Kepler 444
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Star Kepler-444 |
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| AladinLite | |||||||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | lyre | ||||||||||
| Right ascension | 19 h 19 m 0.55 s | ||||||||||
| declination | + 41 ° 38 ′ 4.6 ″ | ||||||||||
| Apparent brightness | 8.86 likes | ||||||||||
| Typing | |||||||||||
| Known exoplanets | 5 | ||||||||||
| B − V color index | (+0.81) | ||||||||||
| U − B color index | (+0.34) | ||||||||||
| R − I index | (+0.52) | ||||||||||
| Spectral class | K0 V | ||||||||||
| Astrometry | |||||||||||
| Radial velocity | −121.19 ± 0.11 km / s | ||||||||||
| parallax | 27.41 ± 0.03 mas | ||||||||||
| distance | 119 ly 36.5 pc |
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| Proper movement | |||||||||||
| Rec. Share: | 94.68 ± 0.06 mas / a | ||||||||||
| Dec. portion: | −632.20 ± 0.05 mas / a | ||||||||||
| Physical Properties | |||||||||||
| Dimensions | 0.758 ± 0.043 M ☉ | ||||||||||
| radius | 0.752 ± 0.014 R ☉ | ||||||||||
| Effective temperature | 5046 ± 74 K | ||||||||||
| Metallicity [Fe / H] | −0.55 ± 0.07 | ||||||||||
| Age | (11.23 +0.91−0.99) Bill. A | ||||||||||
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Other names and catalog entries |
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Kepler-444 (HIP 94931) is an orange main sequence star of the spectral class K0V in the constellation Lyra, almost 120 light years away from Earth . It is a little cooler than the sun and has a very lower metallicity of Fe / H = −0.55. It has a planetary system of at least five planets and is extraordinarily old at around 11.2 billion years. The planets are believed to be rocky planets all of which orbit their star in very tight orbits (less than 10 days). Currently (discovery in January 2015) the star has the oldest known system of earth-sized planets.
Web links
- Zeit Online - Kepler-444: Ancient, hypothermic and surprising (January 27, 2015)
Individual evidence
- ↑ a b c d e BD + 41 3306. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on September 3, 2018 .
- ↑ a b c Kepler-444. In: NASA Exoplanet Archive . Retrieved September 3, 2018 .
- ↑ a b c d e T. L. Campante et al. "An ancient extrasolar system with five sub-Earth-size planets", arxiv : 1501.06227
- ↑ a b BD + 41 3306A. In: SIMBAD. Center de Données astronomiques de Strasbourg, accessed on September 3, 2018 .