HD 190984 b
HD 190984 b is a cold gas giant orbiting the F8 V star HD 190984 in the constellation Pavo. It lies about 483 light-years from Earth and was discovered in 2009 using the radial velocity method.
Is HD 190984 b in the Habitable Zone?
HD 190984 b orbits beyond the outer edge of the habitable zone of HD 190984. At that distance, any surface water would almost certainly be frozen.
Habitable zone of HD 190984: 1.216–2.849 AU (conservative: 1.540–2.701 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Orbit and Year Length
A year on HD 190984 b — one full orbit around HD 190984 — lasts 4,885.0 Earth days, longer than Jupiter's 12-year orbit. It orbits at an average distance of 5.500 AU. Its orbit is highly elliptical (eccentricity 0.57), swinging dramatically closer to and farther from its star.
How Was HD 190984 b Discovered?
HD 190984 b was discovered in 2009 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 190984 b?
HD 190984 b is 483.3 light-years (148.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1543. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 8,506,080 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 190984 b scores 0.17, ranking #4,097 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 190984
HD 190984
- Spectral type
- F8 V
- Surface temperature
- 5,988 K (Sun: 5,772 K)
- Mass
- 0.91 M☉
- Radius
- 1.53 R☉
- Luminosity
- 2.6915 L☉
Planetary System
HD 190984 b is the only planet known to orbit HD 190984 so far.
HD 190984 b — Complete Data
| Mass (best estimate) | 985.20 Earth masses |
|---|---|
| Orbital period | 4,885.00 days |
| Orbital distance | 5.500 AU |
| Eccentricity | 0.570 |
| Earth Similarity Index | 0.17 |
| Distance from Earth | 483.3 light-years (148.2 parsecs) |
| Constellation | Pavo |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2009 |
Data: NASA Exoplanet Archive, last updated 2014-08-21. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 190984 b
Is HD 190984 b habitable?
No — HD 190984 b orbits outside the habitable zone of HD 190984 and is likely too cold for liquid water on its surface.
How far away is HD 190984 b?
HD 190984 b is about 483 light-years from Earth in the constellation Pavo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 8,506,080 years to get there.
How long is a year on HD 190984 b?
One orbit around HD 190984 takes 4,885.0 Earth days.
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