Key parameters at a glance
- A radius of 2.77 Earth radii
- A mass of 8.10 Earth masses
- Surface gravity around 1.06 g
- An orbital period of 24.086 days
- Semi-major axis 0.1478 AU
- Equilibrium temperature 500 K (227 °C)
- Distance from Earth 2,141.15 light-years
- Earth Similarity Index 0.477
- Travel time at Voyager 1 speed 37,759,159 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-1140 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#780of 1978
top 39.4%
This planet
2.77R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1140 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.77 | 11.21 |
| Mass (M⊕) | 1.00 | 8.10 | 317.83 |
| Density (g/cm³) | 5.51 | 2.09 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.06 | 2.53 |
| Insolation (S⊕) | 1.00 | 13.05 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 123359347
Gaia DR2
Gaia DR2 2119201533172444160
Gaia DR3
Gaia DR3 2119201533172444160
System
Kepler-1140
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 24.09 Earth days (6.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1478 AU.
Transit Fingerprint
Depth
0.104 %
Duration
2.229 h
Impact parameter b
0.797
Rp / R★
0.034959
Transit midpoint (BJD)
2,454,981.2023
Photometric dip
Transit produces a flux drop of 1,042 ppm lasting ≈ 2.23 h.
Extended Orbital Architecture
Planet / star radius ratio
0.034959
Semi-major axis / stellar radius
54.600
Impact parameter (b)
0.797
Transit mid-time (BJD)
2,454,981.2023
Angular separation (arcsec)
0.22500
Eq. Temperature
500K
(227 °C)
Insolation (S⊕)
13.05
Earth = 1.00
Earth Similarity (ESI)
0.477
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
Morton et al. 2016Instrument
Kepler CCD Array
Publication
2016-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at Kepler (12 shown).
Host System: Kepler-1140
Spectral Class
K-type orange
Effective Temperature
4,850 K — cooler than the Sun (5,778 K)
Estimated Age
5.01 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.730 R☉
Stellar Mass
0.760 M☉
Metallicity [Fe/H]
-0.08
Extended Stellar Properties
Surface gravity (log g)
4.610 dex
Stellar density
5.299 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.495 mas
Total Proper Motion
14.342 mas/yr
PM Right Ascension
8.23 mas/yr
PM Declination
11.74 mas/yr
Galactic Cartesian (pc)
x = 0.138 · y = -0.669 · z = 0.731
Equatorial (J2000)
RA 281.69405° · Dec 46.94652°
Galactic ℓ, b
76.268° · 20.216°
Ecliptic λ, β
293.206° · 69.445°
HTM-20 index
1730447754
Similar Worlds
TOI-444 b
Sub-Neptune · K-type orange
Radius 2.77 R⊕ · 187.2 ly
TOI-969 b
Sub-Neptune · K-type orange
Radius 2.77 R⊕ · 252.0 ly
Kepler-1840 b
Sub-Neptune · K-type orange
Radius 2.78 R⊕ · 1,673.5 ly
TOI-1260 c
Sub-Neptune · K-type orange
Radius 2.76 R⊕ · 240.0 ly
Kepler-531 b
Sub-Neptune · K-type orange
Radius 2.78 R⊕ · 824.4 ly
K2-123 b
Sub-Neptune · K-type orange
Radius 2.76 R⊕ · 526.9 ly