Key parameters at a glance

A radius of 0.87 Earth radii
A mass of 0.59 Earth masses
Surface gravity around 0.78 g
An orbital period of 1.226 days
Semi-major axis 0.0218 AU
Equilibrium temperature 2,024 K (1751 °C)
Distance from Earth 2,227.26 light-years
Earth Similarity Index 0.138
Travel time at Voyager 1 speed 39,277,739 years

Kepler-1031 b Planet Profile

Physical Specs

Radius

0.87 R⊕

Radius (Jupiter)

0.078 R♃

Mass

0.59 M⊕

Mass (Jupiter)

0.002 M♃

Density

4.92 g/cm³

Surface Gravity

0.78 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.138

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 570

top 76.1%

This planet

0.87R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1152 b 0.87 R⊕ Kepler-607 b 0.87 R⊕ Kepler-1542 d 0.87 R⊕

Metric	Earth	Kepler-1031 b	Jupiter
Radius (R⊕)	1.00	0.87	11.21
Mass (M⊕)	1.00	0.59	317.83
Density (g/cm³)	5.51	4.92	1.33
Surface Gravity (g)	1.00	0.78	2.53
Insolation (S⊕)	1.00	3,973.86	0.037

Star Catalogue Identifiers

TIC

TIC 27769737

System

Kepler-1031

Percentile among Rocky Terrestrial cohort

Radius 0.870 R⊕ · percentile 23 / cohort 570

Mass 0.590 M⊕ · percentile 19 / cohort 570

Orbital period 1.23 d · percentile 14 / cohort 567

Distance 682.88 pc · percentile 79 / cohort 566

ESI 0.138 · percentile 4 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

1.226 days

Semi-major axis

0.0218 AU

Eccentricity

0.000

Inclination

89.93 °

Year Length

A year here lasts approximately 1.23 Earth days (0.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0218 AU.

Transit Fingerprint

Depth

0.006 %

Duration

2.149 h

Impact parameter b

0.005

Rp / R★

0.007188

Transit midpoint (BJD)

2,454,965.6868

Photometric dip

Transit produces a flux drop of 56 ppm lasting ≈ 2.15 h.

Extended Orbital Architecture

Planet / star radius ratio

0.007188

Semi-major axis / stellar radius

4.388

Impact parameter (b)

0.005

Transit mid-time (BJD)

2,454,965.6868

Angular separation (arcsec)

0.03190

Eq. Temperature

2,024K

(1751 °C)

Insolation (S⊕)

3,973.86

Earth = 1.00

Earth Similarity (ESI)

0.138

0 = alien, 1 = Earth-identical

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

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-1031

Spectral Class

F-type yellow-white

Effective Temperature

6,011 K — hotter than the Sun (5,778 K)

Estimated Age

3.39 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.120 R☉

Stellar Mass

1.090 M☉

Metallicity [Fe/H]

0.03

Extended Stellar Properties

Surface gravity (log g)

4.380 dex

Stellar density

1.063 g/cm³

Metallicity ratio

[Fe/H]

Distance

682.88 parsec

Light-years 2,227.26 ly

V-band magnitude

13.88 mag

Voyager-speed travel 39,277,739 yr

Multi-band Host Photometry — 15 bands

Astrometric Data

Total Proper Motion

10.851 mas/yr

PM Right Ascension

7.62 mas/yr

PM Declination

7.73 mas/yr

Galactic Cartesian (pc)

x = 0.289 · y = -0.590 · z = 0.754

Equatorial (J2000)

RA 296.08988° · Dec 48.95541°

Galactic ℓ, b

82.102° · 12.131°

Ecliptic λ, β

320.141° · 67.903°

HTM-20 index

1790464071