Key parameters at a glance
- A radius of 2.38 Earth radii
- A mass of 6.26 Earth masses
- Surface gravity around 1.11 g
- An orbital period of 10.140 days
- Semi-major axis 0.0820 AU
- Equilibrium temperature 447 K (174 °C)
- Distance from Earth 1,218.99 light-years
- Earth Similarity Index 0.557
- Travel time at Voyager 1 speed 21,496,861 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around Kepler-159
Kepler-159 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-159 b this | Sub-Neptune | 2.38 | 6.26 | 10.140 | 447 | 2014 |
| Kepler-159 c | Sub-Neptune | 3.41 | 11.50 | 43.596 | 275 | 2014 |
Kepler-159 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1365of 1978
top 69.0%
This planet
2.38R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-159 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.38 | 11.21 |
| Mass (M⊕) | 1.00 | 6.26 | 317.83 |
| Density (g/cm³) | 5.51 | 2.55 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.11 | 2.53 |
| Insolation (S⊕) | 1.00 | 33.46 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 169082553
Gaia DR2
Gaia DR2 2076764576237957504
Gaia DR3
Gaia DR3 2076764576237957504
System
Kepler-159
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 10.14 Earth days (2.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0820 AU.
Transit Fingerprint
Depth
0.123 %
Duration
2.692 h
Impact parameter b
0.680
Rp / R★
0.030853
Transit midpoint (BJD)
2,455,011.4495
Photometric dip
Transit produces a flux drop of 1,225 ppm lasting ≈ 2.69 h.
Extended Orbital Architecture
Planet / star radius ratio
0.030853
Semi-major axis / stellar radius
30.115
Impact parameter (b)
0.680
Transit mid-time (BJD)
2,455,011.4495
Angular separation (arcsec)
0.21900
Eq. Temperature
447K
(174 °C)
Insolation (S⊕)
33.46
Earth = 1.00
Earth Similarity (ESI)
0.557
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Discovery Paper
Primary reference
Rowe et al. 2014Instrument
Kepler CCD Array
Publication
2014-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2014 at Kepler (12 shown).
Host System: Kepler-159
Spectral Class
M-type red dwarf
Effective Temperature
4,625 K — cooler than the Sun (5,778 K)
Estimated Age
2.51 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.663 R☉
Stellar Mass
0.628 M☉
Metallicity [Fe/H]
-0.04
Extended Stellar Properties
Surface gravity (log g)
4.653 dex
Stellar density
2.390 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.647 mas
Total Proper Motion
15.313 mas/yr
PM Right Ascension
7.57 mas/yr
PM Declination
-13.31 mas/yr
Galactic Cartesian (pc)
x = 0.344 · y = -0.673 · z = 0.654
Equatorial (J2000)
RA 297.07020° · Dec 40.86873°
Galactic ℓ, b
75.230° · 7.651°
Ecliptic λ, β
313.903° · 60.248°
HTM-20 index
-994817845
Similar Worlds
GJ 1289 b
Sub-Neptune · M-type red dwarf
Radius 2.38 R⊕ · 27.2 ly
TOI-654.01
Sub-Neptune · M-type red dwarf
Radius 2.38 R⊕ · 188.4 ly
LTT 3780 c
Sub-Neptune · M-type red dwarf
Radius 2.39 R⊕ · 71.7 ly
Kepler-81 c
Sub-Neptune · M-type red dwarf
Radius 2.37 R⊕ · 1,136.0 ly
Kepler-125 b
Sub-Neptune · M-type red dwarf
Radius 2.37 R⊕ · 598.1 ly
K2-18 b
Sub-Neptune · M-type red dwarf
Radius 2.37 R⊕ · 124.0 ly