HD 4308
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Tucana |
| Right ascension | 00h 44m 39.267s[1] |
| Declination | –65° 38′ 58.28″[1] |
| Apparent magnitude (V) | 6.54[2] |
| Characteristics | |
| Spectral type | G6V[2] |
| Apparent magnitude (B) | ~7.19[2] |
| Apparent magnitude (V) | ~6.54[2] |
| Apparent magnitude (J) | 5.366 ±0.024[2] |
| Apparent magnitude (H) | 5.101 ±0.016[2] |
| Apparent magnitude (K) | 4.945 ±0.020[2] |
| Astrometry | |
| Radial velocity (Rv) | 97.7 ± 5 km/s |
| Proper motion (μ) | RA: 157.49 ± 0.27[1] mas/yr Dec.: -742.32 ± 0.31[1] mas/yr |
| Parallax (π) | 45.34 ± 0.32[1] mas |
| Distance | 71.9 ± 0.5 ly (22.1 ± 0.2 pc) |
| Details | |
| Mass | 0.95 ± 0.05[3] M☉ |
| Radius | 1.04 ± 0.03[3] R☉ |
| Luminosity | 1.03 ± 0.01[3] L☉ |
| Surface gravity (log g) | 4.38 ± 0.02[3] cgs |
| Temperature | 5714 ± 61[3] K |
| Metallicity | -0.31 |
| Age | 1.6 ± 4.0[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
| Extrasolar Planets Encyclopaedia | data |
HD 4308 is a 6th magnitude star located approximately 72 light years away in the southern constellation of Tucana.[2]
Planetary system
In 2005, a low-mass planet was found in orbit around this star using the radial velocity method with the HARPS spectrograph. Unusual for a star with planets, HD 4308 has a metallicity lower than that of the Sun.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >0.0442 MJ | 0.115 | 15.56 ± 0.02 | 0.00 ± 0.01 | — | — |
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 8 "SIMBAD query result: LHS 1139 -- High proper-motion Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2009-05-23.
- 1 2 3 4 5 6 Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951.
- 1 2 Udry, S.; et al. (2006). "The HARPS search for southern extra-solar planets V. A 14 Earth-masses planet orbiting HD 4308". Astronomy and Astrophysics. 447 (1): 361–367. arXiv:astro-ph/0510354. Bibcode:2006A&A...447..361U. doi:10.1051/0004-6361:20054084.
External links
- "HD 4308". Exoplanets. Retrieved 2009-05-23.
Coordinates: 
00h 44m 39.2677s, −65° 38′ 58.280″
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