Key parameters at a glance

A radius of 0.79 Earth radii
A mass of 0.42 Earth masses
Surface gravity around 0.67 g
An orbital period of 13.060 days
Semi-major axis 0.1010 AU
Equilibrium temperature 630 K (357 °C)
Distance from Earth 1,419.68 light-years
Earth Similarity Index 0.486
Travel time at Voyager 1 speed 25,036,092 years
Almost certainly tidally locked to its host star given the close orbit

Context from the literature

Kepler-390 c is a terrestrial exoplanet that orbits a K-type star Kepler-390. Its mass is 0.418 Earths, it takes 13.1 days to complete one orbit of its star, and is 0.101 AU from its star. Its discovery was announced in 2014.

Excerpted from Wikipedia · full article

1 sibling around Kepler-390

Kepler-390 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-390 b	Rocky Terrestrial	0.82	0.48	6.738	786	2014
Kepler-390 c this	Rocky Terrestrial	0.79	0.42	13.060	630	2014

Kepler-390 c Planet Profile

Physical Specs

Radius

0.79 R⊕

Radius (Jupiter)

0.070 R♃

Mass

0.42 M⊕

Mass (Jupiter)

0.001 M♃

Density

4.66 g/cm³

Surface Gravity

0.67 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.486

HZ Position Inner

Controversial No

Discovery

Year 2014

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#488of 570

top 85.4%

This planet

0.79R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1235 b 0.79 R⊕ Kepler-1566 b 0.79 R⊕ Kepler-1222 b 0.79 R⊕

Metric	Earth	Kepler-390 c	Jupiter
Radius (R⊕)	1.00	0.79	11.21
Mass (M⊕)	1.00	0.42	317.83
Density (g/cm³)	5.51	4.66	1.33
Surface Gravity (g)	1.00	0.67	2.53
Insolation (S⊕)	1.00	41.35	0.037

Star Catalogue Identifiers

TIC

TIC 137340986

Gaia DR2

Gaia DR2 2101638759069485568

Gaia DR3

Gaia DR3 2101638759069485568

System

Kepler-390

Percentile among Rocky Terrestrial cohort

Radius 0.790 R⊕ · percentile 14 / cohort 570

Mass 0.418 M⊕ · percentile 12 / cohort 570

Orbital period 13.06 d · percentile 85 / cohort 567

Distance 435.28 pc · percentile 57 / cohort 566

ESI 0.486 · percentile 69 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

13.060 days

Semi-major axis

0.1010 AU

Eccentricity

0.000

Inclination

89.08 °

Year Length

A year here lasts approximately 13.06 Earth days (3.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1010 AU.

Transit Fingerprint

Depth

0.011 %

Duration

2.665 h

Impact parameter b

0.480

Rp / R★

0.009582

Transit midpoint (BJD)

2,454,977.3312

Photometric dip

Transit produces a flux drop of 107 ppm lasting ≈ 2.67 h.

Extended Orbital Architecture

Planet / star radius ratio

0.009582

Semi-major axis / stellar radius

30.810

Impact parameter (b)

0.480

Transit mid-time (BJD)

2,454,977.3312

Angular separation (arcsec)

0.23200

Eq. Temperature

630K

(357 °C)

Insolation (S⊕)

41.35

Earth = 1.00

Earth Similarity (ESI)

0.486

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

Rowe et al. 2014

Instrument

Kepler CCD Array

Publication

2014-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2014 at Kepler (12 shown).

Kepler-186 e · Super-Earth Kepler-395 c · Super-Earth Kepler-220 e · Super-Earth Kepler-249 d · Super-Earth Kepler-296 f · Super-Earth Kepler-367 c · Rocky Terrestrial Kepler-296 e · Super-Earth Kepler-155 c · Sub-Neptune Kepler-138 d · Super-Earth Kepler-333 c · Rocky Terrestrial Kepler-331 d · Super-Earth Kepler-267 d · Sub-Neptune

Host System: Kepler-390

Spectral Class

K-type orange

Effective Temperature

5,166 K — cooler than the Sun (5,778 K)

Estimated Age

3.24 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.776 R☉

Stellar Mass

0.787 M☉

Metallicity [Fe/H]

-0.04

Extended Stellar Properties

Surface gravity (log g)

4.569 dex

Stellar density

1.500 g/cm³

Metallicity ratio

[M/H]

Distance

435.28 parsec

Light-years 1,419.68 ly

V-band magnitude

14.23 mag

Voyager-speed travel 25,036,092 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.269 mas

Total Proper Motion

52.293 mas/yr

PM Right Ascension

6.66 mas/yr

PM Declination

51.87 mas/yr

Galactic Cartesian (pc)

x = 0.277 · y = -0.699 · z = 0.659

Equatorial (J2000)

RA 291.62881° · Dec 41.20884°

Galactic ℓ, b

73.592° · 11.439°

Ecliptic λ, β

306.146° · 61.961°

HTM-20 index

-503663215

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