w Leonis
catalogues and names
| catalogues and names | w Leo, 2 Leo, HR 3754, HD 81858, SAO 117717, BD +9 2188, WDS 09285+0903 |
| constellation | Leo |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 9h 28min 27.5sec | DEC: +9° 3' 24'' | ||
| position (B1900) | RA: 9h 23min 6.1sec | DEC: +9° 29' 32'' | ||
| proper motion (J2000) | RA: 0.055 arcsec/a | DEC: -0.004 arcsec/a | ||
| radial velocity | -6 km/s note: spectroscopic binaries note: orbital data avaible |
|||
| trigonometric parallax | 0.034 arcsec | |||
| galactic coordinates | longitude: 223.66° | latitude: 38.9° | ||
| note (category: dynamical parallaxes): | 0.024". |
magnitude
| visual magnitude | 5.41 (V on UBV Johnson system) |
spectral / color information
| spectral class | F9V |
| B-V-magnitude | 0.6 |
| U-B-magnitude | 0.14 |
double/multiple star system information
| separation | 0.5 arcsec |
| mag difference (of double or brightest multiple) | 0.7 |
| note (category: double and multiple data): | 5.87 dF8, 6.53, 116.85y, a = 0.875" or 118.227y, a = 0.880". |
| note (category: spectroscopic binaries): | 116.85y D, K 2.2k/s, V0 -6.0k/s, asini 1070. Orbit questioned by Morbey and Griffin (1987, ApJ, 317, 343). |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 9h 28min 27.416sec | DEC: +9° 3' 24.17'' | ±0.2 arcsec | source: 52 |
| proper motion (J2000) | RA: 0.0036 arcsec/a | DEC: -0.008 arcsec/a | source: 25 | |
| radial velocity | -6 km/s | source: 25 | ||
| trigonometric parallax | 0.034 arcsec | ±0.003 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 223.67° | latitude: 38.9° | ||
magnitude:
| visual | 5.41 (observed) | source: 25 |
| photovisual | 5.5 | source: 2 |
| photographic | 6 | source: 16 |
spectral information:
| spectral class | G0 | source: 96 | |
| Morgan-Keenan | F9V | source: 25 | |
| B-magnitude | 6.01 ±0.05 | B-V-magnitude | 0.6 |
| U-magnitude | 6.15 ±0.05 | U-B-magnitude | 0.14 |
double/multiple star system information:
| magnitude difference between brightest and second brightest component | 0.7 |
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 | |
| 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 | |
| 52 | PPMN-HP subset |
| PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H) | |
| 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 (B1950) | RA: 9h 25min 46.858sec | DEC: +9° 16' 32.01'' | ±0.019 arcsec |
| position (J2000) | RA: 9h 28min 27.455sec | DEC: +9° 3' 24.45'' | |
| proper motion B1950 (FK4) | RA: 0.0036 arcsec/a | DEC: -0.007 arcsec/a | ±0.003 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0037 arcsec/a | DEC: -0.004 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.5 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | G0 |
| 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: 13062 |
| Durchmusterung | BD+09 2188 |
| Boss General Catalogue | 13062 |
| Henry Draper Catalogue | 81858 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 9h 28.5min | DEC: +9° 3' |
| proper motion (J2000) | RA: 0.049 arcsec/a | DEC: -0.009 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 |
| - | 1825 | often | ° | '' | 5.9 | 6.6 | F9IV | STF1356 |
discoverer information:
| discoverer code | discoverer | reference |
| STF1356 | Struve, F.G.W. | - |
notes:
| note | Omega Leo. P = 117yr., a = 0.88", motion direct. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 9h 23.1min | DEC: +9° 30' |
magnitudes, spectral classes, orbital elements:
| author: | P. Muller | E. van Dessel |
| date of observation: | 1956 | 1974 |
| magnitude of component A: | 5.87 | 5.87 |
| magnitude of component B: | 5.87 | 5.87 |
| spectral class component B: | F9V | F9V |
| spectral class component B: | F9V | F9V |
| period [y]: | 116.85 | 118.227 |
| semi-major axis [arcsec]: | 0.875 | 0.88 |
| inclination [deg]: | 64.5 | 66.05 |
| node [deg]: | 325.95 (ascending) | 325.69 (ascending) |
| equinox of node: | 1950 | 1900 |
| eccentricity: | 0.56 | 0.557 |
| time of periastron passage: | 1959.55 | 1959.4 |
| dates of ephemeris: | 1950-1970 | 1976-2000 |
| grade: | good | good |
| reference: | Bull. Astron. Paris 21, 131; 1957. | Astron. Astrophys. Suppl. 26, 415; 1976. |
| other name(s) | STF 1356, Omega Leo |