d Cygni
| catalogues and names | d Cyg, NSV 12381, 18 Cyg, HR 7528, HD 186882, SAO 48796, WDS 19450+4508A |
| constellation | Cygnus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 19h 44min 58,5sec | DEC: +45° 7' 51'' |
| position (J1900) | RA: 19h 41min 50,9sec | DEC: +44° 53' 12'' |
| proper motion (J2000) | RA: 0,053 arcsec/a | DEC: 0,047 arcsec/a |
| radial velocity | -20 km/s note: spectroscopic binaries |
|
| rotational velocity | 149 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,03 arcsec | |
| note (category: dynamical parallaxes): | 0.021". |
magnitude
| visual magnitude | 2,87 (V on UBV Johnson system) |
spectral / color information
| spectral class | B9.5IV+F1V |
| B-V-magnitude | -0,03 |
| U-B-magnitude | -0,1 |
| R-I-magnitude | -0,02 |
| note (category: colors): | Color excess E(B-V) = +0.05. |
variability information
| variable star identification | 12380/1 |
| note (category: variability): | ADS 12880A is NSV 12381, 2.85 - 2.89V. Component B is NSV 12380, 6.5 ->8.5v. |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 2 arcsec |
| mag difference (of double or brightest multiple) | 3,5 |
| component ID | AB |
| note (category: double and multiple data): | AB 2.91 B9.5III, 6.33 F1V, 827.6y, a = 3.20". |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 19h 44min 58,588sec | DEC: +45° 7' 50,46'' | ±0,43 arcsec | source: 16 |
| proper motion (J2000) | RA: 0,0054 arcsec/a | DEC: 0,039 arcsec/a | source: 25 | |
| radial velocity | -20 km/s | source: 25 | ||
| trigonometric parallax | 0,03 | ±0,003 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 78,71° | latitude: 10,24° | ||
| GCI unit vector (J2000) | X: 0,311966 | Y: -0,632769 | Z: 0,708718 | |
magnitude:
| visual | 2,87 (observed) | source: 25 |
| photovisual | 3 | source: 2 |
| photographic | 3 | source: 16 |
spectral information:
| spectral class | A0 | source: 96 | |
| Morgan-Keenan | B9.5IV+F1V | source: 25 | |
| B-magnitude | 2,84 ±0,05 | B-V-magnitude | -0,03 |
| U-magnitude | 2,74 ±0,05 | U-B-magnitude | -0,1 |
double/multiple star system information:
| separation between brightest and second brightest component | 2,5 arcsec |
| magnitude difference between brightest and second brightest component | 5 |
| position angle | 229 ° |
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 | |
| 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: 19h 43min 24,671sec | DEC: +45° 0' 28,23'' | ±0,007 arcsec |
| position (J2000) | RA: 19h 44min 58,535sec | DEC: +45° 7' 50,66'' | |
| proper motion J1950 (FK4) | RA: 0,0046 arcsec/a | DEC: 0,049 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,005 arcsec/a | DEC: 0,048 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | A0 |
| source of spectral data | Taken from the HD with M stars reclassified by Miss Cannon. |
catalogues
| source catalogue | FK3, catalogue number: 742 |
| Durchmusterung | BD+44 3234 |
| Boss General Catalogue | 27347 |
| Henry Draper Catalogue | 186882 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 19h 45min | DEC: +45° 8' |
| proper motion (J2000) | RA: 0,051 arcsec/a | DEC: 0,05 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 | 1826 | often | 41° | 1,8'' | 2,87 | 7,9 | B9.5IV | STF2579 |
| 1990 | 229° | 2,5'' | ||||||
| AC | 1913 | 2 | 66° | 68,2'' | 3 | 12 | - | STF2579 |
| 1960 | - | 65,7'' |
discoverer information:
| discoverer code | discoverer | reference |
| STF2579 | Struve, F.G.W. | - |
notes:
| note | Delta Cyg. P = 780yr., a = 3.00", motion retrograde. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (J1950) | RA: 19h 43min 24,7sec | DEC: +45° 0' 28'' |
variability informations:
| magnitute at max. brightness | 2,85 |
| magnitute at min. brightness | 2,89 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | A0 |
references
| to a study | 511703D (designation: DELTA CYG) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |