e Bootis
| catalogues and names | e Boo, 36 Boo, HR 5505, HD 129988, SAO 83500, WDS 14450+2704B |
| constellation | Bootes |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 14h 44min 59,2sec | DEC: +27° 4' 30'' |
| position (J1900) | RA: 14h 40min 37,1sec | DEC: +27° 29' 47'' |
| proper motion (J2000) | RA: -0,05 arcsec/a | DEC: 0,021 arcsec/a |
| radial velocity | -23 km/s note: spectroscopic binaries, double lined spectra |
|
| rotational velocity | 147 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,016 arcsec | |
| note (category: dynamical parallaxes): | 0.007". |
magnitude
| visual magnitude | 5,12 (original HR magnitude) |
spectral / color information
| spectral class | A2V |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 2,8 arcsec |
| mag difference (of double or brightest multiple) | 2,6 |
| component ID | AB |
| note (category: double and multiple data): | Binary with HR 5506. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 14h 44min 59,161sec | DEC: +27° 4' 29,73'' | ±0,5 arcsec | source: 25 |
| proper motion (J2000) | RA: -0,0038 arcsec/a | DEC: 0,025 arcsec/a | source: 25 | |
| radial velocity | -23 km/s | source: 25 | ||
| trigonometric parallax | 0,016 | ±0,002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 39,38° | latitude: 64,78° | ||
| GCI unit vector (J2000) | X: -0,669483 | Y: -0,587049 | Z: 0,455155 | |
magnitude:
| visual | 5,12 (observed) | source: 51 |
| photovisual | 5,1 | source: 2 |
| photographic | 5,1 | source: 2 |
spectral information:
| spectral class | A0 | source: 96 | |
| Morgan-Keenan | A2V | source: 25 | |
| B-magnitude | 6,09 ±0,004 | B-V-magnitude | 0,968 |
| U-magnitude | 6,81 ±0,024 | U-B-magnitude | 0,718 |
double/multiple star system information:
| separation between brightest and second brightest component | 2,6 arcsec |
| magnitude difference between brightest and second brightest component | 2,4 |
| position angle | 343 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 2,7 | K0 | Izar, e Bootis, 36 Boo, HR 5506, HD 129989, SAO 83500 |
| B | 5,12 | A0 | e Bootis, 36 Boo, HR 5505, HD 129988, SAO 83500 |
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 | |
| 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 | |
| 51 | Harvard photometry |
| "H" coded (Harvard photometry) magnitudes from the BSC5. | |
| 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: 14h 42min 48,137sec | DEC: +27° 17' 2,66'' | ±0,005 arcsec |
| position (J2000) | RA: 14h 44min 59,229sec | DEC: +27° 4' 27,14'' | |
| proper motion J1950 (FK4) | RA: -0,0038 arcsec/a | DEC: 0,018 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0037 arcsec/a | DEC: 0,021 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 2,7 (accuracy: 2 decimals) |
| source of visual magnitude data | Combined magnitude of component stars. |
spectral information:
| spectral class | K0 |
| source of spectral data | Taken from the HD with M stars reclassified by Miss Cannon. |
remarks for duplicity and variability
| Double star - see source catalog for source |
catalogues
| source catalogue | FK3, catalogue number: 1633 |
| Durchmusterung | BD+27 2417 |
| Boss General Catalogue | 19856 |
| Henry Draper Catalogue | 129988 The "SAO Catalog" entry refers to two consecutive HD numbers, the lower of which is given. |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 14h 45min | DEC: +27° 4' |
| proper motion (J2000) | RA: -0,051 arcsec/a | DEC: 0,025 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 | 1822 | often | 321° | 2,6'' | 2,7 | 5,1 | K0II-III | STF1877 |
| 1988 | 343° | - | ||||||
| AC | 1912 | 3 | 257° | 178,7'' | 2,7 | 12 | - | STF1877 |
| 1988 | 256° | 176,4'' |
discoverer information:
| discoverer code | discoverer | reference |
| STF1877 | Struve, F.G.W. | - |
notes:
| note | Epsilon Boo. B is a spectroscopic binary. |