HD 5319

HD 5319
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cetus
Right ascension 00h 55m 01.40s[1]
Declination +00° 47′ 22.4″[1]
Apparent magnitude (V) 8.05
Characteristics
Spectral type K0III
Astrometry
Proper motion (μ) RA: –4.93 ± 0.90[1] mas/yr
Dec.: –49.66 ± 0.53[1] mas/yr
Parallax (π)8.74 ± 0.86[1] mas
Distance370 ± 40 ly
(110 ± 10 pc)
Details
Mass1.40 ± 0.14[2] M☉
Radius3.97 ± 0.43[2] R☉
Luminosity9[2] L☉
Metallicity [Fe/H]+0.14[2] dex
Age3.30 ± 1.11[2] Gyr
Other designations
BD+00°142, HIP 4297, SAO 109532
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

HD 5319 is an 8th magnitude star approximately 370 light years away[1] in the constellation Cetus. It is a giant star of spectral type K0, having run out of hydrogen in its core. When it was main-sequence, the spectral type was early F or late A.

The absolute magnitude (apparent magnitude at 10 parsecs) is 3.05, which would translate to easy naked eye visibility, but its distance is ten times greater, so its apparent magnitude is 8.05 (100 times fainter than its absolute magnitude), it is not visible to the naked eye and binoculars are needed.

Planetary system

On January 11, 2007, the California and Carnegie Planet Search team found a 1.94 MJ extrasolar planet orbiting the giant star. It was published in the December 1, 2007 edition of the Astrophysical Journal.[3]

The HD 5319 planetary system[3]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b >1.94 MJ 1.75 674.6 ± 16.9 0.12 ± 0.08 — —

See also

References

  1. 1 2 3 4 5 6 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry
  2. 1 2 3 4 5 Ghezzi, L.; et al. (December 2010), "Metallicities of Planet-hosting Stars: A Sample of Giants and Subgiants", The Astrophysical Journal, 725 (1): 721–733, arXiv:1008.3539Freely accessible, Bibcode:2010ApJ...725..721G, doi:10.1088/0004-637X/725/1/721.
  3. 1 2 Robinson, Sarah E.; et al. (2007). "Two Jovian-Mass Planets in Earthlike Orbits". The Astrophysical Journal. 670 (2): 1391–1400. arXiv:0708.0832Freely accessible. Bibcode:2007ApJ...670.1391R. doi:10.1086/522106.

Coordinates: 00h 55m 01.4005s, +00° 47′ 22.392″

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