Key parameters at a glance
- A radius of 1.37 Earth radii
- A mass of 2.45 Earth masses
- Surface gravity around 1.31 g
- An orbital period of 4.144 days
- Semi-major axis 0.0480 AU
- Equilibrium temperature 864 K (591 °C)
- Distance from Earth 2,436.15 light-years
- Earth Similarity Index 0.359
- Travel time at Voyager 1 speed 42,961,454 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around Kepler-240
Kepler-240 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-240 b this | Super-Earth | 1.37 | 2.45 | 4.144 | 864 | 2014 |
| Kepler-240 c | Sub-Neptune | 2.20 | 102.30 | 7.954 | 696 | 2014 |
Kepler-240 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#966of 1176
top 82.1%
This planet
1.37R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-240 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.37 | 11.21 |
| Mass (M⊕) | 1.00 | 2.45 | 317.83 |
| Density (g/cm³) | 5.51 | 5.24 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.31 | 2.53 |
| Insolation (S⊕) | 1.00 | 142.74 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 122712446
Gaia DR2
Gaia DR2 2101521042605000832
Gaia DR3
Gaia DR3 2101521042605000832
System
Kepler-240
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.14 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0480 AU.
Transit Fingerprint
Depth
0.039 %
Duration
2.368 h
Impact parameter b
0.240
Rp / R★
0.018407
Transit midpoint (BJD)
2,454,968.9266
Photometric dip
Transit produces a flux drop of 392 ppm lasting ≈ 2.37 h.
Extended Orbital Architecture
Planet / star radius ratio
0.018407
Semi-major axis / stellar radius
13.767
Impact parameter (b)
0.240
Transit mid-time (BJD)
2,454,968.9266
Angular separation (arcsec)
0.06430
Eq. Temperature
864K
(591 °C)
Insolation (S⊕)
142.74
Earth = 1.00
Earth Similarity (ESI)
0.359
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-240
Spectral Class
K-type orange
Effective Temperature
4,985 K — cooler than the Sun (5,778 K)
Estimated Age
1.91 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.739 R☉
Stellar Mass
0.868 M☉
Metallicity [Fe/H]
0.41
Extended Stellar Properties
Surface gravity (log g)
4.626 dex
Stellar density
1.780 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.311 mas
Total Proper Motion
10.592 mas/yr
PM Right Ascension
-2.32 mas/yr
PM Declination
-10.34 mas/yr
Galactic Cartesian (pc)
x = 0.273 · y = -0.706 · z = 0.653
Equatorial (J2000)
RA 291.15876° · Dec 40.75021°
Galactic ℓ, b
73.013° · 11.556°
Ecliptic λ, β
305.133° · 61.633°
HTM-20 index
1626680490
Similar Worlds
Kepler-901 b
Super-Earth · K-type orange
Radius 1.37 R⊕ · 828.0 ly
K2-368 c
Super-Earth · K-type orange
Radius 1.36 R⊕ · 673.9 ly
Kepler-1315 b
Super-Earth · K-type orange
Radius 1.38 R⊕ · 1,568.4 ly
Kepler-1120 b
Super-Earth · K-type orange
Radius 1.38 R⊕ · 2,006.6 ly
K2-270 b
Super-Earth · K-type orange
Radius 1.38 R⊕ · 914.9 ly
Kepler-1246 b
Super-Earth · K-type orange
Radius 1.36 R⊕ · 1,423.7 ly