Key parameters at a glance

A radius of 1.46 Earth radii
A mass of 2.73 Earth masses
Surface gravity around 1.28 g
An orbital period of 8.074 days
Semi-major axis 0.0594 AU
Equilibrium temperature 420 K (147 °C)
Distance from Earth 735.13 light-years
Earth Similarity Index 0.694
Travel time at Voyager 1 speed 12,964,066 years
Almost certainly tidally locked to its host star given the close orbit

Kepler-1439 b Planet Profile

Physical Specs

Radius

1.46 R⊕

Radius (Jupiter)

0.130 R♃

Mass

2.73 M⊕

Mass (Jupiter)

0.009 M♃

Density

4.82 g/cm³

Surface Gravity

1.28 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.694

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

#819of 1176

top 69.6%

This planet

1.46R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-190 c 1.46 R⊕ Kepler-808 b 1.46 R⊕ Kepler-366 b 1.46 R⊕

Metric	Earth	Kepler-1439 b	Jupiter
Radius (R⊕)	1.00	1.46	11.21
Mass (M⊕)	1.00	2.73	317.83
Density (g/cm³)	5.51	4.82	1.33
Surface Gravity (g)	1.00	1.28	2.53
Insolation (S⊕)	1.00	9.08	0.037

Star Catalogue Identifiers

TIC

TIC 120578712

Gaia DR2

Gaia DR2 2103799368134289024

Gaia DR3

Gaia DR3 2103799368134289024

System

Kepler-1439

Percentile among Super-Earth cohort

Radius 1.460 R⊕ · percentile 29 / cohort 1176

Mass 2.730 M⊕ · percentile 27 / cohort 1176

Orbital period 8.07 d · percentile 57 / cohort 1164

Distance 225.39 pc · percentile 26 / cohort 1171

ESI 0.694 · percentile 85 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

8.074 days

Semi-major axis

0.0594 AU

Eccentricity

0.000

Inclination

85.44 °

Year Length

A year here lasts approximately 8.07 Earth days (2.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0594 AU.

Transit Fingerprint

Depth

0.106 %

Duration

2.217 h

Impact parameter b

0.928

Rp / R★

0.031404

Transit midpoint (BJD)

2,455,373.0416

Photometric dip

Transit produces a flux drop of 1,056 ppm lasting ≈ 2.22 h.

Extended Orbital Architecture

Planet / star radius ratio

0.031404

Semi-major axis / stellar radius

11.670

Impact parameter (b)

0.928

Transit mid-time (BJD)

2,455,373.0416

Angular separation (arcsec)

0.26400

Eq. Temperature

420K

(147 °C)

Insolation (S⊕)

9.08

Earth = 1.00

Earth Similarity (ESI)

0.694

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

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-1439

Spectral Class

M-type red dwarf

Effective Temperature

3,578 K — cooler than the Sun (5,778 K)

Estimated Age

4.07 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.430 R☉

Stellar Mass

0.460 M☉

Metallicity [Fe/H]

-0.03

Extended Stellar Properties

Surface gravity (log g)

4.830 dex

Stellar density

6.985 g/cm³

Metallicity ratio

[Fe/H]

Distance

225.39 parsec

Light-years 735.13 ly

V-band magnitude

17.05 mag

Voyager-speed travel 12,964,066 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

4.409 mas

Total Proper Motion

42.364 mas/yr

PM Right Ascension

-19.28 mas/yr

PM Declination

-37.72 mas/yr

Galactic Cartesian (pc)

x = 0.205 · y = -0.727 · z = 0.656

Equatorial (J2000)

RA 285.73970° · Dec 40.97987°

Galactic ℓ, b

71.488° · 15.383°

Ecliptic λ, β

296.774° · 62.963°

HTM-20 index

1701266251