additional / editable data
| entry 1 (3/26/00,2:22:39 PM) |
 |
Izar
catalogues and names
| catalogues and names | Izar, e Boo, 36 Boo, HR 5506, HD 129989, SAO 83500, WDS 14450+2704A |
| other names | Mirac, Mirak, Mirach, Pulcherrima |
| constellation | Bootes |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | IZAR; Mirac; Mirak; Mirach; Mizar, a name commonly applied to HR 5054; Pulcherrima. |
position, motion, parallax:
| position (J2000) | RA: 14h 44min 59.2sec | DEC: +27° 4' 27'' | ||
| position (2000.73) | RA: 14h 45min 1sec | DEC: +27° 4' 16'' | ||
| position (B1900) | RA: 14h 40min 37.1sec | DEC: +27° 29' 45'' | ||
| proper motion (J2000) | RA: -0.049 arcsec/a | DEC: 0.021 arcsec/a | ||
| radial velocity | -17 km/s note: variable radial velocity |
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| trigonometric parallax | 0.016 arcsec | |||
| galactic coordinates | longitude: 39.38° | latitude: 64.78° | ||
| note (category: dynamical parallaxes): | 0.007". |
magnitude
| visual magnitude | 2.7 (original HR magnitude) |
spectral / color information
| spectral class | K0-II-III |
| B-V-magnitude | 0.97 |
| U-B-magnitude | 0.73 |
| R-I-magnitude | |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
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 5505. Colors for combined light. Mag. of blend, 2.37V. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 14h 44min 59.214sec | DEC: +27° 4' 27.44'' | ±0.35 arcsec | source: 17 |
| position (2000.73) | RA: 14h 45min 1sec | DEC: +27° 4' 16'' | JD: 2451810.12 | |
| proper motion (J2000) | RA: -0.0038 arcsec/a | DEC: 0.025 arcsec/a | source: 25 | |
| radial velocity | -17 km/s | source: 25 | ||
| trigonometric parallax | 0.016 arcsec | ±0.002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 39.38° | latitude: 64.78° | ||
magnitude:
| visual | 2.7 (observed) | source: 51 |
| photovisual | 2.7 | source: 2 |
| photographic | 3.7 | source: 2 |
spectral information:
| spectral class | K0 | source: 29 | |
| Morgan-Keenan | K0-II-III | source: 25 | |
| B-magnitude | 3.67 ±0.004 | B-V-magnitude | 0.968 |
| U-magnitude | 4.39 ±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 | |
| 17 | ACRS |
| Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 1991 | |
| 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 | |
| 29 | SAOJ2000 |
| SAO on FK5 at J2000, 1989 | |
| 51 | Harvard photometry |
| "H" coded (Harvard photometry) magnitudes from the BSC5. | |
data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)
position and proper motion:
| position (B1950) | RA: 14h 42min 48.137sec | DEC: +27° 17' 2.66'' | ±0.005 arcsec |
| position (2000.73) | RA: 14h 45min 1sec | DEC: +27° 4' 16'' | JD: 2451810.12 |
| position (J2000) | RA: 14h 44min 59.229sec | DEC: +27° 4' 27.14'' | |
| proper motion B1950 (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. |
additional / editable data
| entry 1 (3/26/00,2:22:39 PM) |
|