z1Coronae Borealis
| catalogues and names | z1CrB, 7 CrB, HR 5833, HD 139891, SAO 64833, WDS 15394+3638B |
| constellation | Corona Borealis |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 15h 39min 22,2sec | DEC: +36° 38' 12'' |
| position (J1900) | RA: 15h 35min 36,2sec | DEC: +36° 57' 41'' |
| proper motion (J2000) | RA: -0,014 arcsec/a | DEC: -0,013 arcsec/a |
| radial velocity | -19 km/s | |
| rotational velocity | 25 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,015 arcsec | |
| note (category: dynamical parallaxes): | 0.010". |
magnitude
| visual magnitude | 6 (original HR magnitude) |
spectral / color information
| spectral class | B9V |
double/multiple star system information
| separation | 6,4 arcsec |
| mag difference (of double or brightest multiple) | 1 |
| note (category: double and multiple data): | Binary with HR 5834. Colors for combined light; combined mag., 66V. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 15h 39min 22,26sec | DEC: +36° 38' 12,3'' | ±0,76 arcsec | source: 18 |
| proper motion (J2000) | RA: -0,0014 arcsec/a | DEC: -0,011 arcsec/a | source: 25 | |
| radial velocity | -19 km/s | source: 25 | ||
| trigonometric parallax | 0,015 | ±0,002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 58,7° | latitude: 53,41° | ||
| GCI unit vector (J2000) | X: -0,46206 | Y: -0,65605 | Z: 0,59674 | |
magnitude:
| visual | 6,01 (observed) | source: 25 |
| photovisual | 6 | source: 2 |
| photographic | 6 | source: 2 |
spectral information:
| spectral class | B8 | source: 29 | |
| Morgan-Keenan | B9V | source: 25 | |
| B-magnitude | 5,92 ±0,05 | B-V-magnitude | -0,09 |
| U-magnitude | 5,45 ±0,05 | U-B-magnitude | -0,47 |
double/multiple star system information:
| separation between brightest and second brightest component | 6,3 arcsec |
| magnitude difference between brightest and second brightest component | 0,9 |
| position angle | 305 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 5,05 | B8 | z2Coronae Borealis, 7 CrB, HR 5834, HD 139892, SAO 64834 |
| B | 6,01 | B8 | z1Coronae Borealis, 7 CrB, HR 5833, HD 139891, SAO 64833 |
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 | |
| 29 | SAOJ2000 |
| SAO on FK5 at J2000, 1989 | |
data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)
position and proper motion:
| position (J1950) | RA: 15h 37min 29,106sec | DEC: +36° 47' 52,71'' | ±0,032 arcsec |
| position (J2000) | RA: 15h 39min 22,206sec | DEC: +36° 38' 11,77'' | |
| proper motion J1950 (FK4) | RA: -0,0015 arcsec/a | DEC: -0,016 arcsec/a | ±0,005 arcsec/a in RA ±0,005 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0012 arcsec/a | DEC: -0,013 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 6 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | B8 |
| 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: 21063 |
| Durchmusterung | BD+37 2665B |
| Boss General Catalogue | 21063 |
| Henry Draper Catalogue | 139891 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 15h 39,4min | DEC: +36° 38' |
| proper motion (J2000) | RA: -0,014 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 |
| - | 1822 | often | 301° | 6'' | 5,1 | 6 | B7V B9V | STF1965 |
| 1978 | 305° | 6,3'' |
discoverer information:
| discoverer code | discoverer | reference |
| STF1965 | Struve, F.G.W. | - |
notes:
| note | Zeta (2) CrB. A is a spectroscopic binary. B is Zeta (1) CrB. Proper motion of B -017 -023. |