Key parameters at a glance

A radius of 0.92 Earth radii
A mass of 0.72 Earth masses
Surface gravity around 0.85 g
An orbital period of 0.935 days
Semi-major axis 0.0194 AU
Equilibrium temperature 2,124 K (1851 °C)
Distance from Earth 2,456.80 light-years
Earth Similarity Index 0.132
Travel time at Voyager 1 speed 43,325,713 years

Kepler-1338 b Planet Profile

Physical Specs

Radius

0.92 R⊕

Radius (Jupiter)

0.082 R♃

Mass

0.72 M⊕

Mass (Jupiter)

0.002 M♃

Density

5.09 g/cm³

Surface Gravity

0.85 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.132

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

#396of 570

top 69.3%

This planet

0.92R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-779 b 0.92 R⊕ Kepler-1365 b 0.92 R⊕ TRAPPIST-1 e 0.92 R⊕

Metric	Earth	Kepler-1338 b	Jupiter
Radius (R⊕)	1.00	0.92	11.21
Mass (M⊕)	1.00	0.72	317.83
Density (g/cm³)	5.51	5.09	1.33
Surface Gravity (g)	1.00	0.85	2.53
Insolation (S⊕)	1.00	4,712.11	0.037

Star Catalogue Identifiers

TIC

TIC 120105633

Gaia DR2

Gaia DR2 2103743018162573952

Gaia DR3

Gaia DR3 2103743018162573952

System

Kepler-1338

Percentile among Rocky Terrestrial cohort

Radius 0.920 R⊕ · percentile 29 / cohort 570

Mass 0.721 M⊕ · percentile 26 / cohort 570

Orbital period 0.94 d · percentile 10 / cohort 567

Distance 753.26 pc · percentile 81 / cohort 566

ESI 0.132 · percentile 3 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

0.935 days

Semi-major axis

0.0194 AU

Eccentricity

0.000

Inclination

86.81 °

Year Length

A year here lasts roughly 22.4 hours long on a nearly circular orbit at a mean orbital distance of 0.0194 AU.

Transit Fingerprint

Depth

0.006 %

Duration

1.542 h

Impact parameter b

0.432

Rp / R★

0.007711

Transit midpoint (BJD)

2,454,965.1993

Photometric dip

Transit produces a flux drop of 65 ppm lasting ≈ 1.54 h.

Extended Orbital Architecture

Planet / star radius ratio

0.007711

Semi-major axis / stellar radius

4.362

Impact parameter (b)

0.432

Transit mid-time (BJD)

2,454,965.1993

Angular separation (arcsec)

0.02570

Eq. Temperature

2,124K

(1851 °C)

Insolation (S⊕)

4,712.11

Earth = 1.00

Earth Similarity (ESI)

0.132

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-1338

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,909 K — hotter than the Sun (5,778 K)

Estimated Age

3.80 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.050 R☉

Stellar Mass

1.040 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.410 dex

Stellar density

0.540 g/cm³

Metallicity ratio

[Fe/H]

Distance

753.26 parsec

Light-years 2,456.80 ly

V-band magnitude

13.70 mag

Voyager-speed travel 43,325,713 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.299 mas

Total Proper Motion

21.206 mas/yr

PM Right Ascension

-7.21 mas/yr

PM Declination

-19.94 mas/yr

Galactic Cartesian (pc)

x = 0.181 · y = -0.724 · z = 0.665

Equatorial (J2000)

RA 284.04227° · Dec 41.69903°

Galactic ℓ, b

71.679° · 16.835°

Ecliptic λ, β

294.365° · 63.955°

HTM-20 index

1551961078