HD 69830 d
HD 69830 d is a Neptune-like planet orbiting HD 69830 in the constellation Puppis. It lies about 41 light-years from Earth and was discovered in 2006 using the radial velocity method. It orbits within the habitable zone of its star — the region where liquid water could exist on a planet's surface.
Is HD 69830 d in the Habitable Zone?
HD 69830 d orbits within the optimistic habitable zone of HD 69830 — the broader region where liquid water might be possible under favorable atmospheric conditions.
Habitable zone of HD 69830: 0.596–1.421 AU (conservative: 0.755–1.347 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on HD 69830 d — one full orbit around HD 69830 — lasts 197.0 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.630 AU — comparable to the inner Solar System. Its orbit is mildly elliptical (eccentricity 0.07).
How Was HD 69830 d Discovered?
HD 69830 d was discovered in 2006 using the radial velocity method, with observations from La Silla Observatory.
The radial velocity method measures the subtle wobble of a star caused by the gravitational pull of an orbiting planet, visible as periodic shifts in the star's light spectrum. The size of the wobble reveals the planet's minimum mass.
How Far Away Is HD 69830 d?
HD 69830 d is 41.0 light-years (12.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1985. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 721,600 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. HD 69830 d scores 0.53, ranking #217 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 69830
HD 69830
- Surface temperature
- 5,385 K (Sun: 5,772 K)
- Mass
- 0.86 M☉
- Luminosity
- 0.6026 L☉
- Age
- 7.0 billion years (Sun: 4.6)
The HD 69830 Planetary System
HD 69830 d is one of 3 known planets in the HD 69830 system. Its siblings:
- HD 69830 b (Neptune-like)
- HD 69830 c (Neptune-like)
HD 69830 d — Complete Data
| Mass (best estimate) | 18.10 Earth masses |
|---|---|
| Orbital period | 197.00 days |
| Orbital distance | 0.630 AU |
| Eccentricity | 0.070 |
| Earth Similarity Index | 0.53 |
| Distance from Earth | 41.0 light-years (12.6 parsecs) |
| Constellation | Puppis |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2006 |
Data: NASA Exoplanet Archive, last updated 2015-03-26. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 69830 d
Is HD 69830 d habitable?
HD 69830 d orbits within the habitable zone of HD 69830, the region where liquid water could exist on a planet's surface. Whether it is actually habitable depends on its atmosphere and composition, which remain unknown.
How far away is HD 69830 d?
HD 69830 d is about 41 light-years from Earth in the constellation Puppis. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 721,600 years to get there.
How long is a year on HD 69830 d?
One orbit around HD 69830 takes 197.0 Earth days.
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