Alkaid
| catalogues and names | Alkaid, h UMa, NSV 06450, 85 UMa, HR 5191, HD 120315, SAO 44752, FK5: 509 |
| other names | Benetnash, Benetnasch, Elkeid |
| constellation | Ursa Major |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | ALKAID; Benetnash; Benetnasch; Elkeid. |
position, motion, parallax:
| position (J2000) | RA: 13h 47min 32,4sec | DEC: +49° 18' 48'' |
| position (J1900) | RA: 13h 43min 36sec | DEC: +49° 48' 45'' |
| proper motion (J2000) | RA: -0,122 arcsec/a | DEC: -0,011 arcsec/a |
| radial velocity | -11 km/s note: spectroscopic binaries |
|
| rotational velocity | 205 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,035 arcsec | |
magnitude
| visual magnitude | 1,86 (V on UBV Johnson system) |
spectral / color information
| spectral class | B3V |
| B-V-magnitude | -0,19 |
| U-B-magnitude | -0,67 |
| R-I-magnitude | -0,18 |
| note (category: spectra): | Lyman alpha observed from COPERNICUS. |
| note (category: colors): | Color excess E(B-V) = +0.02. |
variability information
| variable star identification | 6450 |
miscellaneous information
| note (category: group membership): | Cas-Tau OB1; member of Pleiades group. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 13h 47min 32,434sec | DEC: +49° 18' 47,95'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: -0,0125 arcsec/a | DEC: -0,011 arcsec/a | source: 25 | |
| radial velocity | -11 km/s | source: 25 | ||
| trigonometric parallax | 0,035 | ±0,003 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 100,68° | latitude: 65,32° | ||
| GCI unit vector (J2000) | X: -0,581459 | Y: -0,294802 | Z: 0,758286 | |
magnitude:
| visual | 1,86 (observed) | source: 25 |
| photovisual | 1,9 | source: 2 |
spectral information:
| spectral class | B3 | source: 96 | |
| Morgan-Keenan | B3V | source: 25 | |
| B-magnitude | 1,67 ±0,05 | B-V-magnitude | -0,19 |
| U-magnitude | 1 ±0,05 | U-B-magnitude | -0,67 |
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: 13h 45min 34,294sec | DEC: +49° 33' 44,13'' | ±0,003 arcsec |
| position (J2000) | RA: 13h 47min 32,44sec | DEC: +49° 18' 48,06'' | |
| proper motion J1950 (FK4) | RA: -0,0129 arcsec/a | DEC: -0,014 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0124 arcsec/a | DEC: -0,01 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 1,9 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | B3 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 509 |
| Durchmusterung | BD+50 2027 |
| Boss General Catalogue | 18643 |
| Henry Draper Catalogue | 120315 |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (J1950) | RA: 13h 45min 34,3sec | DEC: +49° 33' 44'' |
variability informations:
| magnitute at max. brightness | 1,83 |
| magnitute at min. brightness | 1,89 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | B3 |
references
| to a study | 290477D (designation: ZI 1023) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |