V2133 Ophiuchi
catalogues and names
| catalogues and names | V2133 Oph, 12 Oph, HR 6171, HD 149661, SAO 141269, BD -2 4211, FK5: 1433 |
| constellation | Ophiuchus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | Also BD -1d3220. |
position, motion, parallax:
| position (J2000) | RA: 16h 36min 21.5sec | DEC: -2° 19' 29'' | ||
| position (B1900) | RA: 16h 31min 6.2sec | DEC: -2° 6' 40'' | ||
| proper motion (J2000) | RA: 0.458 arcsec/a | DEC: -0.31 arcsec/a | ||
| radial velocity | -15 km/s note: variable radial velocity |
|||
| trigonometric parallax | 0.093 arcsec | |||
| galactic coordinates | longitude: 13.73° | latitude: 28.42° | ||
magnitude
| visual magnitude | 5.75 (V on UBV Johnson system) |
spectral / color information
| spectral class | K2V |
| B-V-magnitude | 0.82 |
| U-B-magnitude | 0.48 |
| R-I-magnitude |
| note (category: colors): | UV deficient. |
variability information
| variable star identification | V2133 Oph |
| note (category: variability): | Amp. 0.04: at wavelength 4530; 0.02: at 6585. Rotation period from starspots, 11d. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 16h 36min 21.455sec | DEC: -2° 19' 28.6'' | ±0.06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0.0305 arcsec/a | DEC: -0.31 arcsec/a | source: 25 | |
| radial velocity | -15 km/s | source: 25 | ||
| trigonometric parallax | 0.093 arcsec | ±0.009 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 13.73° | latitude: 28.42° | ||
magnitude:
| visual | 5.75 (observed) | source: 25 |
| photovisual | 5.9 | source: 2 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | K2V | source: 25 | |
| B-magnitude | 6.57 ±0.05 | B-V-magnitude | 0.82 |
| U-magnitude | 7.05 ±0.05 | U-B-magnitude | 0.48 |
variability information:
| variability type | 440 |
| var. amplitude | 0 |
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 | |
| 27 | Catalog of Red Magnitudes (CRM) |
| Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 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: 16h 33min 43.676sec | DEC: -2° 13' 10.02'' | ±0.006 arcsec |
| position (J2000) | RA: 16h 36min 21.454sec | DEC: -2° 19' 28.7'' | |
| proper motion B1950 (FK4) | RA: 0.0303 arcsec/a | DEC: -0.315 arcsec/a | ±0.002 arcsec/a in RA ±0.001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0306 arcsec/a | DEC: -0.311 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.9 (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 Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 1433 |
| Durchmusterung | BD-02 4211 |
| Boss General Catalogue | 22321 |
| Henry Draper Catalogue | 149661 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 16h 33min 43.7sec | DEC: -2° 13' 10'' |
variability informations:
| variability type | BY | rotating variable star |
| magnitute at max. brightness | 6.57 | |
| magnitute amplitude | 0.04 | |
| photometric system |
references
| to a study | J.D.Dorren, E.F.Guinan, AJ 87,1546,1982. |
| to a chart/photograph | no chart is avaible, but the star is contained in the 'Bonner Durchmusterung' |
miscanellous
| ID in the GCVS catalogue | 59/2133 |
| constellation | Ophiuchus |
| notes on existence | The star is equivalent to '67369'. |
variability type description
| variability type | description |
| BY | BY Draconis-type variables, which are emission-line dwarfs of dKe-dMe spectral type showing quasiperiodic light changes with periods from a fraction of a day to 120 days and amplitudes from several hundredths to 0.5 mag in V. The light variability is caused by axial rotation of a star with a variable degree of nonuniformity of the surface brightness (spots) and chromospheric activity. Some of these stars also show flares similar to those of UV Cet stars, and in those cases they also belong to the latter type and are simultaneously considered eruptive variables. |