Key parameters at a glance

A radius of 1.05 Earth radii
A mass of 1.16 Earth masses
Surface gravity around 1.05 g
An orbital period of 0.789 days
Semi-major axis 0.0142 AU
Equilibrium temperature 1,244 K (971 °C)
Distance from Earth 1,041.08 light-years
Earth Similarity Index 0.253
Travel time at Voyager 1 speed 18,359,448 years
Almost certainly tidally locked to its host star given the close orbit

Kepler-1331 b Planet Profile

Physical Specs

Radius

1.05 R⊕

Radius (Jupiter)

0.094 R♃

Mass

1.16 M⊕

Mass (Jupiter)

0.004 M♃

Density

5.51 g/cm³

Surface Gravity

1.05 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.253

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

#279of 570

top 48.8%

This planet

1.05R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1376 b 1.05 R⊕ Kepler-625 c 1.05 R⊕ Kepler-163 b 1.05 R⊕

Metric	Earth	Kepler-1331 b	Jupiter
Radius (R⊕)	1.00	1.05	11.21
Mass (M⊕)	1.00	1.16	317.83
Density (g/cm³)	5.51	5.51	1.33
Surface Gravity (g)	1.00	1.05	2.53
Insolation (S⊕)	1.00	547.29	0.037

Star Catalogue Identifiers

TIC

TIC 169083837

Gaia DR2

Gaia DR2 2076790552200353536

Gaia DR3

Gaia DR3 2076790552200353536

System

Kepler-1331

Percentile among Rocky Terrestrial cohort

Radius 1.050 R⊕ · percentile 50 / cohort 570

Mass 1.160 M⊕ · percentile 45 / cohort 570

Orbital period 0.79 d · percentile 8 / cohort 567

Distance 319.20 pc · percentile 43 / cohort 566

ESI 0.253 · percentile 26 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

0.789 days

Semi-major axis

0.0142 AU

Eccentricity

0.000

Inclination

86.50 °

Year Length

A year here lasts roughly 18.9 hours long on a nearly circular orbit at a mean orbital distance of 0.0142 AU.

Transit Fingerprint

Depth

0.022 %

Duration

0.905 h

Impact parameter b

0.376

Rp / R★

0.014124

Transit midpoint (BJD)

2,454,964.5051

Photometric dip

Transit produces a flux drop of 215 ppm lasting ≈ 0.91 h.

Extended Orbital Architecture

Planet / star radius ratio

0.014124

Semi-major axis / stellar radius

6.662

Impact parameter (b)

0.376

Transit mid-time (BJD)

2,454,964.5051

Angular separation (arcsec)

0.04450

Eq. Temperature

1,244K

(971 °C)

Insolation (S⊕)

547.29

Earth = 1.00

Earth Similarity (ESI)

0.253

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-1331

Spectral Class

K-type orange

Effective Temperature

4,508 K — cooler than the Sun (5,778 K)

Estimated Age

4.17 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.690 R☉

Stellar Mass

0.720 M☉

Metallicity [Fe/H]

0.05

Extended Stellar Properties

Surface gravity (log g)

4.630 dex

Stellar density

7.088 g/cm³

Metallicity ratio

[Fe/H]

Distance

319.20 parsec

Light-years 1,041.08 ly

V-band magnitude

15.58 mag

Voyager-speed travel 18,359,448 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

3.104 mas

Total Proper Motion

5.074 mas/yr

PM Right Ascension

4.16 mas/yr

PM Declination

-2.91 mas/yr

Galactic Cartesian (pc)

x = 0.342 · y = -0.670 · z = 0.659

Equatorial (J2000)

RA 297.07379° · Dec 41.22446°

Galactic ℓ, b

75.544° · 7.824°

Ecliptic λ, β

314.172° · 60.578°

HTM-20 index

-962112541