Key parameters at a glance
- A radius of 2.09 Earth radii
- A mass of 5.02 Earth masses
- Surface gravity around 1.15 g
- An orbital period of 5.931 days
- Semi-major axis 0.0560 AU
- Equilibrium temperature 614 K (341 °C)
- Distance from Earth 957.26 light-years
- Earth Similarity Index 0.439
- Travel time at Voyager 1 speed 16,881,360 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around Kepler-155
Kepler-155 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-155 b this | Sub-Neptune | 2.09 | 5.02 | 5.931 | 614 | 2014 |
| Kepler-155 c | Sub-Neptune | 2.24 | 5.65 | 52.662 | 286 | 2014 |
Kepler-155 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1832of 1978
top 92.6%
This planet
2.09R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-155 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.09 | 11.21 |
| Mass (M⊕) | 1.00 | 5.02 | 317.83 |
| Density (g/cm³) | 5.51 | 3.02 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.15 | 2.53 |
| Insolation (S⊕) | 1.00 | 23.50 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 298969755
Gaia DR2
Gaia DR2 2133351698066484096
Gaia DR3
Gaia DR3 2133351698066484096
System
Kepler-155
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.93 Earth days (1.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0560 AU.
Transit Fingerprint
Depth
0.104 %
Duration
2.371 h
Impact parameter b
0.670
Rp / R★
0.030650
Transit midpoint (BJD)
2,455,007.7966
Photometric dip
Transit produces a flux drop of 1,035 ppm lasting ≈ 2.37 h.
Extended Orbital Architecture
Planet / star radius ratio
0.030650
Semi-major axis / stellar radius
20.690
Impact parameter (b)
0.670
Transit mid-time (BJD)
2,455,007.7966
Angular separation (arcsec)
0.19100
Eq. Temperature
614K
(341 °C)
Insolation (S⊕)
23.50
Earth = 1.00
Earth Similarity (ESI)
0.439
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.
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-155
Spectral Class
M-type red dwarf
Effective Temperature
4,508 K — cooler than the Sun (5,778 K)
Estimated Age
2.90 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.620 R☉
Stellar Mass
0.635 M☉
Metallicity [Fe/H]
-0.14
Extended Stellar Properties
Surface gravity (log g)
4.684 dex
Stellar density
1.008 g/cm³
Rotation period
26.43 days
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
3.379 mas
Total Proper Motion
8.848 mas/yr
PM Right Ascension
-5.35 mas/yr
PM Declination
-7.05 mas/yr
Galactic Cartesian (pc)
x = 0.199 · y = -0.596 · z = 0.778
Equatorial (J2000)
RA 288.49578° · Dec 51.08193°
Galactic ℓ, b
81.987° · 17.449°
Ecliptic λ, β
310.043° · 71.957°
HTM-20 index
213539482
Similar Worlds
Kepler-296 d
Sub-Neptune · M-type red dwarf
Radius 2.09 R⊕ · 544.7 ly
Kepler-52 b
Sub-Neptune · M-type red dwarf
Radius 2.10 R⊕ · 1,048.7 ly
K2-286 b
Sub-Neptune · M-type red dwarf
Radius 2.10 R⊕ · 248.4 ly
Kepler-54 b
Sub-Neptune · M-type red dwarf
Radius 2.10 R⊕ · 886.2 ly
TOI-406.01
Sub-Neptune · M-type red dwarf
Radius 2.08 R⊕ · 101.3 ly
TOI-1801 b
Sub-Neptune · M-type red dwarf
Radius 2.08 R⊕ · 100.1 ly