Capella
| catalogues and names | Capella, a Aur, NSV 01897, 13 Aur, HR 1708, HD 34029, SAO 40186, FK5: 193, WDS 05167+4600A |
| other names | Alhajoth |
| constellation | Auriga |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | CAPELLA; Alhajoth. |
position, motion, parallax:
| position (J2000) | RA: 5h 16min 41,4sec | DEC: +45° 59' 53'' |
| position (J1900) | RA: 5h 9min 18sec | DEC: +45° 53' 47'' |
| proper motion (J2000) | RA: 0,076 arcsec/a | DEC: -0,425 arcsec/a |
| radial velocity | 30 km/s note: spectroscopic binaries, double lined spectra note: orbital data avaible |
|
| trigonometric parallax | 0,073 arcsec | |
| note (category: dynamical parallaxes): | 0.058". |
magnitude
| visual magnitude | 0,08 (V on UBV Johnson system) |
spectral / color information
| spectral class | G5IIIe+G0III |
| B-V-magnitude | 0,8 |
| U-B-magnitude | 0,44 |
| R-I-magnitude | 0,44 |
| note (category: spectra): | Chromospheric He 10830 double. Balloon-borne spectrometer revealed pronounced emission of MgII. Soft X-ray emission. Lithium content of the F-type component is 15 times that of the G component. Also classified G6III+F9III. |
variability information
| variable star identification | 1897 |
| note (category: variability): | Amp. 0.03V. Variable helium and X-ray emission. |
double/multiple star system information
| number of components of multiple star system | 10 |
| separation | 0 arcsec |
| mag difference (of double or brightest multiple) | 0,5 |
| component ID | AP |
| note (category: double and multiple data): | AP 0.6 G5III, 1.1 G0III, sep. 0.04", 0.285y, a = 0.054", masses 2.67 and 2.55 solar. Combined mag., colors. Capella is first star for which an orbit was determined from interferometer measures, by Anderson at Mt. Wilson in 1920. Speckle sep. 0.040" 1981.24 and 1981.68; 0.055" 1982.16. CPM with component H, a close binary, 10.0 dM1, 13.7 dM5 sep. 2" at 723" from A, probably physical with A. Other components all faint and distant from A. |
| note (category: spectroscopic binaries): | 104.0204d, K 26.1k/s, V0 +29.5k/s, asini 37.3. |
miscellaneous information
| note (category: group membership): | Hyades group. |
| note (category: stellar radii or diameters): | Diam. component A = 0.0052", component B = 0.0040". |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 5h 16min 41,353sec | DEC: +45° 59' 52,9'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,0073 arcsec/a | DEC: -0,425 arcsec/a | source: 25 | |
| radial velocity | 30 km/s | source: 25 | ||
| trigonometric parallax | 0,073 | ±0,007 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 162,59° | latitude: 4,57° | ||
| GCI unit vector (J2000) | X: 0,1305 | Y: 0,682315 | Z: 0,719316 | |
magnitude:
| visual | 0,08 (observed) | source: 25 |
| photovisual | 0,2 | source: 2 |
spectral information:
| spectral class | G0 | source: 96 | |
| Morgan-Keenan | G8III+G1III | source: 25 | |
| B-magnitude | 0,88 ±0,05 | B-V-magnitude | 0,8 |
| U-magnitude | 1,32 ±0,05 | U-B-magnitude | 0,44 |
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 | |
| 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 12min 59,466sec | DEC: +45° 56' 58,04'' | ±0,003 arcsec |
| position (J2000) | RA: 5h 16min 41,358sec | DEC: +45° 59' 52,98'' | |
| proper motion J1950 (FK4) | RA: 0,0077 arcsec/a | DEC: -0,423 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0074 arcsec/a | DEC: -0,424 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 0,2 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | G0 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 193 |
| Durchmusterung | BD+45 1077 |
| Boss General Catalogue | 6427 |
| Henry Draper Catalogue | 34029 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 5h 16,7min | DEC: +46° 0' |
| proper motion (J2000) | RA: 0,076 arcsec/a | DEC: -0,425 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 |
| Aa | 1919 | 50 | ° | '' | 0,08 | - | G3III | ANJ 1 |
| AB | 1898 | 1 | 23° | 46,6'' | 2,1 | 17,1 | - | BAR 25 |
| AC | 1878 | 1 | 318° | 78,2'' | 2,1 | 15,1 | - | BU 1392 |
| AD | 1878 | 1 | 183° | 126,2'' | 2,1 | 13,6 | - | BU 1392 |
| AE | 1878 | 1 | 316° | 143,2'' | 2,1 | 12,1 | - | BU 1392 |
| AF | 1851 | 10 | 147° | 169,5'' | 2,1 | 11,1 | - | HJ 2256 |
| 1922 | 143° | 141,5'' | ||||||
| AG | 1821 | 2 | 348° | 454,2'' | 2,1 | 10,1 | - | SHJ 51 |
| 1895 | - | 484,6'' | ||||||
| AH | 1895 | 1 | 141° | 723,3'' | 2,1 | 11,7 | - | FRH 1 |
discoverer information:
| discoverer code | discoverer | reference |
| ANJ 1 | Anderson, J.A. | (Astrophys. J. 51, 263; 1920.) |
| BAR 25 | Barnard, E.E. | - |
| BU 1392 | Burnham, S.W. | - |
| HJ 2256 | Herschel, J. | - |
| SHJ 51 | South & Herschel | - |
| FRH 1 | - | - |
notes:
| note | Aa: Capella. Composite spectrum; G5IIIe+G0III. P = 0.285yr., a = 0.055", motion retrograde. AF: H VI 30. AH: HL is physical with AB. The HL component at 05 17.7 +45 51 is physical. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (J1950) | RA: 5h 12min 59,5sec | DEC: +45° 56' 58'' |
variability informations:
| magnitute at max. brightness | 0,03 |
| magnitute at min. brightness | 0,16 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | * |
references
| to a study | 0832D (designation: CAPELLA) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |