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Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Virgo |
Right ascension | 12h 21m 34.143s [1] |
Declination | −03° 28′ 39.64″ [1] |
Apparent magnitude (V) | 15.94 [2] |
Characteristics | |
Evolutionary stage | Metal-poor star[ citation needed] |
Spectral type | CEMP[ citation needed] |
Astrometry | |
Proper motion (μ) |
RA: −2.817
[1]
mas/
yr Dec.: −8.763 [1] mas/ yr |
Parallax (π) | 0.0893 ± 0.042 mas [1] |
Distance | approx. 40,000
ly (approx. 11,000 pc) |
Details | |
Mass | 0.8 [3] M☉ |
Radius | 2.5 [1] R☉ |
Luminosity | 6.3 [1] L☉ |
Surface gravity (log g) | 2.05 [3] cgs |
Temperature | 5,100 [3] K |
Metallicity [Fe/H] | −2.96 [4] dex |
Age | 13.6 [3] Gyr |
Other designations | |
HE 1219-0312, 2MASS J12213413-0328396 | |
Database references | |
SIMBAD | data |
HE 1219-0312 is an extremely metal-poor star in the constellation Virgo, The star is located at around 41,400 light years away from earth. [1]
It is thought to be a second generation, Population II or metal-poor star ([Fe/H] = -2.96), The star was found in the sample of extremely metal-poor halo stars from the Hamburg/ESO Survey by W. Hayek and collaborators. The group's research was published in the July 2, 2009 issue of The Astrophysical Journal. [4]
If the age of the star HE 1219-0312 was confirmed at 17.6 billion years, that this star will be the oldest star in the universe. [4]
The abundance of two strongly r-process enhanced in two metal-poor stars, BPS CS29491-0069 and HE 1219-0312 was detected by HERES project, which there was ([Fe/H] = -2.51, [r/Fe] = +1.1) and ([Fe/H] = -2.96, [r/Fe] = +1.5). [4]
the analysis based on high-quality VLT/UVES spectra and MARCS model atmosphere was detected these eighteen heavy elements in the spectrum of HE 1219–0312 with an case of Th II 4019A line. [4]
Radioactive dating for HE 1219–0312 with the observed thorium and rare-earth elements abundance pairs results in an average age of 9.5 billion years, when based on solar r-process residuals, that Age of the star HE 1219-0312 was 17.6 billion years, so, we puts the age of HE 1219-0312 into 13.6 billion years to avoid to exceed the universe's age. [4]