HD 40979

From Wikipedia, the free encyclopedia
Jump to: navigation, search


HD 40979
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 06h 04m 29.94s[1]
Declination +44° 15′ 37.6″[1]
Apparent magnitude (V) 6.734
Characteristics
Spectral type F8V
B−V color index 0.565
Astrometry
Radial velocity (Rv) 32.8 ± 0.2 km/s
Proper motion (μ) RA: 93.85 ± 0.47[1] mas/yr
Dec.: -152.79 ± 0.23[1] mas/yr
Parallax (π) 30.20 ± 0.44[1] mas
Distance 108 ± 2 ly
(33.1 ± 0.5 pc)
Absolute magnitude (MV) 4.120
Details
Mass 1.08 M
Radius 1.21 R
Luminosity L
Surface gravity (log g) 20.6 g cgs
Temperature 5929 K
Metallicity 19.4 %
Age 1.48 G years
Other designations
GSC 02937-01747, 2MASS J06042993+4415379, PPM 48712, TYC 2937-1747-1, SAO 40830, BD+44° 1353, HIP 28767
Database references
SIMBAD data
Extrasolar Planets
Encyclopaedia
data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

HD 40979 is a yellow-white dwarf star about 108 light-years away[1] in the constellation of Auriga. The star is a member of a multiple system: it has a companion HD 40979B which shares its proper motion and is located at a projected distance of 6400 AU from the primary. HD 40979B itself has a companion (designated HD 40979C) at a projected distance of 129 AU from star B, making the system a triple.

As of 2002, there is one extrasolar planet known to be orbiting around HD 40979A.[2]

Planetary system[edit]

The HD 40979A planetary system[3]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b >3.83 ± 0.36 MJ 0.855 ± 0.049 263.84 ± 0.71 0.269 ± 0.034

See also[edit]

References[edit]

  1. ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ Fischer, Debra A.; et al. (2003). "A Planetary Companion to HD 40979 and Additional Planets Orbiting HD 12661 and HD 38529". The Astrophysical Journal. 586 (2): 1394–1408. Bibcode:2003ApJ...586.1394F. doi:10.1086/367889. 
  3. ^ Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493Freely accessible. Bibcode:2006ApJ...646..505B. doi:10.1086/504701. 

External links[edit]

Coordinates: Sky map 06h 04m 29.9431s, +44° 15′ 37.599″