w1Cygni
catalogues and names
| catalogues and names | w1Cyg, V2014 Cyg, 45 Cyg, HR 7844, HD 195556, SAO 49712, BD +48 3142, FK5: 3641, WDS 20301+4857A |
| constellation | Cygnus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | See HR 7828. In the older literature HR 7844 often confused with HR 7851 (q.v.) because the magnitudes and separations of the two brighter components of each, 7844AB, 7851AC, are nearly the same, although the position angles differ. In Allen under the star named Ruchba the P.A. corresponds to HR 7844 while the color clearly refers to HR 7851. |
position, motion, parallax:
| position (J2000) | RA: 20h 30min 3.5sec | DEC: +48° 57' 6'' | ||
| position (2000.72) | RA: 20h 30min 4sec | DEC: +48° 57' 15'' | ||
| position (B1900) | RA: 20h 26min 57.6sec | DEC: +48° 36' 55'' | ||
| proper motion (J2000) | RA: 0.013 arcsec/a | DEC: 0.008 arcsec/a | ||
| radial velocity | -22 km/s note: spectroscopic binaries |
|||
| rotational velocity | 184 km/s (uncertain) (variable) | |||
| galactic coordinates | longitude: 86.07° | latitude: 5.74° | ||
magnitude
| visual magnitude | 4.95 (V on UBV Johnson system) |
spectral / color information
| spectral class | B2.5IV |
| B-V-magnitude | -0.09 |
| U-B-magnitude | -0.63 |
| R-I-magnitude |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 56.3 arcsec |
| mag difference (of double or brightest multiple) | 7 |
| component ID | AC |
| note (category: double and multiple data): | Component B, 12.9v A5V at 18", optical. |
miscellaneous information
| note (category: group membership): | In reflection nebula. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 20h 30min 3.545sec | DEC: +48° 57' 5.76'' | ±0.22 arcsec | source: 15 |
| position (2000.72) | RA: 20h 30min 5sec | DEC: +48° 57' 15'' | JD: 2451809.24 | |
| proper motion (J2000) | RA: 0.0013 arcsec/a | DEC: 0.008 arcsec/a | source: 25 | |
| radial velocity | -22 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 86.08° | latitude: 5.74° | ||
magnitude:
| visual | 4.95 (observed) | source: 25 |
| photovisual | 4.9 | source: 2 |
spectral information:
| spectral class | B3 | source: 96 | |
| Morgan-Keenan | B2.5IV | source: 25 | |
| B-magnitude | 4.86 ±0.05 | B-V-magnitude | -0.09 |
| U-magnitude | 4.23 ±0.05 | U-B-magnitude | -0.63 |
double/multiple star system information:
| separation between brightest and second brightest component | 17.8 arcsec |
| magnitude difference between brightest and second brightest component | 7.9 |
| position angle | 341 ° |
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 | |
| 15 | FK5, FK5 Extension and FK5 Supplement |
| Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 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 (B1950) | RA: 20h 28min 30.54sec | DEC: +48° 46' 57.97'' | ±0.016 arcsec |
| position (2000.72) | RA: 20h 30min 5sec | DEC: +48° 57' 14'' | JD: 2451809.24 |
| position (J2000) | RA: 20h 30min 3.553sec | DEC: +48° 57' 5.94'' | |
| proper motion B1950 (FK4) | RA: 0.0009 arcsec/a | DEC: 0.011 arcsec/a | ±0.003 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0013 arcsec/a | DEC: 0.009 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.9 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | B3 |
| 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: 28537 |
| Durchmusterung | BD+48 3142 |
| Boss General Catalogue | 28537 |
| Henry Draper Catalogue | 195556 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 20h 30.1min | DEC: +48° 57' |
| proper motion (J2000) | RA: 0.013 arcsec/a | DEC: 0.008 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 | 1878 | 7 | 341° | 17.8'' | 4.95 | 12.9 | B2.5IV | BU 669 |
| AC | 1878 | 9 | 86° | 56.3'' | 4.95 | 9.4 | - | BU 669 |
| AD | 1918 | 1 | 45° | 133'' | 4.95 | - | - | GUI |
discoverer information:
| discoverer code | discoverer | reference |
| BU 669 | Burnham, S.W. | - |
| GUI | Guillaume, J. |
notes:
| note | Omega (1) Cyg. |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 20h 28min 30.5sec | DEC: +48° 46' 58'' |
variability informations:
| variability type | BCEP: | pulsating variable star |
| magnitute at max. brightness | 4.86 | |
| magnitute amplitude | 0.03 | |
| photometric system |
references
| to a study | M.Jerzykiewicz, AsAp Suppl 97, No.2, 421, 1993. |
| to a chart/photograph | no chart is avaible, but the star is contained in the 'Bonner Durchmusterung' |
miscanellous
| ID in the GCVS catalogue | 31/2014 |
| constellation | Cygnus |
| notes on existence | The star is equivalent to '72455'. |
variability type description
| variability type | description |
| BCEP | Variables of the Beta Cephei type (Beta Cep, Beta CMa), which are pulsating O8-B6 I-V stars with periods of light and radial-velocity variations in the range of 0.1 - 0.6 days and light amplitudes from 0.01 to 0.3 mag in V. The light curves are similar in shape to average radial-velocity curves but lag in phase by a quarter of the period, so that maximum brightness corresponds to maximum contraction, i.e., to minimum stellar radius. The majority of these stars probably show radial pulsations, but some (V649 Per) display nonradial pulsations; multiperiodicity is characteristic of many of these stars. |