d1Lyrae
| catalogues and names | d1Lyr, NSV 11504, 11 Lyr, HR 7131, HD 175426, SAO 67537, FK5: 3506, WDS 18537+3658A |
| constellation | Lyra |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 18h 53min 43,6sec | DEC: +36° 58' 18'' |
| position (J1900) | RA: 18h 50min 13,9sec | DEC: +36° 50' 48'' |
| proper motion (J2000) | RA: 0,004 arcsec/a | DEC: -0,002 arcsec/a |
| radial velocity | -26 km/s note: spectroscopic binaries note: orbital data avaible |
|
| rotational velocity | 123 km/s (uncertain) (variable) | |
magnitude
| visual magnitude | 5,58 (V on UBV Johnson system) |
spectral / color information
| spectral class | B2.5V |
| B-V-magnitude | -0,15 |
| U-B-magnitude | -0,66 |
variability information
| variable star identification | 11504 |
double/multiple star system information
| separation | 174,6 arcsec |
| mag difference (of double or brightest multiple) | 3,7 |
| note | Worley (1978) update of the IDS |
| note (category: spectroscopic binaries): | 88.352d, K 39.7k/s, V0 -17.2k/s, asini 44.8. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 18h 53min 43,569sec | DEC: +36° 58' 18,22'' | ±0,22 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,0003 arcsec/a | DEC: -0,002 arcsec/a | source: 25 | |
| radial velocity | -26 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 66,94° | latitude: 15,49° | ||
| GCI unit vector (J2000) | X: 0,185579 | Y: -0,77708 | Z: 0,601421 | |
magnitude:
| visual | 5,58 (observed) | source: 25 |
| photovisual | 5,5 | source: 2 |
spectral information:
| spectral class | B3 | source: 96 | |
| Morgan-Keenan | B2.5V | source: 25 | |
| B-magnitude | 5,43 ±0,05 | B-V-magnitude | -0,15 |
| U-magnitude | 4,77 ±0,05 | U-B-magnitude | -0,66 |
double/multiple star system information:
| separation between brightest and second brightest component | 174,6 arcsec |
| magnitude difference between brightest and second brightest component | 3,6 |
| position angle | 20 ° |
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 | |
| 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: 18h 51min 58,671sec | DEC: +36° 54' 29,16'' | ±0,017 arcsec |
| position (J2000) | RA: 18h 53min 43,564sec | DEC: +36° 58' 18,11'' | |
| proper motion J1950 (FK4) | RA: -0,0001 arcsec/a | DEC: -0,003 arcsec/a | ±0,003 arcsec/a in RA ±0,003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0002 arcsec/a | DEC: -0,003 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5,5 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | B3 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 25934 |
| Durchmusterung | BD+36 3307 |
| Boss General Catalogue | 25934 |
| Henry Draper Catalogue | 175426 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 18h 53,7min | DEC: +36° 58' |
| proper motion (J2000) | RA: 0,004 arcsec/a | DEC: -0,002 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 |
| - | 1905 | 1 | 20° | 174,6'' | 5,58 | 9,2 | B2.5V | H 3 |
discoverer information:
| discoverer code | discoverer | reference |
| H 3 | Herschel, W. | - |
notes:
| note | H VI 3. Delta (1) Lyr. A is a spectroscopic binary. B is BD+36@3308. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (J1950) | RA: 18h 51min 58,7sec | DEC: +36° 54' 29'' |
variability informations:
| magnitute at max. brightness | 5,56 |
| magnitute at min. brightness | 5,62 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | B3 |
references
| to a study | 290477D (designation: ZI 1554) |
| to a chart/photograph | 682064 |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |