has been computed. |