Key parameters at a glance

A radius of 1.13 Earth radii
A mass of 1.51 Earth masses
Surface gravity around 1.18 g
An orbital period of 4.148 days
Semi-major axis 0.0480 AU
Equilibrium temperature 938 K (665 °C)
Distance from Earth 2,480.69 light-years
Earth Similarity Index 0.339
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 b 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 this	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	Sub-Neptune	2.18	5.39	17.648	579	2014

Kepler-250 b Planet Profile

Physical Specs

Radius

1.13 R⊕

Radius (Jupiter)

0.101 R♃

Mass

1.51 M⊕

Mass (Jupiter)

0.005 M♃

Density

5.75 g/cm³

Surface Gravity

1.18 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.339

HZ Position Inner

Controversial No

Discovery

Year 2014

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#180of 570

top 31.4%

This planet

1.13R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-887 c 1.13 R⊕ TOI-1450 A c 1.13 R⊕ G 268-110 b 1.13 R⊕

Metric	Earth	Kepler-250 b	Jupiter
Radius (R⊕)	1.00	1.13	11.21
Mass (M⊕)	1.00	1.51	317.83
Density (g/cm³)	5.51	5.75	1.33
Surface Gravity (g)	1.00	1.18	2.53
Insolation (S⊕)	1.00	148.10	0.037

Star Catalogue Identifiers

TIC

TIC 159098652

Gaia DR2

Gaia DR2 2126903680847794048

Gaia DR3

Gaia DR3 2126903680847794048

System

Kepler-250

Percentile among Rocky Terrestrial cohort

Radius 1.130 R⊕ · percentile 66 / cohort 570

Mass 1.510 M⊕ · percentile 62 / cohort 570

Orbital period 4.15 d · percentile 46 / cohort 567

Distance 760.59 pc · percentile 82 / cohort 566

ESI 0.339 · percentile 48 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

4.148 days

Semi-major axis

0.0480 AU

Eccentricity

0.000

Inclination

89.58 °

Year Length

A year here lasts approximately 4.15 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

0.018 %

Duration

2.403 h

Impact parameter b

0.750

Rp / R★

0.011755

Transit midpoint (BJD)

2,454,966.3910

Photometric dip

Transit produces a flux drop of 175 ppm lasting ≈ 2.40 h.

Extended Orbital Architecture

Planet / star radius ratio

0.011755

Semi-major axis / stellar radius

12.610

Impact parameter (b)

0.750

Transit mid-time (BJD)

2,454,966.3910

Angular separation (arcsec)

0.06310

Eq. Temperature

938K

(665 °C)

Insolation (S⊕)

148.10

Earth = 1.00

Earth Similarity (ESI)

0.339

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. 2014

Instrument

Kepler CCD Array

Publication

2014-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2014 at Kepler (12 shown).

Kepler-186 e · Super-Earth Kepler-395 c · Super-Earth Kepler-220 e · Super-Earth Kepler-249 d · Super-Earth Kepler-296 f · Super-Earth Kepler-367 c · Rocky Terrestrial Kepler-296 e · Super-Earth Kepler-155 c · Sub-Neptune Kepler-138 d · Super-Earth Kepler-333 c · Rocky Terrestrial Kepler-331 d · Super-Earth Kepler-267 d · Sub-Neptune

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]

Distance

760.59 parsec

Light-years 2,480.69 ly

V-band magnitude

15.82 mag

Voyager-speed travel 43,747,029 yr

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