HD 69830 d

HD 69830 d
Exoplanet List of exoplanets
Parent star
Star HD 69830
Constellation Puppis
Right ascension (α) 08h 18m 23.947s[1]
Declination (δ) −12° 37′ 55.81″[1]
Apparent magnitude (mV) 5.95
Distance40.7 ± 0.2[1] ly
(12.49 ± 0.05[1] pc)
Spectral type K0V
Mass (m) 0.86 ± 0.03 M☉
Radius (r) 0.89 R☉
Temperature (T) 5385 ± 20 K
Metallicity [Fe/H] −0.05 ± 0.02
Age 5.1–6.1 Gyr
Orbital elements
Semi-major axis(a) 0.63 AU
Eccentricity (e) 0.07 ± 0.07
Orbital period(P) 197 ± 3 d
Argument of
periastron		 (ω) 224 ± 61°
Time of periastron (T0) 24513358 ± 34 JD
Semi-amplitude (K) 2.20 ± 0.19 m/s
Physical characteristics
Minimum mass(m sin i)0.058 MJ
Temperature (T) ~284
Discovery information
Discovery date May 18, 2006
Discoverer(s) Lovis et al.[2]
Discovery method Radial velocity
Discovery status Published[2]
Database references
Extrasolar Planets
Encyclopaedia		data
SIMBADdata
Exoplanet Archivedata
Open Exoplanet Cataloguedata

HD 69830 d is an exoplanet orbiting the K-type main-sequence star HD 69830 every 197 days. It is the outermost known planet in its planetary system and possibly lies within its habitable zone.

Discovery

HD 69830 d was discovered in 2006 with the HARPS echelle spectrograph installed on the European Southern Observatory 3.6-meter telescope at La Silla Observatory, Chile.[2]

Orbit and mass

The planet's orbit has a low orbital eccentricity, like most of the planets in the Solar System. The semimajor axis of the orbit is only 0.63 AU, similar to that of Venus. However, its star is less massive and energetic than the Sun, thereby putting the planet within its habitable zone. It is 17 times the mass of the Earth, and 42 light-years from the Solar System.[3]

Characteristics

HD 69830 has around the mass of Neptune, and hence it is likely that HD 69830 d is gaseous with no solid surface. Because it has only been detected indirectly through its gravitational effects on its star, properties such as its radius and composition are unknown.

See also

References

  1. 1 2 3 4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry
  2. 1 2 3 Lovis, Christophe; et al. (2006). "An extrasolar planetary system with three Neptune-mass planets" (PDF). Nature 441 (7091): 305–309. arXiv:astro-ph/0703024. Bibcode:2006Natur.441..305L. doi:10.1038/nature04828. PMID 16710412.
  3. ↑ "The Universe ("Another Earth")". H2. January 13, 2009.

External links

Coordinates: 08h 18m 23.9s, −12° 37′ 55.0″

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