Key parameters at a glance

A radius of 1.93 Earth radii
A mass of 4.38 Earth masses
Surface gravity around 1.18 g
An orbital period of 4.148 days
Semi-major axis 0.0541 AU
Equilibrium temperature 1,389 K (1116 °C)
Distance from Earth 5,323.29 light-years
Earth Similarity Index 0.190
Travel time at Voyager 1 speed 93,876,213 years

Kepler-1238 b Planet Profile

Physical Specs

Radius

1.93 R⊕

Radius (Jupiter)

0.172 R♃

Mass

4.38 M⊕

Mass (Jupiter)

0.014 M♃

Density

3.35 g/cm³

Surface Gravity

1.18 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.190

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#85of 1176

top 7.1%

This planet

1.93R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-231 c 1.93 R⊕ Kepler-298 c 1.93 R⊕ TOI-912 b 1.93 R⊕

Metric	Earth	Kepler-1238 b	Jupiter
Radius (R⊕)	1.00	1.93	11.21
Mass (M⊕)	1.00	4.38	317.83
Density (g/cm³)	5.51	3.35	1.33
Surface Gravity (g)	1.00	1.18	2.53
Insolation (S⊕)	1.00	1,195.20	0.037

Star Catalogue Identifiers

TIC

TIC 169931288

Gaia DR2

Gaia DR2 2073671753111037440

Gaia DR3

Gaia DR3 2073671753111037440

System

Kepler-1238

Percentile among Super-Earth cohort

Radius 1.930 R⊕ · percentile 92 / cohort 1176

Mass 4.380 M⊕ · percentile 84 / cohort 1176

Orbital period 4.15 d · percentile 33 / cohort 1164

Distance 1,632.13 pc · percentile 96 / cohort 1171

ESI 0.190 · percentile 10 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

4.148 days

Semi-major axis

0.0541 AU

Eccentricity

0.000

Inclination

78.14 °

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 0.0541 AU.

Transit Fingerprint

Depth

0.014 %

Duration

3.674 h

Impact parameter b

0.054

Rp / R★

0.011992

Transit midpoint (BJD)

2,454,968.5353

Photometric dip

Transit produces a flux drop of 138 ppm lasting ≈ 3.67 h.

Extended Orbital Architecture

Planet / star radius ratio

0.011992

Semi-major axis / stellar radius

8.736

Impact parameter (b)

0.054

Transit mid-time (BJD)

2,454,968.5353

Angular separation (arcsec)

0.03310

Eq. Temperature

1,389K

(1116 °C)

Insolation (S⊕)

1,195.20

Earth = 1.00

Earth Similarity (ESI)

0.190

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

Discovery Paper

Primary reference

Morton et al. 2016

Instrument

Kepler CCD Array

Publication

2016-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at Kepler (12 shown).

Kepler-1512 b · Rocky Terrestrial Kepler-1410 b · Super-Earth Kepler-560 b · Super-Earth Kepler-1389 b · Super-Earth Kepler-1450 b · Super-Earth Kepler-1544 b · Super-Earth Kepler-1459 b · Super-Earth Kepler-1638 b · Super-Earth Kepler-737 b · Super-Earth Kepler-1185 b · Super-Earth Kepler-1178 b · Rocky Terrestrial Kepler-1040 b · Sub-Neptune

Host System: Kepler-1238

Spectral Class

F-type yellow-white

Effective Temperature

6,386 K — hotter than the Sun (5,778 K)

Estimated Age

2.14 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.480 R☉

Stellar Mass

1.300 M☉

Metallicity [Fe/H]

0.05

Extended Stellar Properties

Surface gravity (log g)

4.210 dex

Stellar density

0.733 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,632.13 parsec

Light-years 5,323.29 ly

V-band magnitude

14.92 mag

Voyager-speed travel 93,876,213 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.585 mas

Total Proper Motion

4.515 mas/yr

PM Right Ascension

-2.43 mas/yr

PM Declination

-3.80 mas/yr

Galactic Cartesian (pc)

x = 0.358 · y = -0.675 · z = 0.645

Equatorial (J2000)

RA 297.90577° · Dec 40.16284°

Galactic ℓ, b

74.930° · 6.749°

Ecliptic λ, β

314.567° · 59.359°

HTM-20 index

-610302151