eps Ind A b
eps Ind A b is a cold gas giant orbiting the K5 V star eps Ind A in the constellation Indus. It lies about 12 light-years from Earth and was discovered in 2019 using the radial velocity method.
Is eps Ind A b in the Habitable Zone?
eps Ind A b orbits beyond the outer edge of the habitable zone of eps Ind A. At that distance, any surface water would almost certainly be frozen.
Habitable zone of eps Ind A: 0.374–0.917 AU (conservative: 0.474–0.869 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 eps Ind A b — one full orbit around eps Ind A — lasts 25,450.0 Earth days, longer than Jupiter's 12-year orbit. It orbits at an average distance of 15.760 AU. Its orbit is mildly elliptical (eccentricity 0.25).
How Was eps Ind A b Discovered?
eps Ind A b was discovered in 2019 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 eps Ind A b?
eps Ind A b is 11.9 light-years (3.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 2015. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 209,440 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. eps Ind A b scores 0.07, ranking #4,934 of 5,566 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: eps Ind A
eps Ind A b belongs to a system of 3 stars; it orbits eps Ind A.
eps Ind A
- Spectral type
- K5 V
- Surface temperature
- 4,700 K (Sun: 5,772 K)
- Mass
- 0.80 M☉
- Radius
- 0.71 R☉
- Age
- 3.5 billion years (Sun: 4.6)
Planetary System
eps Ind A b is the only planet known to orbit eps Ind A so far.
eps Ind A b — Complete Data
| Mass | 2,065.88 Earth masses (6.500 Jupiter masses) |
|---|---|
| Orbital period | 25,450.00 days |
| Orbital distance | 15.760 AU |
| Eccentricity | 0.250 |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 11.9 light-years (3.6 parsecs) |
| Constellation | Indus |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2019 |
Data: NASA Exoplanet Archive, last updated 2026-07-09. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About eps Ind A b
Is eps Ind A b habitable?
No — eps Ind A b orbits outside the habitable zone of eps Ind A and is likely too cold for liquid water on its surface.
How far away is eps Ind A b?
eps Ind A b is about 12 light-years from Earth in the constellation Indus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 209,440 years to get there.
How long is a year on eps Ind A b?
One orbit around eps Ind A takes 25,450.0 Earth days.
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