Adharaz
| catalogues and names | Adharaz, e CMa, 21 CMa, HR 2618, HD 52089, SAO 172676, FK5: 268, WDS 06586-2858 |
| other names | Adara, Adhara |
| constellation | Canis Major |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | ADARA; ADHARA. |
position, motion, parallax:
| position (J2000) | RA: 6h 58min 37,5sec | DEC: -28° 58' 20'' |
| position (J1900) | RA: 6h 54min 41,7sec | DEC: -28° 50' 9'' |
| proper motion (J2000) | RA: 0,004 arcsec/a | DEC: 0,003 arcsec/a |
| radial velocity | 27 km/s | |
| rotational velocity | 44 km/s (uncertain) (variable) | |
| dynamical parallax | 0,001 arcsec | |
magnitude
| visual magnitude | 1,5 (V on UBV Johnson system) |
spectral / color information
| spectral class | B2II |
| B-V-magnitude | -0,21 |
| U-B-magnitude | -0,93 |
| R-I-magnitude | -0,21 |
| note (category: spectra): | Lyman alpha observed from COPERNICUS. |
| note (category: colors): | Color excess E(B-V) = +0.02. |
double/multiple star system information
| separation | 7,5 arcsec |
| mag difference (of double or brightest multiple) | 6,4 |
| note (category: double and multiple data): | Fixed sep. |
miscellaneous information
| note (category: group membership): | Member of Pleiades group. |
| note (category: stellar radii or diameters): | Diam. = 0.00077 - 0.00080". |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 6h 58min 37,548sec | DEC: -28° 58' 19,5'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,0003 arcsec/a | DEC: 0,003 arcsec/a | source: 25 | |
| radial velocity | 27 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 239,83° | latitude: -11,33° | ||
| GCI unit vector (J2000) | X: -0,221358 | Y: 0,846388 | Z: -0,484383 | |
magnitude:
| visual | 1,5 (observed) | source: 25 |
| photovisual | 1,6 | source: 2 |
| photographic | 1,4 | source: 2 |
spectral information:
| spectral class | B1 | source: 96 | |
| Morgan-Keenan | B2II | source: 25 | |
| B-magnitude | 1,29 ±0,05 | B-V-magnitude | -0,21 |
| U-magnitude | 0,36 ±0,05 | U-B-magnitude | -0,93 |
double/multiple star system information:
| separation between brightest and second brightest component | 7,5 arcsec |
| magnitude difference between brightest and second brightest component | 6 |
| position angle | 161 ° |
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: 6h 56min 39,587sec | DEC: -28° 54' 10,24'' | ±0,005 arcsec |
| position (J2000) | RA: 6h 58min 37,561sec | DEC: -28° 58' 19,41'' | |
| proper motion J1950 (FK4) | RA: 0,0001 arcsec/a | DEC: 0,002 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0005 arcsec/a | DEC: 0,004 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 1,6 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | B1 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 268 |
| Durchmusterung | CD-28 3666 |
| Boss General Catalogue | 9188 |
| Henry Draper Catalogue | 52089 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 6h 58,6min | DEC: -28° 58' |
| proper motion (J2000) | RA: 0,004 arcsec/a | DEC: 0,003 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 |
| - | 1850 | 19 | 161° | 7,5'' | 1,5 | 7,5 | B2II | CPO 7 |
discoverer information:
| discoverer code | discoverer | reference |
| CPO 7 | Cape Observatory | - |
notes:
| note | Epsilon CMa. |