y Cygni
| catalogues and names | y Cyg, 24 Cyg, HR 7619, HD 189037, SAO 32114, WDS 19556+5226A |
| constellation | Cygnus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 19h 55min 37,8sec | DEC: +52° 26' 20'' |
| position (J1900) | RA: 19h 53min 2,6sec | DEC: +52° 10' 24'' |
| proper motion (J2000) | RA: -0,037 arcsec/a | DEC: -0,03 arcsec/a |
| radial velocity | -10 km/s note: variable radial velocity |
|
| rotational velocity | 276 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,005 arcsec | |
| note (category: dynamical parallaxes): | 0.008". |
magnitude
| visual magnitude | 4,92 (V on UBV Johnson system) |
spectral / color information
| spectral class | A4Vn |
| B-V-magnitude | 0,12 |
| U-B-magnitude | 0,06 |
| R-I-magnitude | 0,06 |
double/multiple star system information
| number of components of multiple star system | 4 |
| separation | 3,1 arcsec |
| mag difference (of double or brightest multiple) | 2,3 |
| component ID | AB |
| note (category: double and multiple data): | AB combined mag., colors. Sources differ on spectral class of component B from A7V to F4V. vsini of B, 120k/s. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 19h 55min 37,836sec | DEC: +52° 26' 21,38'' | ±0,43 arcsec | source: 16 |
| proper motion (J2000) | RA: -0,003 arcsec/a | DEC: -0,006 arcsec/a | source: 25 | |
| radial velocity | -10 km/s | source: 25 | ||
| trigonometric parallax | 0,005 | - | source: 25 | |
| galactic coord. (B1950) | longitude: 86,11° | latitude: 12,21° | ||
| GCI unit vector (J2000) | X: 0,294681 | Y: -0,533646 | Z: 0,792708 | |
magnitude:
| visual | 4,92 (observed) | source: 25 |
| photovisual | 4,8 | source: 2 |
| photographic | 4,9 | source: 16 |
spectral information:
| spectral class | A3 | source: 96 | |
| Morgan-Keenan | A4Vn | source: 25 | |
| B-magnitude | 5,04 ±0,05 | B-V-magnitude | 0,12 |
| U-magnitude | 5,1 ±0,05 | U-B-magnitude | 0,06 |
double/multiple star system information:
| separation between brightest and second brightest component | 3,1 arcsec |
| magnitude difference between brightest and second brightest component | 2,2 |
| position angle | 176 ° |
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 54min 20,175sec | DEC: +52° 18' 19,76'' | ±0,008 arcsec |
| position (J2000) | RA: 19h 55min 37,774sec | DEC: +52° 26' 20,22'' | |
| proper motion J1950 (FK4) | RA: -0,0045 arcsec/a | DEC: -0,028 arcsec/a | ±0,002 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,004 arcsec/a | DEC: -0,03 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4,8 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | A3 |
| source of spectral data | Taken from the HD with M stars reclassified by Miss Cannon. |
catalogues
| source catalogue | FK3, catalogue number: 750 |
| Durchmusterung | BD+52 2572 |
| Boss General Catalogue | 27618 |
| Henry Draper Catalogue | 189037 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 19h 55,6min | DEC: +52° 26' |
| proper motion (J2000) | RA: -0,036 arcsec/a | DEC: -0,03 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 | 1822 | 77 | 185° | 3,4'' | 5 | 7,2 | A4Vn | STF2605 |
| 1980 | 176° | 3,1'' | ||||||
| AC | 1908 | 2 | 55° | 18,8'' | 4,8 | 13,6 | - | STF2605 |
| 1958 | - | 21,3'' | ||||||
| AD | 1880 | 2 | 62° | 163,2'' | 4,8 | 10,2 | - | STF2605 |
| 1908 | 61° | 165,4'' |
discoverer information:
| discoverer code | discoverer | reference |
| STF2605 | Struve, F.G.W. | - |
notes:
| note | Psi Cyg. |