b Doradus
| catalogues and names | b Dor, bet Dor, HR 1922, HD 37350, SAO 249311, FK5: 212 |
| constellation | Dorado |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 5h 33min 37,5sec | DEC: -62° 29' 23'' |
| position (J1900) | RA: 5h 32min 45,4sec | DEC: -62° 33' 19'' |
| proper motion (J2000) | RA: 0,002 arcsec/a | DEC: 0,009 arcsec/a |
| radial velocity | 7 km/s note: variable radial velocity |
|
| rotational velocity | 0 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,012 arcsec | |
| note (category: radial and/or rotational velocities): | Same period, originally considered SB in 1924; later identified as pulsating. |
magnitude
| visual magnitude | 3,76 (V on UBV Johnson system) |
spectral / color information
| spectral class | F6Ia |
| B-V-magnitude | 0,82 |
| U-B-magnitude | 0,55 |
| R-I-magnitude | 0,43 |
| note (category: spectra): | Also classified F4-G4Ia-II. |
variability information
| variable star identification | Bet Dor |
| note (category: variability): | CDelta 3.46 - 4.08V, 9.84200d. Period varies. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 5h 33min 37,514sec | DEC: -62° 29' 23,48'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,0003 arcsec/a | DEC: 0,009 arcsec/a | source: 25 | |
| radial velocity | 7 km/s | source: 25 | ||
| trigonometric parallax | 0,012 | ±0,001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 271,73° | latitude: -32,77° | ||
| GCI unit vector (J2000) | X: 0,05304 | Y: 0,45885 | Z: -0,886929 | |
magnitude:
| visual | 3,46 (observed) | source: 30 |
| photovisual | 3,8 | source: 2 |
| photographic | 4,2 | source: 2 |
spectral information:
| spectral class | F5 | source: 96 | |
| Morgan-Keenan | F6Ia | source: 25 | |
| B-magnitude | 4,58 ±0,05 | B-V-magnitude | 0,82 |
| U-magnitude | 5,13 ±0,05 | U-B-magnitude | 0,55 |
variability information:
| variability type | 111 |
| var. amplitude | 0,62 |
| var. period | 9,84 |
| var. epoch | 2440905 14. November 1970, 12:00:00 UT |
| next max light | 2451620,76 17. March 2000, 06:14:24 UT |
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 (J1950) | RA: 5h 33min 11,331sec | DEC: -62° 31' 20,2'' | ±0,011 arcsec |
| position (J2000) | RA: 5h 33min 37,513sec | DEC: -62° 29' 23,65'' | |
| proper motion J1950 (FK4) | RA: 0,0002 arcsec/a | DEC: 0,007 arcsec/a | ±0,003 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0003 arcsec/a | DEC: 0,007 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3,8 (accuracy: 2 decimals) |
| source of visual magnitude data | Arithmetic mean of maximum and minimum magnitudes of a variable star |
spectral information:
| spectral class | F5p |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
remarks for duplicity and variability
| Variable star in visual magnitude in source catalog |
catalogues
| source catalogue | FK4, catalogue number: 212 |
| Durchmusterung | CP-62 487 |
| Boss General Catalogue | 6944 |
| Henry Draper Catalogue | 37350 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (J1950) | RA: 5h 33min 11,3sec | DEC: -62° 31' 20'' |
variability informations:
| variability type | DCEP | pulsating variable star |
| magnitute at max. brightness | 3,46 | |
| magnitute at min. brightness | 4,08 | |
| photometric system | visual, photovisual or Johnson's V | |
| epoch for maximum light [JD] | 2440905,3 14. November 1970, 19:12:00 UT |
|
| period [d] | 9,8426 | |
| next maximum light [JD] | 2451623,8914 20. March 2000, 09:23:37 UT |
|
| rising time | 48 % of period |
spectral information
| spectral class | F4-G4Ia-II |
references
| to a study | Vol. I GCVS (see Kholopov et al. 1985-1988) |
| to a chart/photograph | Vol. I GCVS (see Kholopov et al. 1985-1988) |
miscanellous
| ID in the GCVS catalogue | 33/9002 |
| constellation | Dorado |
| notes on existence | The star is equivalent to '0339003 gam'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| DCEP | These are the classical cepheids, or Delta Cep-type variables. Comparatively young objects that have left the main sequence and evolved into the instability strip of the Hertzsprung-Russell (H-R) diagram, they obey the well-known Cepheid period-luminosity relation and belong to the young disk population. DCEP stars are present in open clusters. They display a certain relation between the shapes of their light curves and their periods. |