Key parameters at a glance

A radius of 1.68 Earth radii
A mass of 3.46 Earth masses
Surface gravity around 1.23 g
An orbital period of 54.409 days
Semi-major axis 0.3005 AU
Equilibrium temperature 513 K (240 °C)
Distance from Earth 3,386.64 light-years
Earth Similarity Index 0.559
Travel time at Voyager 1 speed 59,723,408 years

Kepler-1391 b Planet Profile

Physical Specs

Radius

1.68 R⊕

Radius (Jupiter)

0.150 R♃

Mass

3.46 M⊕

Mass (Jupiter)

0.011 M♃

Density

4.01 g/cm³

Surface Gravity

1.23 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.559

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

#435of 1176

top 36.9%

This planet

1.68R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-795 b 1.68 R⊕ Kepler-1449 b 1.68 R⊕ Kepler-188 b 1.68 R⊕

Metric	Earth	Kepler-1391 b	Jupiter
Radius (R⊕)	1.00	1.68	11.21
Mass (M⊕)	1.00	3.46	317.83
Density (g/cm³)	5.51	4.01	1.33
Surface Gravity (g)	1.00	1.23	2.53
Insolation (S⊕)	1.00	33.34	0.037

Star Catalogue Identifiers

TIC

TIC 271253957

Gaia DR2

Gaia DR2 2128514431022374144

Gaia DR3

Gaia DR3 2128514431022374144

System

Kepler-1391

Percentile among Super-Earth cohort

Radius 1.680 R⊕ · percentile 62 / cohort 1176

Mass 3.460 M⊕ · percentile 56 / cohort 1176

Orbital period 54.41 d · percentile 96 / cohort 1164

Distance 1,038.35 pc · percentile 82 / cohort 1171

ESI 0.559 · percentile 78 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

54.409 days

Semi-major axis

0.3005 AU

Eccentricity

0.000

Inclination

89.80 °

Year Length

A year here lasts approximately 54.41 Earth days (14.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3004 AU.

Transit Fingerprint

Depth

0.019 %

Duration

9.511 h

Impact parameter b

0.157

Rp / R★

0.013934

Transit midpoint (BJD)

2,455,008.4021

Photometric dip

Transit produces a flux drop of 193 ppm lasting ≈ 9.51 h.

Extended Orbital Architecture

Planet / star radius ratio

0.013934

Semi-major axis / stellar radius

44.650

Impact parameter (b)

0.157

Transit mid-time (BJD)

2,455,008.4021

Angular separation (arcsec)

0.28900

Eq. Temperature

513K

(240 °C)

Insolation (S⊕)

33.34

Earth = 1.00

Earth Similarity (ESI)

0.559

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-1391

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,840 K — hotter than the Sun (5,778 K)

Estimated Age

5.50 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.100 R☉

Stellar Mass

1.030 M☉

Metallicity [Fe/H]

0.04

Extended Stellar Properties

Surface gravity (log g)

4.360 dex

Stellar density

0.330 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,038.35 parsec

Light-years 3,386.64 ly

V-band magnitude

13.91 mag

Voyager-speed travel 59,723,408 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.934 mas

Total Proper Motion

7.278 mas/yr

PM Right Ascension

-7.07 mas/yr

PM Declination

-1.71 mas/yr

Galactic Cartesian (pc)

x = 0.288 · y = -0.623 · z = 0.727

Equatorial (J2000)

RA 294.83097° · Dec 46.65958°

Galactic ℓ, b

79.621° · 11.825°

Ecliptic λ, β

315.603° · 66.212°

HTM-20 index

-1084647743