HD 4308

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
Distance71.9 ± 0.5 ly
(22.1 ± 0.2 pc)
Details
Mass0.95 ± 0.05[3] M☉
Radius1.04 ± 0.03[3] R☉
Luminosity1.03 ± 0.01[3] L☉
Surface gravity (log g)4.38 ± 0.02[3] cgs
Temperature5714 ± 61[3] K
Metallicity-0.31
Age1.6 ± 4.0[3] Gyr
Other designations
Gliese 31.5, GJ 9028, GC 897, GCRV 50662, HIP 3497, LFT 71, LHS 1139, LPM 40, LTT 416, SAO 248244, 2MASS J00443925-6538581, TYC 8847-598-1, PPM 352003
Database references
SIMBADdata
ARICNSdata
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]

The HD 4308 planetary system[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. 1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752 Freely accessible. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 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.
  3. 1 2 3 4 5 6 Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. Bibcode:2015A&A...575A..18B. arXiv:1411.4302 Freely accessible. doi:10.1051/0004-6361/201424951.
  4. 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. Bibcode:2006A&A...447..361U. arXiv:astro-ph/0510354 Freely accessible. doi:10.1051/0004-6361:20054084.

Coordinates: 00h 44m 39.2677s, −65° 38′ 58.280″


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