HD 69830 d
From Wikipedia, the free encyclopedia
| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
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| Parent star | ||
| Star | HD 69830 | |
| Constellation | Puppis | |
| Right ascension | (α) | 08h 18m 23.9473s |
| Declination | (δ) | −12° 37′ 55.824″ |
| Apparent magnitude | (mV) | 5.95 |
| Distance | 41 ly (12.6 pc) |
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| 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 | ||
| Semimajor 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 K |
| Discovery information | ||
| Discovery date | May 18, 2006 | |
| Discoverer(s) | Lovis et al. | |
| Detection method | HARPS | |
| Discovery status | confirmed | |
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
HD 69830 d is an extrasolar planet orbiting the orange dwarf star HD 69830 every 197 days. It is the outermost known planet in its planetary system and possibly lies within its habitable zone.
Contents |
[edit] Discovery
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This section requires expansion. |
Planet HD 69830 d was discovered in 2006.
[edit] Orbit and mass
The planet's orbit has a low eccentricity, like most of the planets in our solar system. The semimajor axis of the orbit is only 0.63 AU, similar to that of Venus. However, HD 69830 is a less massive and energetic star than the Sun, thereby putting the planet within its habitable zone.
[edit] Characteristics
Given the planet's Neptune-type mass, it is likely that HD 69830 d is a gas giant with no solid surface. Since the planet has only been detected indirectly through its gravitational effects on the star, properties such as its radius and composition are unknown.
[edit] References In Popular Culture
In the Bestiarum included with the special editions of Halo 3, HD 69830 d 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.
[edit] See also
[edit] References
- Lovis et al (2006). "An extrasolar planetary system with three Neptune-mass planets". Nature 441 (7091): 305–309. arXiv:astro-ph/0703024. Bibcode 2006Natur.441..305L. doi:10.1038/nature04828. PMID 16710412. http://www.nature.com/nature/journal/v441/n7091/abs/nature04828.html.
[edit] External links
- 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)
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Coordinates: 
08h 18m 23.9s, −12° 37′ 55.0″
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