Capella


The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. The Washington Visual Double Star Catalog, 1996.0

  5. Combined General Catalogue of Variable Stars (suspected variables)


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.

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

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)).