s Cygni
catalogues and names
| catalogues and names | s Cyg, NSV 13640, 67 Cyg, HR 8143, HD 202850, SAO 71165, BD +38 4431, FK5: 1558 |
| constellation | Cygnus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 21h 17min 25sec | DEC: +39° 23' 41'' | ||
| position (B1900) | RA: 21h 13min 29.2sec | DEC: +38° 58' 32'' | ||
| proper motion (J2000) | RA: 0.001 arcsec/a | DEC: -0.003 arcsec/a | ||
| radial velocity | -4 km/s note: spectroscopic binaries |
|||
| rotational velocity | 28 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.011 arcsec | |||
| galactic coordinates | longitude: 84.19° | latitude: -6.87° | ||
magnitude
| visual magnitude | 4.23 (V on UBV Johnson system) |
spectral / color information
| spectral class | B9Iab |
| B-V-magnitude | 0.12 |
| U-B-magnitude | -0.39 |
| R-I-magnitude |
variability information
| variable star identification | 13640 |
| note (category: variability): | H alpha profile varies. |
double/multiple star system information
| note (category: spectroscopic binaries): | 11.043d? |
miscellaneous information
| note (category: group membership): | Cyg OB4; embedded in dust. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 21h 17min 24.953sec | DEC: +39° 23' 40.87'' | ±0.06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0.0001 arcsec/a | DEC: -0.003 arcsec/a | source: 25 | |
| radial velocity | -4 km/s | source: 25 | ||
| trigonometric parallax | 0.011 arcsec | ±0.001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 84.2° | latitude: -6.87° | ||
magnitude:
| visual | 4.23 (observed) | source: 25 |
| photovisual | 4.3 | source: 2 |
spectral information:
| spectral class | A0 | source: 96 | |
| Morgan-Keenan | B9Iab | source: 25 | |
| B-magnitude | 4.35 ±0.05 | B-V-magnitude | 0.12 |
| U-magnitude | 3.96 ±0.05 | U-B-magnitude | -0.39 |
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 | |
| 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: 21h 15min 26.951sec | DEC: +39° 11' 3.5'' | ±0.004 arcsec |
| position (J2000) | RA: 21h 17min 24.949sec | DEC: +39° 23' 40.88'' | |
| proper motion B1950 (FK4) | RA: -0.0002 arcsec/a | DEC: 0 arcsec/a | ±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0 arcsec/a | DEC: -0.003 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.3 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | A0p |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 1558 |
| Durchmusterung | BD+38 4431 |
| Boss General Catalogue | 29786 |
| Henry Draper Catalogue | 202850 |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 21h 15min 27sec | DEC: +39° 11' 4'' |
variability informations:
| magnitute at max. brightness | 4.2 |
| magnitute at min. brightness | 4.26 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | B9 |
references
| to a study | 202357D (designation: SIGMA CYG) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |