HD 4308

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Star
HD 4308
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
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  
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
Cordoba Survey CD −66 ° 38
Henry Draper Catalog HD 4308 [1]
Gliese catalog GJ 9028 [2]
Hipparcos catalog HIP 3497 [3]
SAO catalog SAO 248244 [4]
Tycho catalog TYC 8847-598-1 [5]Template: Infobox star / maintenance / specification of the TYC catalog
Other names LHS1139 • LTT 416

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

  1. ↑ a b c Hipparcos catalog (ESA 1997)
  2. ↑ Pulkovo radial velocities for 35493 HIP stars
  3. ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
  4. ↑ calculated from apparent brightness and distance