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 | 6 L☉ |
| Surface gravity (log g) | 20.6 g cgs |
| Temperature | 5929 K |
| Metallicity | 19.4 % |
| Age | 1.48 G years |
| Other designations | |
| 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
| 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
References
- 1 2 3 4 5 6 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry
- ↑ 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.
- ↑ Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701.
- Mugrauer, M.; Neuhäuser, R.; Mazeh, T. (2007). "The multiplicity of exoplanet host stars. Spectroscopic confirmation of the companions GJ 3021 B and HD 27442 B, one new planet host triple-star system, and global statistics". Astronomy and Astrophysics 469 (2): 755–770. arXiv:astro-ph/0703795. Bibcode:2007A&A...469..755M. doi:10.1051/0004-6361:20065883.
- "Sky Map HD 40979". http://planetquest1.jpl.nasa.gov/. Retrieved 2008-08-20.
External links
Coordinates: 
06h 04m 29.9431s, +44° 15′ 37.599″
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