Key parameters at a glance
- A radius of 2.18 Earth radii
- A mass of 5.39 Earth masses
- Surface gravity around 1.13 g
- An orbital period of 17.648 days
- Semi-major axis 0.1270 AU
- Equilibrium temperature 579 K (306 °C)
- Distance from Earth 2,480.69 light-years
- Earth Similarity Index 0.457
- Travel time at Voyager 1 speed 43,747,029 years
- Almost certainly tidally locked to its host star given the close orbit
2 siblings around Kepler-250
Kepler-250 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-250 b | Rocky Terrestrial | 1.13 | 1.51 | 4.148 | 938 | 2014 |
| Kepler-250 c | Sub-Neptune | 2.28 | 5.82 | 7.157 | 782 | 2014 |
| Kepler-250 d this | Sub-Neptune | 2.18 | 5.39 | 17.648 | 579 | 2014 |
Kepler-250 d Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1703of 1978
top 86.0%
This planet
2.18R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-250 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.18 | 11.21 |
| Mass (M⊕) | 1.00 | 5.39 | 317.83 |
| Density (g/cm³) | 5.51 | 2.86 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.13 | 2.53 |
| Insolation (S⊕) | 1.00 | 21.46 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 159098652
Gaia DR2
Gaia DR2 2126903680847794048
Gaia DR3
Gaia DR3 2126903680847794048
System
Kepler-250
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 17.65 Earth days (4.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1270 AU.
Transit Fingerprint
Depth
0.076 %
Duration
1.980 h
Impact parameter b
0.020
Rp / R★
0.025641
Transit midpoint (BJD)
2,454,966.5450
Photometric dip
Transit produces a flux drop of 763 ppm lasting ≈ 1.98 h.
Extended Orbital Architecture
Planet / star radius ratio
0.025641
Semi-major axis / stellar radius
68.200
Impact parameter (b)
0.020
Transit mid-time (BJD)
2,454,966.5450
Angular separation (arcsec)
0.16700
Eq. Temperature
579K
(306 °C)
Insolation (S⊕)
21.46
Earth = 1.00
Earth Similarity (ESI)
0.457
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-250
Spectral Class
K-type orange
Effective Temperature
5,160 K — cooler than the Sun (5,778 K)
Estimated Age
13.20 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.805 R☉
Stellar Mass
0.806 M☉
Metallicity [Fe/H]
0.01
Extended Stellar Properties
Surface gravity (log g)
4.565 dex
Stellar density
1.850 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
1.286 mas
Total Proper Motion
28.484 mas/yr
PM Right Ascension
0.57 mas/yr
PM Declination
-28.48 mas/yr
Galactic Cartesian (pc)
x = 0.241 · y = -0.676 · z = 0.696
Equatorial (J2000)
RA 289.59476° · Dec 44.14181°
Galactic ℓ, b
75.657° · 14.044°
Ecliptic λ, β
305.032° · 65.215°
HTM-20 index
147960869
Similar Worlds
Kepler-113 c
Sub-Neptune · K-type orange
Radius 2.18 R⊕ · 855.7 ly
Kepler-261 b
Sub-Neptune · K-type orange
Radius 2.18 R⊕ · 1,035.5 ly
TOI-238 c
Sub-Neptune · K-type orange
Radius 2.18 R⊕ · 262.7 ly
Kepler-662 b
Sub-Neptune · K-type orange
Radius 2.18 R⊕ · 2,660.2 ly
Kepler-245 c
Sub-Neptune · K-type orange
Radius 2.18 R⊕ · 2,809.9 ly
K2-379 b
Sub-Neptune · K-type orange
Radius 2.18 R⊕ · 594.3 ly