Kepler-289 b
Kepler-289 b is a puffy low-density planet orbiting Kepler-289 in the constellation Cygnus. It lies about 2,298 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-289 b?
Kepler-289 b has a radius of 2.49 times that of Earth. Its mass is 3.7 times that of Earth, giving it a density of 1.45 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is Kepler-289 b in the Habitable Zone?
The position of Kepler-289 b relative to the habitable zone of Kepler-289 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-289: 0.795–1.863 AU (conservative: 1.007–1.766 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 Kepler-289 b — one full orbit around Kepler-289 — lasts 34.5 Earth days, shorter than Mercury's 88-day year.
How Was Kepler-289 b Discovered?
Kepler-289 b was discovered in 2014 using the transit method, with observations from Kepler.
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
How Far Away Is Kepler-289 b?
Kepler-289 b is 2,297.6 light-years (704.4 parsecs) from Earth. Light arriving here tonight left the planet about 2,298 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 40,437,760 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. Kepler-289 b scores 0.30, ranking #1,510 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-289
Kepler-289
- Surface temperature
- 5,990 K (Sun: 5,772 K)
- Mass
- 1.08 M☉
- Radius
- 1.00 R☉
- Luminosity
- 1.1508 L☉
- Age
- 0.7 billion years (Sun: 4.6)
The Kepler-289 Planetary System
Kepler-289 b is one of 4 known planets in the Kepler-289 system. Its siblings:
- Kepler-289 c (Cold Gas Giant)
- Kepler-289 d (Puffy Planet)
- Kepler-289 e (Neptune-like)
Kepler-289 b — Complete Data
| Radius | 2.490 Earth radii (0.222 Jupiter radii) |
|---|---|
| Mass | 3.70 Earth masses (0.012 Jupiter masses) |
| Density | 1.45 g/cm³ (Earth: 5.51) |
| Orbital period | 34.54 days |
| Earth Similarity Index | 0.30 |
| Distance from Earth | 2,297.6 light-years (704.4 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2014 |
Data: NASA Exoplanet Archive, last updated 2024-09-13. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-289 b
Is Kepler-289 b habitable?
Kepler-289 b is not known to orbit within the habitable zone of Kepler-289, and as a puffy low-density planet it is an unlikely candidate for life as we know it.
How far away is Kepler-289 b?
Kepler-289 b is about 2,298 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 40,437,760 years to get there.
How big is Kepler-289 b compared to Earth?
Kepler-289 b has 2.49 times the radius of Earth and about 3.7 times its mass.
How long is a year on Kepler-289 b?
One orbit around Kepler-289 takes 34.5 Earth days — short enough that 11 of its years would fit into one Earth year.
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