Capella

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Capella Aa/Ab
Auriga constellation map.png
Capella is the brightest starn in Auriga
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Auriga
Richt ascension 05h 16m 41.3591s[1][note 1]
Declination +45° 59′ 52.768″[1][note 1]
Apparent magnitude (V) 0.08[2] (0.03 - 0.16[3])
Characteristics
U−B colour index +0.44[2]
B−V colour index +0.80[2]
V−R colour index −0.3[2]
R−I colour index +0.44[2]
Variable teep RS CVn[1]
Aa
Spectral teep K0III[4]
Ab
Spectral teep G1III[4]
Astrometry
Aa
Radial velocity (Rv) +29.9387 ± 0.0032[5][note 2] km/s
Proper motion (μ) RA: 75.52[1][note 1] mas/yr
Dec.: −427.11[1][note 1] mas/yr
Parallax (π) 76.20 ± 0.46[6] mas
Distance 13.159 ± 0.015[5] pc
Absolute magnitude (MV) 0.296[5]
Ab
Absolute magnitude (MV) 0.167[5]
Orbit[5]
Period (P) 104.02128 ± 0.00016 d
Semimajor axis (a) 56.442 ± 0.023"
(0.74272 ± 0.00069 AU)
Eccentricity (e) 0.00089 ± 0.00011
Inclination (i) 137.156& ± 0.046°
Longitude o the node (Ω) 40.522 ± 0.039°
Periastron epoch (T) 2448147.6 ± 2.6 JD
Argument o periastron (ω)
(primary)
342.6 ± 9.0 JD°
Semi-amplitude (K1)
(primary)
25.9611 ± 0.0044 km/s
Semi-amplitude (K2)
(secondary)
26.860 ± 0.0017 km/s
Details[5]
Aa
Mass 2.5687 ± 0.0074 M
Radius 11.98 ± 0.57 R
Luminosity (bolometric) 78.7 ± 4.2 L
Surface gravity (log g) 2.691 ± 0.041 cgs
Temperatur 4,970 ± 50 K
Metallicity −0.04 ± 0.06
Rotation 104 ± 3
Rotational velocity (v sin i) 4.1 ± 0.4 km/s
Ab
Mass 2.4828 ± 0.0067 M
Radius 8.83 ± 0.33 R
Luminosity (bolometric) 72.7 ± 3.6 L
Surface gravity (log g) 2.941 ± 0.032 cgs
Temperatur 5,730 ± 60 K
Rotation 8.5 ± 0.2
Rotational velocity (v sin i) 35.0 ± 0.5 km/s
Age 590 - 650 Myr
Ither designations
Alhajoth, Capella, Hokulei, α Aurigae, α Aur, Alpha Aurigae, Alpha Aur, 13 Aurigae, 13 Aur, ADS 3841 AP, BD+45°1077, CCDM J05168+4559AP, FK5 193, GC 6427, GJ 194, HD 34029, HIP 24608, HR 1708, IDS 05093+4554 AP, LTT 11619, NLTT 14766, PPM 47925, SAO 40186, WDS 05167+4600Aa/Ab.[1][2][7][8]
Database references
SIMBAD data

Capella is the brichtest starn in the constellation Auriga, the saxt brichtest in the nicht sky an the third brichtest in the northren celestial hemisphere, efter Arcturus an Vega.

Notes[eedit | eedit soorce]

  1. 1.0 1.1 1.2 1.3 Astrometric data, mirrored bi SIMBAD frae the Hipparcos catalogue, pertains tae the centre o mass o the Capella Aa/Ab binary seestem. See Volume 1, The Hipparcos and Tycho Catalogues, European Space Agency, 1997, §2.3.4, an the entry in the Hipparcos catalogue (CDS ID I/239.)
  2. Radial velocity figur is for the centre o mass o the Capella Aa/Ab binary seestem.

References[eedit | eedit soorce]

  1. 1.0 1.1 1.2 1.3 1.4 1.5 NAME CAPELLA – Variable of RS CVn type, database entry, SIMBAD. Accessed on line December 23, 2008.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 Hoffleit, Dorrit; Jaschek, Carlos (1991). "The Bright star catalogue". New Haven, Conn.: Yale University Observatory, 5th rev.ed. Bibcode:1991bsc..book.....H. 
  3. Petit, M. (1990). "Catalogue of Variable or Suspected Stars Nearby the Sun". Astronomy and Astrophysics Supplement. 85: 971. Bibcode:1990A&AS...85..971P. 
  4. 4.0 4.1 Strassmeier, K. G.; Fekel, F. C. (1990). "The spectral classification of chromospherically active binary stars with composite spectra". Astronomy and Astrophysics. 230: 389. Bibcode:1990A&A...230..389S. 
  5. 5.0 5.1 5.2 5.3 5.4 5.5 Torres, Guillermo; Claret, Antonio; Pavlovski, Krešimir; Dotter, Aaron (2015). "Capella (α Aurigae) Revisited: New Binary Orbit, Physical Properties, and Evolutionary State". The Astrophysical Journal. 807: 26. arXiv:1505.07461. Bibcode:2015ApJ...807...26T. doi:10.1088/0004-637X/807/1/26. 
  6. van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–64. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  7. Sirius Matters, Noah Brosch, Springer: 2008, ISBN 1-4020-8318-1, p. 46.
  8. Entry 05167+4600, The Washington Double Star Catalog, United States Naval Observatory. Accessed on line December 24, 2008.

Coordinates: Sky map 05h 16m 41.3591s, +45° 59′ 52.768″