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 |
| Distance | 370 ± 40 ly (110 ± 10 pc) |
| Details | |
| Mass | 1.40 ± 0.14[2] M☉ |
| Radius | 3.97 ± 0.43[2] R☉ |
| Luminosity | 9[2] L☉ |
| Metallicity [Fe/H] | +0.14[2] dex |
| Age | 3.30 ± 1.11[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| 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]
| 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 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
- 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:1008.3539, Bibcode:2010ApJ...725..721G, doi:10.1088/0004-637X/725/1/721.
- 1 2 Robinson, Sarah E.; et al. (2007). "Two Jovian-Mass Planets in Earthlike Orbits". The Astrophysical Journal 670 (2): 1391–1400. arXiv:0708.0832. Bibcode:2007ApJ...670.1391R. doi:10.1086/522106.
External links
- "HD 5319". The Extrasolar Planets Encyclopaedia.
Coordinates: 
00h 55m 01.4005s, +00° 47′ 22.392″
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