g2Leonis
| catalogues and names | g2Leo, NSV 04823, 41 Leo, HR 4058, HD 89485, SAO 81299, WDS 10200+1950B |
| constellation | Leo |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 10h 19min 58,6sec | DEC: +19° 50' 26'' |
| position (J1900) | RA: 10h 14min 27,8sec | DEC: +20° 20' 49'' |
| proper motion (J2000) | RA: 0,312 arcsec/a | DEC: -0,169 arcsec/a |
| radial velocity | -36 km/s note: variable radial velocity |
|
| trigonometric parallax | 0,022 arcsec | |
| note (category: dynamical parallaxes): | 0.013". |
magnitude
| visual magnitude | 3,8 (original HR magnitude) |
spectral / color information
| spectral class | G7IIIFe-1 |
variability information
| variable star identification | 4823 |
| note (category: variability): | See HR 4057. |
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): | See HR 4057. |
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 58,63sec | DEC: +19° 50' 26,2'' | ±0,76 arcsec | source: 18 |
| proper motion (J2000) | RA: 0,0218 arcsec/a | DEC: -0,164 arcsec/a | source: 25 | |
| radial velocity | -36 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: -0,85247 | Y: 0,397617 | Z: 0,339405 | |
magnitude:
| visual | 3,47 (observed) | source: 25 |
| photovisual | 3,8 | source: 2 |
| photographic | 4,8 | source: 2 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | G7IIIFe-1.5 | source: 25 | |
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 | |
| 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 13,401sec | DEC: +20° 5' 39,69'' | ±0,021 arcsec |
| position (J2000) | RA: 10h 19min 58,646sec | DEC: +19° 50' 25,65'' | |
| proper motion J1950 (FK4) | RA: 0,0222 arcsec/a | DEC: -0,173 arcsec/a | ±0,003 arcsec/a in RA ±0,003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0221 arcsec/a | DEC: -0,169 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3,8 (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: 14178 |
| Durchmusterung | BD+20 2467B |
| Boss General Catalogue | 14178 |
| Henry Draper Catalogue | 89485 |
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)). |