TU Camelopardalis
catalogues and names
| catalogues and names | TU Cam, 31 Cam, HR 2027, HD 39220, SAO 25447, BD +59 920, FK5: 2446 |
| constellation | Camelopardalis |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 5h 54min 57.8sec | DEC: +59° 53' 18'' | ||
| position (2000.73) | RA: 5h 55min 2sec | DEC: +59° 53' 18'' | ||
| position (B1900) | RA: 5h 46min 0.3sec | DEC: +59° 51' 57'' | ||
| proper motion (J2000) | RA: 0.001 arcsec/a | DEC: -0.019 arcsec/a | ||
| radial velocity | -3 km/s note: spectroscopic binaries, double lined spectra note: orbital data avaible |
|||
| rotational velocity | 76 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.009 arcsec | |||
| galactic coordinates | longitude: 153.44° | latitude: 16.59° | ||
magnitude
| visual magnitude | 5.2 (V on UBV Johnson system) |
spectral / color information
| spectral class | A2V |
| B-V-magnitude | 0.02 |
| U-B-magnitude | 0.03 |
variability information
| variable star identification | TU Cam |
| note (category: variability): | EB 5.12 - 5.29V, 2.933241d. |
double/multiple star system information
| note (category: spectroscopic binaries): | 2.9333d, K 78.0k/s, V0 -4.0k/s, asini 3.15. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 5h 54min 57.827sec | DEC: +59° 53' 18.12'' | ±0.22 arcsec | source: 15 |
| position (2000.73) | RA: 5h 55min 2sec | DEC: +59° 53' 18'' | JD: 2451810.11 | |
| proper motion (J2000) | RA: 0.0001 arcsec/a | DEC: -0.019 arcsec/a | source: 25 | |
| radial velocity | -3 km/s | source: 25 | ||
| trigonometric parallax | 0.009 arcsec | ±0.001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 153.44° | latitude: 16.59° | ||
magnitude:
| visual | 5.2 (observed) | source: 25 |
| photovisual | 5.3 | source: 2 |
spectral information:
| spectral class | A0 | source: 96 | |
| Morgan-Keenan | A2V | source: 25 | |
| B-magnitude | 5.21 ±0.05 | B-V-magnitude | 0.01 |
| U-magnitude | 5.24 ±0.05 | U-B-magnitude | 0.03 |
variability information:
| variability type | 10 |
| var. amplitude | 0.17 |
| var. period | 2.93 |
| var. epoch | 2438051 21. January 1963, 12:00:00 UT |
| next max light | 2451810.28 22. September 2000, 18:43:12 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 (B1950) | RA: 5h 50min 28.948sec | DEC: +59° 52' 47.19'' | ±0.014 arcsec |
| position (2000.73) | RA: 5h 55min 2sec | DEC: +59° 53' 19'' | JD: 2451810.11 |
| position (J2000) | RA: 5h 54min 57.79sec | DEC: +59° 53' 17.96'' | |
| proper motion B1950 (FK4) | RA: 0.0001 arcsec/a | DEC: -0.019 arcsec/a | ±0.003 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0002 arcsec/a | DEC: -0.02 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.3 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | A0 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 7402 |
| Durchmusterung | BD+59 920 |
| Boss General Catalogue | 7402 |
| Henry Draper Catalogue | 39220 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 5h 50min 28.9sec | DEC: +59° 52' 47'' |
variability informations:
| variability type | EB/DM | close binary eclipsing system |
| magnitute at max. brightness | 5.12 | |
| magnitute at min. brightness | 5.29 | |
| photometric system | visual, photovisual or Johnson's V | |
| epoch for maximum light [JD] | 2438051.375 21. January 1963, 21:00:00 UT |
|
| period [d] | 2.933241 | |
| next maximum light [JD] | 2451811.208531 23. September 2000, 17:00:17 UT |
spectral information
| spectral class | A0IV-V |
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 'Bonner Durchmusterung' |
miscanellous
| ID in the GCVS catalogue | 11/28 |
| constellation | Camelopardalis |
| notes on existence | The star is equivalent to '0110029 TV'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| EB | 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. |
| DM | Detached main-sequence systems. Both components are main-sequence stars and do not fill their inner Roche lobes. |