Key parameters at a glance

A radius of 0.65 Earth radii
A mass of 0.21 Earth masses
Surface gravity around 0.49 g
An orbital period of 0.916 days
Semi-major axis 0.0156 AU
Equilibrium temperature 1,212 K (939 °C)
Distance from Earth 661.39 light-years
Earth Similarity Index 0.231
Travel time at Voyager 1 speed 11,663,535 years
Almost certainly tidally locked to its host star given the close orbit

Kepler-1351 b Planet Profile

Physical Specs

Radius

0.65 R⊕

Radius (Jupiter)

0.058 R♃

Mass

0.21 M⊕

Mass (Jupiter)

0.001 M♃

Density

4.16 g/cm³

Surface Gravity

0.49 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.231

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

#539of 570

top 94.4%

This planet

0.65R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1542 c 0.65 R⊕ Kepler-1130 d 0.64 R⊕ Kepler-1371 c 0.64 R⊕

Metric	Earth	Kepler-1351 b	Jupiter
Radius (R⊕)	1.00	0.65	11.21
Mass (M⊕)	1.00	0.21	317.83
Density (g/cm³)	5.51	4.16	1.33
Surface Gravity (g)	1.00	0.49	2.53
Insolation (S⊕)	1.00	421.97	0.037

Star Catalogue Identifiers

TIC

TIC 270609625

Gaia DR2

Gaia DR2 2077728538692850816

Gaia DR3

Gaia DR3 2077728538692850816

System

Kepler-1351

Percentile among Rocky Terrestrial cohort

Radius 0.650 R⊕ · percentile 5 / cohort 570

Mass 0.208 M⊕ · percentile 4 / cohort 570

Orbital period 0.92 d · percentile 10 / cohort 567

Distance 202.78 pc · percentile 32 / cohort 566

ESI 0.231 · percentile 21 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

0.916 days

Semi-major axis

0.0156 AU

Eccentricity

0.000

Inclination

87.78 °

Year Length

A year here lasts roughly 22 hours long on a nearly circular orbit at a mean orbital distance of 0.0156 AU.

Transit Fingerprint

Depth

0.010 %

Duration

1.150 h

Impact parameter b

0.055

Rp / R★

0.008969

Transit midpoint (BJD)

2,454,965.0228

Photometric dip

Transit produces a flux drop of 99 ppm lasting ≈ 1.15 h.

Extended Orbital Architecture

Planet / star radius ratio

0.008969

Semi-major axis / stellar radius

6.160

Impact parameter (b)

0.055

Transit mid-time (BJD)

2,454,965.0228

Angular separation (arcsec)

0.07690

Eq. Temperature

1,212K

(939 °C)

Insolation (S⊕)

421.97

Earth = 1.00

Earth Similarity (ESI)

0.231

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. 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-1351

Spectral Class

K-type orange

Effective Temperature

4,439 K — cooler than the Sun (5,778 K)

Estimated Age

4.17 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.670 R☉

Stellar Mass

0.700 M☉

Metallicity [Fe/H]

-0.03

Extended Stellar Properties

Surface gravity (log g)

4.640 dex

Stellar density

4.819 g/cm³

Metallicity ratio

[Fe/H]

Distance

202.78 parsec

Light-years 661.39 ly

V-band magnitude

14.33 mag

Voyager-speed travel 11,663,535 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

4.903 mas

Total Proper Motion

61.028 mas/yr

PM Right Ascension

-48.28 mas/yr

PM Declination

37.33 mas/yr

Galactic Cartesian (pc)

x = 0.297 · y = -0.679 · z = 0.672

Equatorial (J2000)

RA 293.60843° · Dec 42.19787°

Galactic ℓ, b

75.168° · 10.563°

Ecliptic λ, β

309.834° · 62.410°

HTM-20 index

-890317498