Algeiba
| catalogues and names | Algeiba, g1Leo, NSV 04823, 41 Leo, HR 4057, HD 89484, SAO 81298, WDS 10200+1950A |
| other names | Algieba, Al Gieba |
| constellation | Leo |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | ALGIEBA; Algeiba; Al Gieba. |
position, motion, parallax:
| position (J2000) | RA: 10h 19min 58,3sec | DEC: +19° 50' 30'' |
| position (J1900) | RA: 10h 14min 27,6sec | DEC: +20° 20' 51'' |
| proper motion (J2000) | RA: 0,306 arcsec/a | DEC: -0,147 arcsec/a |
| radial velocity | -37 km/s note: spectroscopic binaries |
|
| rotational velocity | <17 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,022 arcsec | |
| note (category: dynamical parallaxes): | 0.013". |
magnitude
| visual magnitude | 2,61 (V on UBV Johnson system) |
spectral / color information
| spectral class | K1-IIIbFe-0.5 |
| B-V-magnitude | 1,15 |
| U-B-magnitude | 1 |
| R-I-magnitude | 0,62 |
variability information
| variable star identification | 4823 |
| note (category: variability): | Originally confused with eclipsing star Y Leo when var. suspect number 6777 was assigned in 1965. Now HR 4057 is again suspected of variability, 1.84 - 2.03V for combined HR 4057/8. Uncertain which component is the variable. |
double/multiple star system information
| number of components of multiple star system | 4 |
| separation | 4,5 arcsec |
| mag difference (of double or brightest multiple) | 1,2 |
| component ID | AB |
| note (category: double and multiple data): | AB 2.22 K0IIIP, 3.47 G7III, 618.56y, a = 2.505". B is HR 4058. Colors for combined light. Mag. for blend, 1.90V. Component C is the flare star AD Leo (8.07-11.00B) at 5', optical. |
miscellaneous information
| note (category: group membership): | Gamma Leo group. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 10h 19min 58,35sec | DEC: +19° 50' 29,2'' | ±0,76 arcsec | source: 18 |
| proper motion (J2000) | RA: 0,0218 arcsec/a | DEC: -0,164 arcsec/a | source: 25 | |
| radial velocity | -37 km/s | source: 25 | ||
| trigonometric parallax | 0,022 | ±0,002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 216,56° | latitude: 54,65° | ||
| GCI unit vector (J2000) | X: -0,852458 | Y: 0,397632 | Z: 0,339418 | |
magnitude:
| visual | 2,61 (observed) | source: 25 |
| photovisual | 2,6 | source: 2 |
| photographic | 3,6 | source: 16 |
spectral information:
| spectral class | F5 | source: 96 | |
| Morgan-Keenan | K1-IIIbFe-0.5 | source: 25 | |
| B-magnitude | 3,76 ±0,05 | B-V-magnitude | 1,15 |
| U-magnitude | 4,76 ±0,05 | U-B-magnitude | 1 |
double/multiple star system information:
| separation between brightest and second brightest component | 4,6 arcsec |
| magnitude difference between brightest and second brightest component | 1,2 |
| position angle | 123 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 2,61 | F5 | Algeiba, g1Leonis, 41 Leo, HR 4057, HD 89484, SAO 81298 |
| B | 3,47 | K0 | g2Leonis, 41 Leo, HR 4058, HD 89485, SAO 81299 |
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 | |
| 18 | Hipparcos Input Catalog Version 2 Annex |
| Turon, C., et al., "The Hipparcos Input Catalog, Version 2," Centre de Donnees Stellaires Information Bulletin, Vol. 43, p. 5, 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: 10h 17min 13,12sec | DEC: +20° 5' 42,86'' | ±0,008 arcsec |
| position (J2000) | RA: 10h 19min 58,346sec | DEC: +19° 50' 29,93'' | |
| proper motion J1950 (FK4) | RA: 0,0218 arcsec/a | DEC: -0,151 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0217 arcsec/a | DEC: -0,147 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 2,6 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | K0 |
| 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: 14177 |
| Durchmusterung | BD+20 2467A |
| Boss General Catalogue | 14177 |
| Henry Draper Catalogue | 89484 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 10h 20min | DEC: +19° 50' |
| proper motion (J2000) | RA: 0,314 arcsec/a | DEC: -0,159 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 | 1828 | often | 102° | 2,5'' | 2,6 | 3,8 | K0III | STF1424 |
| 1990 | 123° | 4,6'' | ||||||
| AC | 1851 | 9 | 294° | 210,7'' | 2,6 | 9,6 | - | STF1424 |
| 1915 | 291° | 259,9'' | ||||||
| AD | 1904 | 1 | 302° | 333'' | 2,6 | 10 | - | STF1424 |
| BC | 1913 | 1 | 291° | 264,4'' | 3,8 | 9,3 | G5III | STF1424 |
| CD | 1852 | 7 | 320° | 112,5'' | 9,3 | 10 | - | STF1424 |
| 1911 | 334° | 98,3'' |
discoverer information:
| discoverer code | discoverer | reference |
| STF1424 | Struve, F.G.W. | - |
notes:
| note | Gamma Leo. AB: Premature orbits have been computed. C is an optical companion, and is the flare star AD Leo. Speckle by Balega et al showed no companion 1987.3827. D is BD+20@2464. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (J1950) | RA: 10h 17min 13,1sec | DEC: +20° 5' 43'' |
variability informations:
| magnitute at max. brightness | 1,84 |
| magnitute at min. brightness | 2,03 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | * |
references
| to a study | 592735D (designation: GAMMA LEO) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |