Al Anz
| catalogues and names | Al Anz, e Aur, eps Aur, 7 Aur, HR 1605, HD 31964, SAO 39955, FK5: 183, WDS 05020+4349A |
| other names | Almaaz |
| constellation | Auriga |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | Al Anz; Almaaz. |
position, motion, parallax:
| position (J2000) | RA: 5h 1min 58,1sec | DEC: +43° 49' 24'' |
| position (J1900) | RA: 4h 54min 47,4sec | DEC: +43° 40' 32'' |
| proper motion (J2000) | RA: -0,001 arcsec/a | DEC: -0,004 arcsec/a |
| radial velocity | -3 km/s note: spectroscopic binaries, single lined spectra note: orbital data avaible |
|
| rotational velocity | 29 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,007 arcsec | |
magnitude
| visual magnitude | 2,99 (V on UBV Johnson system) |
spectral / color information
| spectral class | F0Iae+B |
| B-V-magnitude | 0,54 |
| U-B-magnitude | 0,33 |
| R-I-magnitude | 0,45 |
| note (category: spectra): | Shell star. Also classified A8Ia-F2epIa + B. |
variability information
| variable star identification | Eps Aur |
| note (category: variability): | ADS 3605A, EA 2.94 - 3.83V, 9892d. Spectrum var. even outside eclipse. RV and light fluctuations about 110d. |
double/multiple star system information
| number of components of multiple star system | 6 |
| separation | 207,6 arcsec |
| mag difference (of double or brightest multiple) | 6,2 |
| component ID | AE |
| note (category: double and multiple data): | ADS 3605A. A* 2.98 var. A8Iap. Five visual and one astrometric components. AB visual binary, B, 14v at 29"; C, 11.26V, +1.83(B-V), +1.31(U-B), at 43"; D, 12.0v at 46". |
| note (category: spectroscopic binaries): | ADS 3605A, 9890d, K 15.0k/s, V0 -1.4k/s, msin3i 16.8, asini 2000. Unresolved by speckle interferometry. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 5h 1min 58,133sec | DEC: +43° 49' 23,83'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: -0,0001 arcsec/a | DEC: -0,004 arcsec/a | source: 25 | |
| radial velocity | -3 km/s | source: 25 | ||
| trigonometric parallax | 0,003 | - | source: 25 | |
| galactic coord. (B1950) | longitude: 162,79° | latitude: 1,18° | ||
| GCI unit vector (J2000) | X: 0,180739 | Y: 0,698474 | Z: 0,692436 | |
magnitude:
| visual | 2,9 (observed) | source: 31 |
spectral information:
| spectral class | F5 | source: 96 | |
| Morgan-Keenan | F0Iae+B | source: 25 | |
| B-magnitude | 3,53 ±0,05 | B-V-magnitude | 0,54 |
| U-magnitude | 3,86 ±0,05 | U-B-magnitude | 0,33 |
variability information:
| variability type | 10 |
| var. amplitude | 0,91 |
| var. period | 9892 |
| var. epoch | 2435629 4. June 1956, 12:00:00 UT |
| next max light | 2455413 4. August 2010, 12:00:00 UT |
double/multiple star system information:
| separation between brightest and second brightest component | 21,2 arcsec |
| magnitude difference between brightest and second brightest component | 11 |
| position angle | 224 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 2,9 | F5 | Al Anz, e Aurigae, 7 Aur, HR 1605, HD 31964, SAO 39955 |
| B | 9,46 | B0 |
sources:
| 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 | |
| 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 | |
| 30 | GCVS, 4th edition |
| Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88 | |
| 31 | CRM' (non-GCVS variable data) |
| 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 (J1950) | RA: 4h 58min 22,53sec | DEC: +43° 45' 5,36'' | ±0,004 arcsec |
| position (J2000) | RA: 5h 1min 58,14sec | DEC: +43° 49' 23,7'' | |
| proper motion J1950 (FK4) | RA: 0,0001 arcsec/a | DEC: -0,004 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0 arcsec/a | DEC: -0,005 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3,5 (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: 183 |
| Durchmusterung | BD+43 1166 |
| Boss General Catalogue | 6123 |
| Henry Draper Catalogue | 31964 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 5h 2min | DEC: +43° 49' |
| proper motion (J2000) | RA: -0,001 arcsec/a | DEC: -0,004 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 |
| AB | 1878 | 5 | 224° | 21,2'' | 2,99 | 14 | F0Iae | BU 554 |
| AC | 1878 | 6 | 275° | 43'' | 2,99 | 11,26 | - | BU 554 |
| AD | 1879 | 5 | 317° | 46,2'' | 2,99 | 12 | - | BU 554 |
| AE | 1913 | 2 | 48° | 207,6'' | 2,99 | 9,2 | - | BU 554 |
discoverer information:
| discoverer code | discoverer | reference |
| BU 554 | Burnham, S.W. | - |
notes:
| note | Epsilon Aur. A is a enigmatic supergiant eclipsing system. |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (J1950) | RA: 4h 58min 22,5sec | DEC: +43° 45' 5'' |
variability informations:
| variability type | EA/GS | close binary eclipsing system |
| magnitute at max. brightness | 2,92 | |
| magnitute at min. brightness | 3,83 | |
| photometric system | visual, photovisual or Johnson's V | |
| epoch for maximum light [JD] | 2435629 4. June 1956, 12:00:00 UT |
|
| period [d] | 9892 | |
| next maximum light [JD] | 2455413 4. August 2010, 12:00:00 UT |
|
| duration of the eclipse | 08 % of period |
spectral information
| spectral class | A8Ia-F2epIa+BV |
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 | 8/9005 |
| constellation | Auriga |
| notes on existence | The star is equivalent to '0089006 zet'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| EA | 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. |
| GS | Systems with one or both giant and supergiant components; one of the components may be a main sequence star. |