HD 20782
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Star HD 20782 |
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| AladinLite | |||||||||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Chemical furnace | ||||||||||||
| Right ascension | 03 h 20 m 3.58 s | ||||||||||||
| declination | -28 ° 51 ′ 14.7 ″ | ||||||||||||
| Apparent brightness | 7.36 likes | ||||||||||||
| Typing | |||||||||||||
| Known exoplanets | 1 | ||||||||||||
| Spectral class | G3 V | ||||||||||||
| Astrometry | |||||||||||||
| Radial velocity | (39.5 ± 0.3) km / s | ||||||||||||
| parallax | (28.15 ± 0.62) mas | ||||||||||||
| distance | (116 ± 3) ly (35.5 ± 0.8) pc |
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| Visual absolute brightness M vis | approx. +4.6 mag | ||||||||||||
| Proper movement | |||||||||||||
| Rec. Share: | (+349.33 ± 0.37) mas / a | ||||||||||||
| Dec. portion: | (−65.92 ± 0.56) mas / a | ||||||||||||
| Physical Properties | |||||||||||||
| Dimensions | 1.0 M ☉ | ||||||||||||
| radius | 1.1 R ☉ | ||||||||||||
| Effective temperature | approx. 5800 K | ||||||||||||
| Metallicity [Fe / H] | −0.05 ± 0.03 | ||||||||||||
| Age | 7 bill. A | ||||||||||||
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Other names and catalog entries |
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HD 20782 is a Sun-like star in the constellation Fornax, about 116 light-years away . It has an apparent visual magnitude of 7.4 mag. The star is orbited by an exoplanet with the systematic name HD 20782 b with an orbital period of almost 600 days.
Planetary companion
HD 20782 b is in a strongly elliptical orbit with an eccentricity of 0.96 and a semi-major axis of approx. 1.4 astronomical units . The minimum mass is less than 2 masses of Jupiter; this suggests that it is a gas planet . The object was discovered using the radial velocity method.
literature
KE Yeager, J. Eberle, M. Cuntz: "On the ejection of Earth-mass planets from the habitable zones of the solar twins HD 20782 and HD 188015"; in: International Journal of Astrobiology, Vol. 10, No. 1 (2011)
Web links
- Encyclopedia of the Extrasolar Planets
- Stephen R. Kane et al .: Evidence for Reflected Light from the Most Eccentric Exoplanet Known . In: Astrophysical Journal . March 12, 2016, arxiv : 1511.08679 .
- Exoplanet discovered with the most eccentric orbit. scinexx , March 21, 2016, accessed March 22, 2016 .
Individual evidence
- ↑ a b c Hipparcos catalog (ESA 1997)
- ↑ Pulkovo radial velocities for 35493 HIP stars
- ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
- ↑ estimated from apparent brightness and distance