HD 69830 d
|Extrasolar planet||List of extrasolar planets|
|Right ascension||(α)||08h 18m 23.947s|
|Declination||(δ)||−12° 37′ 55.81″|
|Distance||40.7 ± 0.2 ly
(12.49 ± 0.05 pc)
|Mass||(m)||0.86 ± 0.03 M☉|
|Temperature||(T)||5385 ± 20 K|
|Metallicity||[Fe/H]||−0.05 ± 0.02|
|Semimajor axis||(a)||0.63 AU|
|Eccentricity||(e)||0.07 ± 0.07|
|Orbital period||(P)||197 ± 3 d|
|(ω)||224 ± 61°|
|Time of periastron||(T0)||24513358 ± 34 JD|
|Semi-amplitude||(K)||2.20 ± 0.19 m/s|
|Minimum mass||(m sin i)||0.058 MJ|
|Discovery date||May 18, 2006|
|Discoverer(s)||Lovis et al.|
|Discovery method||Radial velocity|
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.
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.
Popular culture references
- In the Bestiarum included with the special editions of Halo 3, HD 69830 is described as the home star of the Jackals, specifically stating that they come from a hypothetical moon of the third planet at the inner edge of the asteroid belt.
- It is mentioned as a potentially habitable planet on the History Channel´s program The Universe.
- 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
- 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.
- "The Universe ("Another Earth")". H2. January 13, 2009.
- SST: Signs of Alien Asteroid Belt
- SolStation: HD 69830 / HR 3259
- SPACE.com: Planets Found in Potentially Habitable Setup (May 17, 2006)
- SpaceDaily: Trio Of Neptunes And Their Belt (May 18, 2006)