g Doradus
catalogues and names
| catalogues and names | g Dor, gam Dor, HR 1338, HD 27290, SAO 233457, CD -51 1066, FK5: 157 |
| constellation | Dorado |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 4h 16min 1.6sec | DEC: -51° 29' 12'' | ||
| position (2000.73) | RA: 4h 16min 3sec | DEC: -51° 29' 5'' | ||
| position (B1900) | RA: 4h 13min 24.3sec | DEC: -51° 44' 19'' | ||
| proper motion (J2000) | RA: 0.106 arcsec/a | DEC: 0.182 arcsec/a | ||
| radial velocity | 25 km/s note: suspected variable radial velocity |
|||
| rotational velocity | 69 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.061 arcsec | |||
| galactic coordinates | longitude: 259.84° | latitude: -44.79° | ||
magnitude
| visual magnitude | 4.25 (V on UBV Johnson system) |
spectral / color information
| spectral class | F4III |
| B-V-magnitude | 0.3 |
| U-B-magnitude | 0.03 |
| R-I-magnitude |
| note (category: spectra): | Also classified F0V-F5V. |
variability information
| variable star identification | Gam Dor |
| note (category: variability): | EW? or Delta Sct? 4.23 - 4.27V, per. between 0.33 and 1.0d. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 4h 16min 1.601sec | DEC: -51° 29' 11.93'' | ±0.06 arcsec | source: 15 |
| position (2000.73) | RA: 4h 16min 3sec | DEC: -51° 29' 5'' | JD: 2451810.11 | |
| proper motion (J2000) | RA: 0.0113 arcsec/a | DEC: 0.182 arcsec/a | source: 25 | |
| radial velocity | 25 km/s | source: 25 | ||
| trigonometric parallax | 0.061 arcsec | ±0.006 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 259.84° | latitude: -44.79° | ||
magnitude:
| visual | 4.25 (observed) | source: 25 |
| photovisual | 4.4 | source: 2 |
| photographic | 4.8 | source: 2 |
spectral information:
| spectral class | F5 | source: 96 | |
| Morgan-Keenan | F0V | source: 25 | |
| B-magnitude | 4.55 ±0.05 | B-V-magnitude | 0.3 |
| U-magnitude | 4.58 ±0.05 | U-B-magnitude | 0.03 |
variability information:
| variability type | 330 |
| var. amplitude | 0.04 |
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 | |
| 30 | GCVS, 4th edition |
| Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88 | |
| 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: 4h 14min 42.867sec | DEC: -51° 36' 42.99'' | ±0.011 arcsec |
| position (2000.73) | RA: 4h 16min 2sec | DEC: -51° 29' 15'' | JD: 2451810.11 |
| position (J2000) | RA: 4h 16min 1.654sec | DEC: -51° 29' 11.69'' | |
| proper motion B1950 (FK4) | RA: 0.0113 arcsec/a | DEC: 0.189 arcsec/a | ±0.003 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0119 arcsec/a | DEC: 0.185 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.4 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | F5 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 157 |
| Durchmusterung | CD-51 1066 |
| Boss General Catalogue | 5179 |
| Henry Draper Catalogue | 27290 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 4h 14min 42.9sec | DEC: -51° 36' 43'' |
variability informations:
| variability type | EW: | close binary eclipsing system |
| magnitute at max. brightness | 4.23 | |
| magnitute at min. brightness | 4.27 | |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | F0V-F5V |
references
| to a study | Vol. I GCVS (see Kholopov et al. 1985-1988) |
| to a chart/photograph | no chart is avaible, but the star is contained in the '' |
miscanellous
| ID in the GCVS catalogue | 33/9003 |
| constellation | Dorado |
| notes on existence | The star is equivalent to '1 R Dra'. |
variability type description
| variability type | description |
| EW | Eclipsing binary systems. These are binary systems with orbital planes so close to the observer's line of sight (the inclination i of the orbital plane to the plane orthogonal to the line of sight is close to 90 deg) that the components periodically eclipse each other. Consequently, the observer finds changes of the apparent combined brightness of the system with the period coincident with that of the components' orbital motion. EA Algol (Beta Persei)-type eclipsing systems. Binaries with spherical or slightly ellipsoidal components. It is possible to specify, for their light curves, the moments of the beginning and end of the eclipses. Between eclipses the light remains almost constant or varies insignificantly because of reflection effects, slight ellipsoidality of components, or physical variations. Secondary minima may be absent. An extremely wide range of periods is observed, from 0.2 to >= 10000 days. Light amplitudes are also quite different and may reach several magnitudes. EB Beta Lyrae-type eclipsing systems. These are eclipsing systems having ellipsoidal components and light curves for which it is impossible to specify the exact times of onset and end of eclipses because of a continuous change of a system's apparent combined brightness between eclipses; secondary minimum is observed in all cases, its depth usually being considerably smaller than that of the primary minimum; periods are mainly longer than 1 day. The components generally belong to early spectral types (B-A). Light amplitudes are usually <2 mag in V. EW W Ursae Majoris-type eclipsing variables. These are eclipsers with periods shorter than 1 days, consisting of ellipsoidal components almost in contact and having light curves for which it is impossible to specify the exact times of onset and end of eclipses. The depths of the primary and secondary minima are almost equal or differ insignificantly. Light amplitudes are usually <0.8 mag in V. The components generally belong to spectral types F-G and later. |