V1809 Cygni
catalogues and names
| catalogues and names | V1809 Cyg, 68 Cyg, HR 8154, HD 203064, SAO 50690, BD +43 3877, FK5: 3701 |
| constellation | Cygnus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 21h 18min 27.2sec | DEC: +43° 56' 45'' | ||
| position (B1900) | RA: 21h 14min 43.4sec | DEC: +43° 31' 30'' | ||
| proper motion (J2000) | RA: 0.006 arcsec/a | DEC: -0.009 arcsec/a | ||
| radial velocity | 1 km/s note: spectroscopic binaries |
|||
| rotational velocity | 328 km/s (uncertain) (variable) | |||
| galactic coordinates | longitude: 87.61° | latitude: -3.84° | ||
magnitude
| visual magnitude | 5 (V on UBV Johnson system) |
spectral / color information
| spectral class | O7.5III:n((f)) |
| B-V-magnitude | -0.01 |
| U-B-magnitude | -0.94 |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
| note (category: spectra): | Also classified O8V and O8III((f)). H alpha emission moderately intense 1959 to 1970; absorption increasing 1973-1976. |
variability information
| variable star identification | V1809 Cyg |
| note (category: variability): | 5.05 - 5.075V, 3.390d. |
miscellaneous information
| note (category: group membership): | Cyg OB7; exciting star of HII region S119. Runaway star from Cep OB2 association? |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 21h 18min 27.188sec | DEC: +43° 56' 45.42'' | ±0.22 arcsec | source: 15 |
| proper motion (J2000) | RA: 0.0005 arcsec/a | DEC: -0.009 arcsec/a | source: 25 | |
| radial velocity | 1 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 87.62° | latitude: -3.84° | ||
magnitude:
| visual | 5 (observed) | source: 25 |
| photovisual | 5.1 | source: 2 |
spectral information:
| spectral class | O0 | source: 96 | |
| Morgan-Keenan | O7.5III:n((f)) | source: 25 | |
| B-magnitude | 4.99 ±0.05 | B-V-magnitude | -0.01 |
| U-magnitude | 4.05 ±0.05 | U-B-magnitude | -0.94 |
variability information:
| variability type | 430 |
| var. amplitude | 0.1 |
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 | |
| 27 | Catalog of Red Magnitudes (CRM) |
| Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 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 16min 35.131sec | DEC: +43° 44' 5.24'' | ±0.016 arcsec |
| position (J2000) | RA: 21h 18min 27.149sec | DEC: +43° 56' 45.38'' | |
| proper motion B1950 (FK4) | RA: -0.0001 arcsec/a | DEC: -0.006 arcsec/a | ±0.003 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0002 arcsec/a | DEC: -0.009 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 | Oe5 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 29823 |
| Durchmusterung | BD+43 3877 |
| Boss General Catalogue | 29823 |
| Henry Draper Catalogue | 203064 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 21h 16min 35.1sec | DEC: +43° 44' 5'' |
variability informations:
| variability type | ELL | rotating variable star |
| magnitute at max. brightness | 4.98 | |
| magnitute at min. brightness | 5.09 | |
| photometric system | visual, photovisual or Johnson's V |
references
| to a study | V.F.Esipov, A.Yu.Klementyeva, A.V.Kovalenko, T.A.Lozinskaya, V.M.Lyutyj, T.G.Sitnik, V.A.Udaltsov, Astr Zh (USSR) 59,No.5,965,1982. |
| to a chart/photograph | V.F.Esipov, A.Yu.Klementyeva, A.V.Kovalenko, T.A.Lozinskaya, V.M.Lyutyj, T.G.Sitnik, V.A.Udaltsov, Astr Zh (USSR) 59,No.5,965,1982. |
miscanellous
| ID in the GCVS catalogue | 31/1809 |
| constellation | Cygnus |
| notes on existence | The star is equivalent to '67618'. |
variability type description
| variability type | description |
| ELL | Rotating ellipsoidal variables (b Per, Alpha Vir). These are close binary systems with ellipsoidal components, which change combined brightnesses with periods equal to those of orbital motion because of changes in emitting areas toward an observer, but showing no eclipses. Light amplitudes do not exceed 0.1 mag in V. |