Key parameters at a glance

A radius of 1.16 Earth radii
A mass of 1.68 Earth masses
Surface gravity around 1.24 g
An orbital period of 2.791 days
Semi-major axis 0.0334 AU
Equilibrium temperature 816 K (543 °C)
Distance from Earth 619.15 light-years
Earth Similarity Index 0.389
Travel time at Voyager 1 speed 10,918,740 years
Almost certainly tidally locked to its host star given the close orbit

Kepler-1939 b Planet Profile

Physical Specs

Radius

1.16 R⊕

Radius (Jupiter)

0.104 R♃

Mass

1.68 M⊕

Mass (Jupiter)

0.005 M♃

Density

5.84 g/cm³

Surface Gravity

1.24 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.389

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

#145of 570

top 25.3%

This planet

1.16R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

TOI-500 b 1.17 R⊕ Kepler-1955 b 1.17 R⊕ K2-400 b 1.16 R⊕

Metric	Earth	Kepler-1939 b	Jupiter
Radius (R⊕)	1.00	1.16	11.21
Mass (M⊕)	1.00	1.68	317.83
Density (g/cm³)	5.51	5.84	1.33
Surface Gravity (g)	1.00	1.24	2.53
Insolation (S⊕)	1.00	104.74	0.037

Star Catalogue Identifiers

TIC

TIC 120578688

Gaia DR2

Gaia DR2 2103800158408255872

Gaia DR3

Gaia DR3 2103800158408255872

System

Kepler-1939

Percentile among Rocky Terrestrial cohort

Radius 1.165 R⊕ · percentile 75 / cohort 570

Mass 1.680 M⊕ · percentile 68 / cohort 570

Orbital period 2.79 d · percentile 32 / cohort 567

Distance 189.83 pc · percentile 31 / cohort 566

ESI 0.389 · percentile 57 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

2.791 days

Semi-major axis

0.0334 AU

Eccentricity

0.000

Inclination

87.73 °

Year Length

A year here lasts approximately 2.79 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0334 AU.

Transit Fingerprint

Depth

0.022 %

Duration

0.662 h

Impact parameter b

0.044

Rp / R★

0.013602

Transit midpoint (BJD)

2,454,966.1534

Photometric dip

Transit produces a flux drop of 224 ppm lasting ≈ 0.66 h.

Extended Orbital Architecture

Planet / star radius ratio

0.013602

Semi-major axis / stellar radius

32.620

Impact parameter (b)

0.044

Transit mid-time (BJD)

2,454,966.1534

Angular separation (arcsec)

0.17600

Eq. Temperature

816K

(543 °C)

Insolation (S⊕)

104.74

Earth = 1.00

Earth Similarity (ESI)

0.389

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

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-1939

Spectral Class

K-type orange

Effective Temperature

4,353 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.603 R☉

Stellar Mass

0.648 M☉

Metallicity [Fe/H]

-0.18

Extended Stellar Properties

Surface gravity (log g)

4.681 dex

Stellar density

19.109 g/cm³

Metallicity ratio

[Fe/H]

Distance

189.83 parsec

Light-years 619.15 ly

V-band magnitude

13.62 mag

Voyager-speed travel 10,918,740 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

5.239 mas

Total Proper Motion

32.593 mas/yr

PM Right Ascension

-11.36 mas/yr

PM Declination

30.55 mas/yr

Galactic Cartesian (pc)

x = 0.204 · y = -0.727 · z = 0.656

Equatorial (J2000)

RA 285.68993° · Dec 40.99467°

Galactic ℓ, b

71.487° · 15.423°

Ecliptic λ, β

296.701° · 62.987°

HTM-20 index

1821548079