| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| 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) |
|
| 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.
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Planet HD 69830 d was discovered in 2006.
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.
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.
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.
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Coordinates: 08h 18m 23.9s, −12° 37′ 55.0″
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