n1Draconis
| catalogues and names | n1Dra, NSV 09163, 24 Dra, HR 6554, HD 159541, SAO 30447, FK5: 655, WDS 17323+5510B |
| constellation | Draco |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 17h 32min 10,6sec | DEC: +55° 11' 3'' |
| position (J1900) | RA: 17h 30min 12,3sec | DEC: +55° 15' 9'' |
| proper motion (J2000) | RA: 0,147 arcsec/a | DEC: 0,057 arcsec/a |
| radial velocity | -15 km/s note: spectroscopic binaries |
|
| rotational velocity | 66 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,035 arcsec | |
magnitude
| visual magnitude | 4,88 (V on UBV Johnson system) |
spectral / color information
| spectral class | A6V |
| B-V-magnitude | 0,26 |
| U-B-magnitude | 0,04 |
| R-I-magnitude | 0,13 |
| note (category: spectra): | Also classified Am(A4/F1V/F1). |
variability information
| variable star identification | 9163 |
| note (category: variability): | ADS 10628B, I, 4.84 - 4.91V. |
double/multiple star system information
| separation | 62,3 arcsec |
| mag difference (of double or brightest multiple) | 0 |
| note (category: double and multiple data): | Binary with HR 6555. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 17h 32min 10,554sec | DEC: +55° 11' 3,41'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,0172 arcsec/a | DEC: 0,057 arcsec/a | source: 25 | |
| radial velocity | -15 km/s | source: 25 | ||
| trigonometric parallax | 0,035 | ±0,003 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 83,03° | latitude: 33,14° | ||
| GCI unit vector (J2000) | X: -0,069145 | Y: -0,566736 | Z: 0,820993 | |
magnitude:
| visual | 4,88 (observed) | source: 25 |
| photovisual | 5 | source: 2 |
spectral information:
| spectral class | A5 | source: 96 | |
| Morgan-Keenan | A6V | source: 25 | |
| B-magnitude | 5,14 ±0,05 | B-V-magnitude | 0,26 |
| U-magnitude | 5,18 ±0,05 | U-B-magnitude | 0,04 |
double/multiple star system information:
| separation between brightest and second brightest component | 62,3 arcsec |
| magnitude difference between brightest and second brightest component | 0 |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 4,87 | A5 | Kuma, n2Draconis, 25 Dra, HR 6555, HD 159560, SAO 30450 |
| B | 4,88 | A5 | n1Draconis, 24 Dra, HR 6554, HD 159541, SAO 30447 |
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 | |
| 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: 17h 31min 11,293sec | DEC: +55° 13' 4,07'' | ±0,005 arcsec |
| position (J2000) | RA: 17h 32min 10,539sec | DEC: +55° 11' 3,5'' | |
| proper motion J1950 (FK4) | RA: 0,0163 arcsec/a | DEC: 0,055 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,017 arcsec/a | DEC: 0,058 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | A5 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 655 |
| Durchmusterung | BD+55 1944 |
| Boss General Catalogue | 23797 |
| Henry Draper Catalogue | 159541 |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (J1950) | RA: 17h 31min 11,3sec | DEC: +55° 13' 4'' |
variability informations:
| variability type | I | eruptive variable star |
| magnitute at max. brightness | 4,84 | |
| magnitute at min. brightness | 4,91 | |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | AM |
references
| to a study | 742754D (designation: *) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |
variability type description
| variability type | description |
| I |
Poorly studied irregular variables with unknown features of light variations and spectral types. This is a very inhomogeneous group of objects. |