e Draconis
catalogues and names
| catalogues and names | e Dra, NSV 12465, 63 Dra, HR 7582, HD 188119, SAO 9540, BD +69 1070, WDS 19482+7016 |
| constellation | Draco |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | Tyl. |
position, motion, parallax:
| position (J2000) | RA: 19h 48min 10.4sec | DEC: +70° 16' 4'' | ||
| position (B1900) | RA: 19h 48min 30.7sec | DEC: +70° 0' 48'' | ||
| proper motion (J2000) | RA: 0.082 arcsec/a | DEC: 0.037 arcsec/a | ||
| radial velocity | 3 km/s note: spectroscopic binaries |
|||
| rotational velocity | <19 km/s | |||
| trigonometric parallax | 0.016 arcsec | |||
| galactic coordinates | longitude: 102.43° | latitude: 20.83° | ||
| note (category: dynamical parallaxes): | 0.012". |
magnitude
| visual magnitude | 3.83 (V on UBV Johnson system) |
spectral / color information
| spectral class | G7IIIbCN-2 |
| B-V-magnitude | 0.89 |
| U-B-magnitude | 0.52 |
| R-I-magnitude | |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
variability information
| variable star identification | 12465 |
double/multiple star system information
| separation | 3.2 arcsec |
| mag difference (of double or brightest multiple) | 3.2 |
| note (category: double and multiple data): | Binary, companion K5III (AJ, 82, 431, 1977). However, Buscombe points out that the companion is F6V and this is more consistent with the magnitude difference between the components, if physical. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 19h 48min 10.357sec | DEC: +70° 16' 4.58'' | ±0.35 arcsec | source: 17 |
| proper motion (J2000) | RA: 0.0157 arcsec/a | DEC: 0.04 arcsec/a | source: 25 | |
| radial velocity | 3 km/s | source: 25 | ||
| trigonometric parallax | 0.016 arcsec | ±0.002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 102.43° | latitude: 20.83° | ||
magnitude:
| visual | 3.83 (observed) | source: 25 |
| photovisual | 4 | source: 2 |
| photographic | 5 | source: 16 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | G7IIIbFe-1 | source: 25 | |
| B-magnitude | 4.72 ±0.05 | B-V-magnitude | 0.89 |
| U-magnitude | 5.24 ±0.05 | U-B-magnitude | 0.52 |
double/multiple star system information:
| separation between brightest and second brightest component | 3.1 arcsec |
| magnitude difference between brightest and second brightest component | 3.2 |
| position angle | 16 ° |
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 (B1950) | RA: 19h 48min 21.063sec | DEC: +70° 8' 26.55'' | ±0.007 arcsec |
| position (J2000) | RA: 19h 48min 10.389sec | DEC: +70° 16' 4.29'' | |
| proper motion B1950 (FK4) | RA: 0.0154 arcsec/a | DEC: 0.039 arcsec/a | ±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0161 arcsec/a | DEC: 0.037 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | K0 |
| source of spectral data | Taken from the HD with M stars reclassified by Miss Cannon. |
catalogues
| source catalogue | FK3, catalogue number: 747 |
| Durchmusterung | BD+69 1070 |
| Boss General Catalogue | 27471 |
| Henry Draper Catalogue | 188119 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 19h 48.2min | DEC: +70° 16' |
| proper motion (J2000) | RA: 0.08 arcsec/a | DEC: 0.04 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 |
| - | 1830 | often | 354° | 2.8'' | 3.9 | 7.1 | G7IIIb | STF2603 |
| 1976 | 16° | 3.1'' |
discoverer information:
| discoverer code | discoverer | reference |
| STF2603 | Struve, F.G.W. | - |
notes:
| note | Epsilon Dra. A spectroscopic binary. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 19h 48min 21.1sec | DEC: +70° 8' 27'' |
variability informations:
| magnitute at max. brightness | 3.82 |
| magnitute at min. brightness | 3.89 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | G7 |
references
| to a study | 290477D (designation: ZI 1833) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |