HD 4308
Star HD 4308 |
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AladinLite | |||||||||||||||
Observation dates equinox : J2000.0 , epoch : J2000.0 |
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Constellation | Toucan | ||||||||||||||
Right ascension | 00 h 44 m 39.27 s | ||||||||||||||
declination | -65 ° 38 ′ 58.3 ″ | ||||||||||||||
Apparent brightness | 6.55 mag | ||||||||||||||
Typing | |||||||||||||||
Known exoplanets | 1 | ||||||||||||||
Spectral class | G3 V | ||||||||||||||
Astrometry | |||||||||||||||
Radial velocity | (+95.2 ± 0.3) km / s | ||||||||||||||
parallax | (45.34 ± 0.32) mas | ||||||||||||||
distance | (71.9 ± 0.5) ly (22.1 ± 0.2) pc |
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Visual absolute brightness M vis | approx. +4.8 mag | ||||||||||||||
Proper movement | |||||||||||||||
Rec. Share: | (+157.49 ± 0.27) mas / a | ||||||||||||||
Dec. portion: | (−742.32 ± 0.31) mas / a | ||||||||||||||
Physical Properties | |||||||||||||||
Other names and catalog entries |
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HD 4308 is a star of apparent magnitude 6.55 in the constellation Toucan . The star has about 83% of the mass of the Sun and has the metallicity [Fe / H] = −0.31. In 2005 it was also discovered through measurements of the radial velocity that an exoplanet orbits the star , which was given the systematic name HD 4308 b .
Exoplanet
HD 4308 b orbits the central star once in about 15.6 days on a practically circular orbit (eccentricity = 0.00 ± 0.01) at a distance of approx. 0.12 astronomical units , i.e. at a distance significantly smaller than that of the Earth to sun. The mass of the planet can be narrowed down, it must have less than 4.7% of the mass of Jupiter, which would still correspond to 15 times the mass of the earth.
literature
- Udry et al .: The HARPS search for southern extra-solar planets V. A 14 Earth-masses planet orbiting HD 4308 In:
Astronomy and Astrophysics , vol. 447 (2006), pp. 361-367.
Udry et al .: The HARPS search for southern extra-solar planets V. A 14 Earth-masses planet orbiting HD 4308 . In: Astronomy and Astrophysics . 447, 2006, pp. 361-367.
Web links
- HD 4308 b from the Extrasolar Planets Encyclopaedia
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)
- ↑ calculated from apparent brightness and distance