Key parameters at a glance

A radius of 1.75 Earth radii
A mass of 3.71 Earth masses
Surface gravity around 1.21 g
An orbital period of 14.878 days
Semi-major axis 0.1153 AU
Equilibrium temperature 692 K (419 °C)
Distance from Earth 6,828.47 light-years
Earth Similarity Index 0.416
Travel time at Voyager 1 speed 120,420,013 years

Kepler-939 b Planet Profile

Physical Specs

Radius

1.75 R⊕

Radius (Jupiter)

0.156 R♃

Mass

3.71 M⊕

Mass (Jupiter)

0.012 M♃

Density

3.80 g/cm³

Surface Gravity

1.21 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.416

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

#326of 1176

top 27.6%

This planet

1.75R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-301 d 1.75 R⊕ Kepler-1243 b 1.75 R⊕ Kepler-122 f 1.75 R⊕

Metric	Earth	Kepler-939 b	Jupiter
Radius (R⊕)	1.00	1.75	11.21
Mass (M⊕)	1.00	3.71	317.83
Density (g/cm³)	5.51	3.80	1.33
Surface Gravity (g)	1.00	1.21	2.53
Insolation (S⊕)	1.00	54.19	0.037

Star Catalogue Identifiers

TIC

TIC 270790652

Gaia DR2

Gaia DR2 2128223747637518208

Gaia DR3

Gaia DR3 2128223747637518208

System

Kepler-939

Percentile among Super-Earth cohort

Radius 1.750 R⊕ · percentile 71 / cohort 1176

Mass 3.710 M⊕ · percentile 64 / cohort 1176

Orbital period 14.88 d · percentile 78 / cohort 1164

Distance 2,093.62 pc · percentile 98 / cohort 1171

ESI 0.416 · percentile 63 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

14.878 days

Semi-major axis

0.1153 AU

Eccentricity

0.000

Inclination

85.91 °

Year Length

A year here lasts approximately 14.88 Earth days (4.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1153 AU.

Transit Fingerprint

Depth

0.032 %

Duration

7.504 h

Impact parameter b

0.701

Rp / R★

0.018798

Transit midpoint (BJD)

2,454,975.9686

Photometric dip

Transit produces a flux drop of 323 ppm lasting ≈ 7.50 h.

Extended Orbital Architecture

Planet / star radius ratio

0.018798

Semi-major axis / stellar radius

12.900

Impact parameter (b)

0.701

Transit mid-time (BJD)

2,454,975.9686

Angular separation (arcsec)

0.05510

Eq. Temperature

692K

(419 °C)

Insolation (S⊕)

54.19

Earth = 1.00

Earth Similarity (ESI)

0.416

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

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-939

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,471 K — cooler than the Sun (5,778 K)

Estimated Age

4.47 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.850 R☉

Stellar Mass

0.880 M☉

Metallicity [Fe/H]

-0.12

Extended Stellar Properties

Surface gravity (log g)

4.540 dex

Stellar density

0.102 g/cm³

Metallicity ratio

[Fe/H]

Distance

2,093.62 parsec

Light-years 6,828.47 ly

V-band magnitude

15.65 mag

Voyager-speed travel 120,420,013 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.449 mas

Total Proper Motion

3.668 mas/yr

PM Right Ascension

2.17 mas/yr

PM Declination

-2.96 mas/yr

Galactic Cartesian (pc)

x = 0.276 · y = -0.623 · z = 0.732

Equatorial (J2000)

RA 293.86562° · Dec 47.02681°

Galactic ℓ, b

79.651° · 12.580°

Ecliptic λ, β

314.472° · 66.818°

HTM-20 index

-1286090406