Lambda2 Fornacis
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Fornax |
| Right ascension | 02h 36m 58.61s[1] |
| Declination | –34° 34′ 40.7″[1] |
| Apparent magnitude (V) | 5.78 |
| Characteristics | |
| Spectral type | G1V |
| B−V color index | 0.67 |
| Astrometry | |
| Radial velocity (Rv) | 10.3 ± 2 km/s |
| Proper motion (μ) | RA: –18.35 ± 0.22[1] mas/yr Dec.: –259.35 ± 0.27[1] mas/yr |
| Parallax (π) | 38.79 ± 0.40[1] mas |
| Distance | 84.1 ± 0.9 ly (25.8 ± 0.3 pc) |
| Absolute magnitude (MV) | 3.74 ± 0.04[2] |
| Details | |
| Mass | 1.18 ± 0.04[2] M☉ |
| Radius | 1.50 ± 0.05[2] R☉ |
| Surface gravity (log g) | 4.12 ± 0.03[2] cgs |
| Temperature | 5,936[2] K |
| Metallicity [Fe/H] | +0.19[2] dex |
| Age | 4.34 ± 0.82[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
| Extrasolar Planets Encyclopaedia | data |
Lambda2 Fornacis (also called HD 16417) is a 6th magnitude G-type main sequence star located approximately 84 light years away in the constellation of Fornax. It is more massive, hotter, and more metal-rich than our Sun and only 300 million years younger.
Planetary system
Precision Doppler spectroscopy from an intensive 48 night observing campaign on the Anglo-Australian Telescope has revealed the presence of a low-mass extrasolar planet orbiting the star.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥0.069 ± 0.007 MJ | 0.14 ± 0.01 | 17.24 ± 0.01 | 0.2 ± 0.09 | — | — |
See also
References
- 1 2 3 4 5 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
- 1 2 3 4 5 6 7 da Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics 458 (2): 609–623, arXiv:astro-ph/0608160, Bibcode:2006A&A...458..609D, doi:10.1051/0004-6361:20065105
- 1 2 O’Toole, Simon; et al. (2009). "A Neptune-mass Planet Orbiting the Nearby G Dwarf HD16417". The Astrophysical Journal 697 (2): 1263–1268. arXiv:0902.4024. Bibcode:2009ApJ...697.1263O. doi:10.1088/0004-637X/697/2/1263.
Coordinates: 
02h 36m 58.6079s, −34° 34′ 40.717″
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