15 Lyn
| catalogues and names | 15 Lyn, HR 2560, HD 50522, SAO 26051, WDS 06573+5825A |
| constellation | Lynx |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 6h 57min 16,5sec | DEC: +58° 25' 21'' |
| position (J1900) | RA: 6h 48min 37sec | DEC: +58° 33' 14'' |
| proper motion (J2000) | RA: -0,005 arcsec/a | DEC: -0,135 arcsec/a |
| radial velocity | 9 km/s note: variable radial velocity |
|
| rotational velocity | <25 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,014 arcsec | |
| note (category: dynamical parallaxes): | 0.007". |
magnitude
| visual magnitude | 4,35 (V on UBV Johnson system) |
spectral / color information
| spectral class | G5III-IV |
| B-V-magnitude | 0,85 |
| U-B-magnitude | 0,52 |
| R-I-magnitude | 0,44 |
double/multiple star system information
| number of components of multiple star system | 4 |
| separation | 0,9 arcsec |
| mag difference (of double or brightest multiple) | 1,2 |
| component ID | AB |
| note (category: double and multiple data): | AB binary. C, 13v at 29" optical. D, 9.5 at 207". |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 6h 57min 16,573sec | DEC: +58° 25' 21,64'' | ±0,35 arcsec | source: 17 |
| proper motion (J2000) | RA: -0,0006 arcsec/a | DEC: -0,133 arcsec/a | source: 25 | |
| radial velocity | 9 km/s | source: 25 | ||
| trigonometric parallax | 0,014 | ±0,001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 157,77° | latitude: 23,6° | ||
| GCI unit vector (J2000) | X: -0,129509 | Y: 0,507381 | Z: 0,851934 | |
magnitude:
| visual | 4,35 (observed) | source: 25 |
| photovisual | 4,5 | source: 2 |
| photographic | 5,1 | source: 16 |
spectral information:
| spectral class | G0 | source: 96 | |
| Morgan-Keenan | G5III-IV | source: 25 | |
| B-magnitude | 5,2 ±0,05 | B-V-magnitude | 0,85 |
| U-magnitude | 5,72 ±0,05 | U-B-magnitude | 0,52 |
double/multiple star system information:
| separation between brightest and second brightest component | 0,1 arcsec |
| magnitude difference between brightest and second brightest component | 1 |
| position angle | 66 ° |
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 | |
| 17 | ACRS |
| Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 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 (J1950) | RA: 6h 52min 57,126sec | DEC: +58° 29' 26,92'' | ±0,01 arcsec |
| position (J2000) | RA: 6h 57min 16,538sec | DEC: +58° 25' 21,48'' | |
| proper motion J1950 (FK4) | RA: -0,0003 arcsec/a | DEC: -0,136 arcsec/a | ±0,002 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0006 arcsec/a | DEC: -0,135 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4,5 (accuracy: 2 decimals) |
| source of visual magnitude data | Combined magnitude of component stars. |
spectral information:
| spectral class | G0 |
| source of spectral data | Taken from the HD with M stars reclassified by Miss Cannon. |
remarks for duplicity and variability
| Double star - see source catalog for source |
catalogues
| source catalogue | FK3, catalogue number: 265 |
| Durchmusterung | BD+58 982 |
| Boss General Catalogue | 9082 |
| Henry Draper Catalogue | 50522 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 6h 57,3min | DEC: +58° 25' |
| proper motion (J2000) | RA: -0,005 arcsec/a | DEC: -0,133 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 | 1843 | often | 323° | 0,5'' | 4,7 | 5,7 | G5III-IV | STT 159 |
| 1990 | 66° | 0,1'' | ||||||
| AC | 1878 | 3 | 342° | 23,6'' | 4,7 | 12,4 | - | STT 159 |
| 1924 | 346° | 29'' | ||||||
| AD | 1850 | 6 | 167° | 206,6'' | 4,7 | 8,9 | - | STT 159 |
| 1924 | - | 197,4'' |
discoverer information:
| discoverer code | discoverer | reference |
| STT 159 | Struve, O. | - |
notes:
| note | 15 Lyn. P = 210yr., a = 1.03", motion direct. |