z2Coronae Borealis
| catalogues and names | z2CrB, 7 CrB, HR 5834, HD 139892, SAO 64834, WDS 15394+3638A |
| constellation | Corona Borealis |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 15h 39min 22,7sec | DEC: +36° 38' 9'' |
| position (J1900) | RA: 15h 35min 36,6sec | DEC: +36° 57' 37'' |
| proper motion (J2000) | RA: -0,013 arcsec/a | DEC: -0,006 arcsec/a |
| radial velocity | -24 km/s note: spectroscopic binaries, double lined spectra note: orbital data avaible |
|
| rotational velocity | 100 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,015 arcsec | |
| note (category: dynamical parallaxes): | 0.010". |
magnitude
| visual magnitude | 5,07 (original HR magnitude) |
spectral / color information
| spectral class | B7V |
| B-V-magnitude | -0,12 |
| U-B-magnitude | -0,47 |
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 5833. |
| note (category: spectroscopic binaries): | ADS 9737A, B6V+B6V, 12.5842d, K 126.1k/s, V0 -14.3k/s, msin3i 9.40, asini 21.8. Both components vsini 100:k/s. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 15h 39min 22,68sec | DEC: +36° 38' 8,8'' | ±0,76 arcsec | source: 18 |
| proper motion (J2000) | RA: -0,0016 arcsec/a | DEC: -0,015 arcsec/a | source: 25 | |
| radial velocity | -24 km/s | source: 25 | ||
| trigonometric parallax | 0,015 | ±0,002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 58,69° | latitude: 53,41° | ||
| GCI unit vector (J2000) | X: -0,462046 | Y: -0,656073 | Z: 0,596726 | |
magnitude:
| visual | 5,05 (observed) | source: 25 |
| photovisual | 5,1 | source: 2 |
| photographic | 5 | source: 2 |
spectral information:
| spectral class | B8 | source: 96 | |
| Morgan-Keenan | B7V | source: 25 | |
| B-magnitude | 4,93 ±0,05 | B-V-magnitude | -0,12 |
| U-magnitude | 4,45 ±0,05 | U-B-magnitude | -0,48 |
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 | |
| 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: 15h 37min 29,59sec | DEC: +36° 47' 49,58'' | ±0,01 arcsec |
| position (J2000) | RA: 15h 39min 22,695sec | DEC: +36° 38' 9,02'' | |
| proper motion J1950 (FK4) | RA: -0,0014 arcsec/a | DEC: -0,009 arcsec/a | ±0,002 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0011 arcsec/a | DEC: -0,006 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5,1 (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: 21064 |
| Durchmusterung | BD+37 2665A |
| Boss General Catalogue | 21064 |
| Henry Draper Catalogue | 139892 |
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. |