n1Coronae Borealis
| catalogues and names | n1CrB, NSV 07676, 20 CrB, HR 6107, HD 147749, SAO 65257, WDS 16224+3348A |
| constellation | Corona Borealis |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 16h 22min 21,4sec | DEC: +33° 47' 57'' |
| position (J1900) | RA: 16h 18min 35,5sec | DEC: +34° 2' 4'' |
| proper motion (J2000) | RA: 0,007 arcsec/a | DEC: -0,037 arcsec/a |
| radial velocity | -13 km/s note: variable radial velocity |
|
| trigonometric parallax | 0,003 arcsec | |
magnitude
| visual magnitude | 5,2 (V on UBV Johnson system) |
spectral / color information
| spectral class | M2IIIab |
| B-V-magnitude | 1,6 |
| U-B-magnitude | 1,94 |
| R-I-magnitude | 0,87 (Eggen) |
variability information
| variable star identification | 7676 |
double/multiple star system information
| number of components of multiple star system | 4 |
| separation | 364,4 arcsec |
| mag difference (of double or brightest multiple) | 0,1 |
| component ID | AB |
| note | Worley (1978) update of the IDS |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 16h 22min 21,439sec | DEC: +33° 47' 56,66'' | ±0,35 arcsec | source: 17 |
| proper motion (J2000) | RA: 0,0008 arcsec/a | DEC: -0,038 arcsec/a | source: 25 | |
| radial velocity | -13 km/s | source: 25 | ||
| trigonometric parallax | 0,003 | - | source: 25 | |
| galactic coord. (B1950) | longitude: 54,81° | latitude: 44,55° | ||
| GCI unit vector (J2000) | X: -0,343428 | Y: -0,756708 | Z: 0,556282 | |
magnitude:
| visual | 5,2 (observed) | source: 25 |
| photovisual | 5,4 | source: 2 |
| photographic | 6,7 | source: 16 |
spectral information:
| spectral class | M0 | source: 96 | |
| Morgan-Keenan | M2IIIab | source: 25 | |
| B-magnitude | 6,8 ±0,05 | B-V-magnitude | 1,6 |
| U-magnitude | 8,74 ±0,05 | U-B-magnitude | 1,94 |
double/multiple star system information:
| separation between brightest and second brightest component | 364,4 arcsec |
| magnitude difference between brightest and second brightest component | 0,19 |
| position angle | 165 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 5,2 | M0 | n1Coronae Borealis, 20 CrB, HR 6107, HD 147749, SAO 65257 |
| B | 5,39 | K5 | n2Coronae Borealis, 21 CrB, HR 6108, HD 147767, SAO 65259 |
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 | |
| 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 | |
| 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: 16h 20min 28,367sec | DEC: +33° 54' 56,32'' | ±0,018 arcsec |
| position (J2000) | RA: 16h 22min 21,44sec | DEC: +33° 47' 56,65'' | |
| proper motion J1950 (FK4) | RA: 0,0003 arcsec/a | DEC: -0,04 arcsec/a | ±0,003 arcsec/a in RA ±0,003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0006 arcsec/a | DEC: -0,037 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5,4 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | M0 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 22026 |
| Durchmusterung | BD+34 2773 |
| Boss General Catalogue | 22026 |
| Henry Draper Catalogue | 147749 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 16h 22,4min | DEC: +33° 48' |
| proper motion (J2000) | RA: 0,01 arcsec/a | DEC: -0,038 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 | 1835 | 10 | 166° | 371,9'' | 5,2 | 5,39 | M2IIIab | STF 29 |
| 1922 | 165° | 364,4'' | ||||||
| Aa | 1879 | 4 | 238° | 68,8'' | 5,2 | 11,1 | - | H 81 |
| Ab | 1913 | 2 | 154° | 281,7'' | 5,2 | 12,7 | - | STF 29 |
| 1936 | 152° | 180'' | ||||||
| Bb | 1879 | 5 | 16° | 104,6'' | 5,39 | 10,2 | K5III | H 18 |
| 1921 | - | 102,4'' |
discoverer information:
| discoverer code | discoverer | reference |
| STF 29 | Struve, F.G.W. | - |
| H 81 | Herschel, W. | - |
| H 18 | Herschel, W. | - |
notes:
| note | AB: Nu (1) CrB. Aa: H N 81. Bb: H VI 18. Nu (1) and Nu (2) CrB. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (J1950) | RA: 16h 20min 28,3sec | DEC: +33° 54' 57'' |
variability informations:
| magnitute at max. brightness | 5,2 |
| magnitute amplitude | 0,08 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | M2 |
references
| to a study | 300015D (designation: HR 6107) |