Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Lynx |
Right ascension | 08h 15m 54.26778s [1] |
Declination | +47° 29′ 47.6013″ [1] |
Characteristics | |
Evolutionary stage | main-sequence star |
Spectral type | F5V [2] |
Astrometry | |
Radial velocity (Rv) | -108 [2] km/s |
Proper motion (μ) |
RA: -14.257
mas/
yr
[1] Dec.: -24.214 mas/ yr [1] |
Parallax (π) | 0.4089 ± 0.0685 mas [1] |
Distance | approx. 8,000
ly (approx. 2,400 pc) |
Details [3] | |
Surface gravity (log g) | 4.7 ± 0.6 cgs |
Temperature | 6142 ± 118 K |
Metallicity [Fe/H] | −5.49±0.14 [4] dex |
Other designations | |
SDSS J081554.26+472947.5, Gaia DR2 931227322991970560 | |
Database references | |
SIMBAD | data |
SDSS J081554.26+472947.5, often abbreviated to its partial coordinates, J0815+4729, is a star with an ultra-low metallicity in the constellation of Lynx. It also has a relatively high concentration of carbon. [3] The surface of the star has temperature 6,215 K. It is at a distance of 7,500 light years (2.3 kiloparsecs) from the Sun, and is 33,000 light-years (10 kiloparsecs) from the Galactic Center. [3] Its [Fe/H] was first believed to be below –5.8 dex, making it the lowest metallicity un-evolved star detected., [3] but was revised to -5.49 dex in 2020. [4]
J0815+4729's ratio of carbon to iron, [C/Fe] is at least 5.0 dex. [3] The star is also heavily enriched in nitrogen and oxygen, originating from primordial gas cloud contaminated by single zero-metallicity supernova. The lack of heavy elements, including iron, is explained by these mostly falling back to collapsing supernova remnant. [4]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Lynx |
Right ascension | 08h 15m 54.26778s [1] |
Declination | +47° 29′ 47.6013″ [1] |
Characteristics | |
Evolutionary stage | main-sequence star |
Spectral type | F5V [2] |
Astrometry | |
Radial velocity (Rv) | -108 [2] km/s |
Proper motion (μ) |
RA: -14.257
mas/
yr
[1] Dec.: -24.214 mas/ yr [1] |
Parallax (π) | 0.4089 ± 0.0685 mas [1] |
Distance | approx. 8,000
ly (approx. 2,400 pc) |
Details [3] | |
Surface gravity (log g) | 4.7 ± 0.6 cgs |
Temperature | 6142 ± 118 K |
Metallicity [Fe/H] | −5.49±0.14 [4] dex |
Other designations | |
SDSS J081554.26+472947.5, Gaia DR2 931227322991970560 | |
Database references | |
SIMBAD | data |
SDSS J081554.26+472947.5, often abbreviated to its partial coordinates, J0815+4729, is a star with an ultra-low metallicity in the constellation of Lynx. It also has a relatively high concentration of carbon. [3] The surface of the star has temperature 6,215 K. It is at a distance of 7,500 light years (2.3 kiloparsecs) from the Sun, and is 33,000 light-years (10 kiloparsecs) from the Galactic Center. [3] Its [Fe/H] was first believed to be below –5.8 dex, making it the lowest metallicity un-evolved star detected., [3] but was revised to -5.49 dex in 2020. [4]
J0815+4729's ratio of carbon to iron, [C/Fe] is at least 5.0 dex. [3] The star is also heavily enriched in nitrogen and oxygen, originating from primordial gas cloud contaminated by single zero-metallicity supernova. The lack of heavy elements, including iron, is explained by these mostly falling back to collapsing supernova remnant. [4]