c Draconis
catalogues and names
| catalogues and names | c Dra, NSV 10749, 44 Dra, HR 6927, HD 170153, SAO 9087, BD +72 839, FK5: 695, WDS 18211+7244A |
| constellation | Draco |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 18h 21min 3.4sec | DEC: +72° 43' 58'' | ||
| position (B1900) | RA: 18h 22min 51.5sec | DEC: +72° 41' 22'' | ||
| proper motion (J2000) | RA: 0.532 arcsec/a | DEC: -0.35 arcsec/a | ||
| radial velocity | 33 km/s note: spectroscopic binaries, double lined spectra note: orbital data avaible |
|||
| rotational velocity | 11 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.12 arcsec | |||
| galactic coordinates | longitude: 103.46° | latitude: 28.06° | ||
magnitude
| visual magnitude | 3.57 (V on UBV Johnson system) |
spectral / color information
| spectral class | F7V |
| B-V-magnitude | 0.49 |
| U-B-magnitude | -0.06 |
| R-I-magnitude |
variability information
| variable star identification | 10749 |
double/multiple star system information
| number of components of multiple star system | 4 |
| separation | 0.1 arcsec |
| mag difference (of double or brightest multiple) | 2 |
| component ID | * |
| note | Worley (1978) update of the IDS |
| note (category: double and multiple data): | A* 3.57 F7V, 0.768y, a = 0.124". Masses 1.5 and 1.1 Suns. Shortest known period for astrometric binary. Speckle interferometry indicates component A is binary, sep. about 0.1". B, 12v K1V at 149"; C, 13.5v at 10". |
| note (category: spectroscopic binaries): | 280.531d, K 18.0k/s, V0 +32.5k/s, asini 62.0, i 60.1d. Resolved by speckle interferometry 1986.46, sep. 0.09" (at 7000 Ang.) |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 18h 21min 3.381sec | DEC: +72° 43' 58.33'' | ±0.06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0.1194 arcsec/a | DEC: -0.349 arcsec/a | source: 25 | |
| radial velocity | 33 km/s | source: 25 | ||
| trigonometric parallax | 0.12 arcsec | ±0.012 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 103.46° | latitude: 28.06° | ||
magnitude:
| visual | 3.57 (observed) | source: 25 |
| photovisual | 3.7 | source: 2 |
spectral information:
| spectral class | F8 | source: 96 | |
| Morgan-Keenan | F7V | source: 25 | |
| B-magnitude | 4.06 ±0.05 | B-V-magnitude | 0.49 |
| U-magnitude | 4 ±0.05 | U-B-magnitude | -0.06 |
double/multiple star system information:
| separation between brightest and second brightest component | 0.1 arcsec |
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 (B1950) | RA: 18h 21min 57.479sec | DEC: +72° 42' 42.15'' | ±0.004 arcsec |
| position (J2000) | RA: 18h 21min 3.391sec | DEC: +72° 43' 58.42'' | |
| proper motion B1950 (FK4) | RA: 0.1169 arcsec/a | DEC: -0.356 arcsec/a | ±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.1196 arcsec/a | DEC: -0.349 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3.7 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | F8 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 695 |
| Durchmusterung | BD+72 839 |
| Boss General Catalogue | 25122 |
| Henry Draper Catalogue | 170153 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 18h 21.1min | DEC: +72° 44' |
| proper motion (J2000) | RA: 0.532 arcsec/a | DEC: -0.35 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 |
| Aa | 1973 | 23 | ° | 0.1'' | 3.57 | - | F7V | LAB |
| Aa-B | 1879 | - | 26° | 144.6'' | 3.6 | 11.8 | - | BUP 182 |
| 1908 | 19° | 149.2'' | ||||||
| BC | 1908 | 1 | 302° | 10.2'' | 11.8 | 13.3 | - | BUP 182 |
discoverer information:
| discoverer code | discoverer | reference |
| LAB | Labeyrie et al | |
| BUP 182 | - | - |
notes:
| note | Chi Dra. An astrometric, interferometric, and spectroscopic binary. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 18h 22.9min | DEC: +72° 41' |
magnitudes, spectral classes, orbital elements:
| author: | H.A. McAlister |
| magnitude of component A: | 3.57 |
| magnitude of component B: | 3.57 |
| spectral class component B: | F7V |
| spectral class component B: | F7V |
| period [y]: | 0.768 |
| semi-major axis [arcsec]: | 0.124 |
| inclination [deg]: | 79.9 |
| node [deg]: | 231.8 (ascending) |
| eccentricity: | 0.452 |
| time of periastron passage: | 1979.449 |
| grade: | good |
| reference: | Astron. J. 85, 1265; 1980. |
| notes | Speckle and spectroscopic orbit, P = 280.531 d. The positional elements disagree somewhat with those of the astrometric orbit (prior to resolution of the companion) by Breakiron and Gatewood (Pub. Astron. Soc. Pacific 86, 448; 1974). Discussion of the RV's by J. Vinter Hansen (Lick Obs. Bul. 19, 141; 1942). |
| other name(s) | Chi Dra |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 18h 21min 57.5sec | DEC: +72° 42' 42'' |
variability informations:
| magnitute at max. brightness | 3.51 |
| magnitute at min. brightness | 3.58 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | F7 |
references
| to a study | 730774D (designation: 15693) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |