Key parameters at a glance

A radius of 0.94 Earth radii
A mass of 0.78 Earth masses
Surface gravity around 0.88 g
An orbital period of 2.319 days
Semi-major axis 0.0346 AU
Equilibrium temperature 1,490 K (1217 °C)
Distance from Earth 3,764.26 light-years
Earth Similarity Index 0.203
Travel time at Voyager 1 speed 66,382,796 years

Kepler-1438 b Planet Profile

Physical Specs

Radius

0.94 R⊕

Radius (Jupiter)

0.084 R♃

Mass

0.78 M⊕

Mass (Jupiter)

0.002 M♃

Density

5.15 g/cm³

Surface Gravity

0.88 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.203

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

#384of 570

top 67.2%

This planet

0.94R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

TOI-6000 b 0.94 R⊕ Kepler-1572 b 0.94 R⊕ Kepler-1169 b 0.94 R⊕

Metric	Earth	Kepler-1438 b	Jupiter
Radius (R⊕)	1.00	0.94	11.21
Mass (M⊕)	1.00	0.78	317.83
Density (g/cm³)	5.51	5.15	1.33
Surface Gravity (g)	1.00	0.88	2.53
Insolation (S⊕)	1.00	561.12	0.037

Star Catalogue Identifiers

TIC

TIC 121946404

Gaia DR2

Gaia DR2 2101422911191267968

Gaia DR3

Gaia DR3 2101422911191267968

System

Kepler-1438

Percentile among Rocky Terrestrial cohort

Radius 0.940 R⊕ · percentile 32 / cohort 570

Mass 0.779 M⊕ · percentile 28 / cohort 570

Orbital period 2.32 d · percentile 26 / cohort 567

Distance 1,154.13 pc · percentile 96 / cohort 566

ESI 0.203 · percentile 15 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

2.319 days

Semi-major axis

0.0346 AU

Eccentricity

0.000

Inclination

87.59 °

Year Length

A year here lasts approximately 2.32 Earth days (0.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0346 AU.

Transit Fingerprint

Depth

0.010 %

Duration

1.612 h

Impact parameter b

0.410

Rp / R★

0.009273

Transit midpoint (BJD)

2,454,964.9358

Photometric dip

Transit produces a flux drop of 96 ppm lasting ≈ 1.61 h.

Extended Orbital Architecture

Planet / star radius ratio

0.009273

Semi-major axis / stellar radius

10.160

Impact parameter (b)

0.410

Transit mid-time (BJD)

2,454,964.9358

Angular separation (arcsec)

0.03000

Eq. Temperature

1,490K

(1217 °C)

Insolation (S⊕)

561.12

Earth = 1.00

Earth Similarity (ESI)

0.203

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-1438

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,530 K — cooler than the Sun (5,778 K)

Estimated Age

5.37 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.960 R☉

Stellar Mass

0.970 M☉

Metallicity [Fe/H]

0.20

Extended Stellar Properties

Surface gravity (log g)

4.460 dex

Stellar density

3.724 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,154.13 parsec

Light-years 3,764.26 ly

V-band magnitude

14.98 mag

Voyager-speed travel 66,382,796 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.839 mas

Total Proper Motion

7.808 mas/yr

PM Right Ascension

-0.32 mas/yr

PM Declination

-7.80 mas/yr

Galactic Cartesian (pc)

x = 0.251 · y = -0.716 · z = 0.652

Equatorial (J2000)

RA 289.28982° · Dec 40.68163°

Galactic ℓ, b

72.326° · 12.806°

Ecliptic λ, β

302.222° · 61.980°

HTM-20 index

-1453180474