Key parameters at a glance

A radius of 1.66 Earth radii
A mass of 3.40 Earth masses
Surface gravity around 1.23 g
An orbital period of 12.147 days
Semi-major axis 0.1108 AU
Equilibrium temperature 1,097 K (824 °C)
Distance from Earth 1,471.75 light-years
Earth Similarity Index 0.261
Travel time at Voyager 1 speed 25,954,360 years

Kepler-1838 b Planet Profile

Physical Specs

Radius

1.66 R⊕

Radius (Jupiter)

0.148 R♃

Mass

3.40 M⊕

Mass (Jupiter)

0.011 M♃

Density

4.08 g/cm³

Surface Gravity

1.23 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.261

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#468of 1176

top 39.7%

This planet

1.66R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-379 b 1.66 R⊕ Kepler-1497 b 1.66 R⊕ GJ 357 c 1.66 R⊕

Metric	Earth	Kepler-1838 b	Jupiter
Radius (R⊕)	1.00	1.66	11.21
Mass (M⊕)	1.00	3.40	317.83
Density (g/cm³)	5.51	4.08	1.33
Surface Gravity (g)	1.00	1.23	2.53
Insolation (S⊕)	1.00	271.60	0.037

Star Catalogue Identifiers

TIC

TIC 171585303

Gaia DR2

Gaia DR2 2073539536845074176

Gaia DR3

Gaia DR3 2073539536845074176

System

Kepler-1838

Percentile among Super-Earth cohort

Radius 1.660 R⊕ · percentile 60 / cohort 1176

Mass 3.400 M⊕ · percentile 55 / cohort 1176

Orbital period 12.15 d · percentile 70 / cohort 1164

Distance 451.24 pc · percentile 44 / cohort 1171

ESI 0.261 · percentile 27 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

12.147 days

Semi-major axis

0.1108 AU

Eccentricity

0.000

Inclination

86.45 °

Year Length

A year here lasts approximately 12.15 Earth days (3.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1108 AU.

Transit Fingerprint

Depth

0.007 %

Duration

6.401 h

Impact parameter b

0.891

Rp / R★

0.009120

Transit midpoint (BJD)

2,454,964.5477

Photometric dip

Transit produces a flux drop of 71 ppm lasting ≈ 6.40 h.

Extended Orbital Architecture

Planet / star radius ratio

0.009120

Semi-major axis / stellar radius

7.400

Impact parameter (b)

0.891

Transit mid-time (BJD)

2,454,964.5477

Angular separation (arcsec)

0.24600

Eq. Temperature

1,097K

(824 °C)

Insolation (S⊕)

271.60

Earth = 1.00

Earth Similarity (ESI)

0.261

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Valizadegan et al. 2022

Instrument

Kepler CCD Array

Publication

2022-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Kepler (12 shown).

Kepler-1816 b · Super-Earth Kepler-1705 c · Sub-Neptune Kepler-1948 b · Rocky Terrestrial Kepler-196 d · Sub-Neptune Kepler-1853 b · Super-Earth Kepler-1840 b · Sub-Neptune Kepler-1881 b · Sub-Neptune Kepler-1858 b · Sub-Neptune Kepler-1874 b · Sub-Neptune Kepler-1802 c · Sub-Neptune Kepler-1749 b · Super-Earth Kepler-1849 b · Sub-Neptune

Host System: Kepler-1838

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,877 K — hotter than the Sun (5,778 K)

Estimated Age

4.47 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.963 R☉

Stellar Mass

1.187 M☉

Metallicity [Fe/H]

0.04

Extended Stellar Properties

Surface gravity (log g)

3.927 dex

Stellar density

0.175 g/cm³

Metallicity ratio

[Fe/H]

Distance

451.24 parsec

Light-years 1,471.75 ly

V-band magnitude

11.44 mag

Voyager-speed travel 25,954,360 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.188 mas

Total Proper Motion

36.280 mas/yr

PM Right Ascension

0.76 mas/yr

PM Declination

-36.27 mas/yr

Galactic Cartesian (pc)

x = 0.371 · y = -0.669 · z = 0.645

Equatorial (J2000)

RA 298.99172° · Dec 40.14226°

Galactic ℓ, b

75.335° · 6.023°

Ecliptic λ, β

316.057° · 59.033°

HTM-20 index

-563437151