Key parameters at a glance

A radius of 2.65 Earth radii
A mass of 7.53 Earth masses
Surface gravity around 1.07 g
An orbital period of 38.576 days
Semi-major axis 0.2333 AU
Equilibrium temperature 619 K (346 °C)
Distance from Earth 2,022.46 light-years
Earth Similarity Index 0.399
Travel time at Voyager 1 speed 35,666,151 years

Kepler-1931 b Planet Profile

Physical Specs

Radius

2.65 R⊕

Radius (Jupiter)

0.237 R♃

Mass

7.53 M⊕

Mass (Jupiter)

0.024 M♃

Density

2.22 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.399

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#943of 1978

top 47.6%

This planet

2.65R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-616 d 2.65 R⊕ Kepler-1924 b 2.65 R⊕ TOI-1064 c 2.65 R⊕

Metric	Earth	Kepler-1931 b	Jupiter
Radius (R⊕)	1.00	2.65	11.21
Mass (M⊕)	1.00	7.53	317.83
Density (g/cm³)	5.51	2.22	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	51.70	0.037

Star Catalogue Identifiers

TIC

TIC 159571280

Gaia DR2

Gaia DR2 2126061214423631232

Gaia DR3

Gaia DR3 2126061214423631232

System

Kepler-1931

Percentile among Sub-Neptune cohort

Radius 2.653 R⊕ · percentile 52 / cohort 1978

Mass 7.530 M⊕ · percentile 48 / cohort 1978

Orbital period 38.58 d · percentile 80 / cohort 1946

Distance 620.09 pc · percentile 54 / cohort 1975

ESI 0.399 · percentile 52 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

38.576 days

Semi-major axis

0.2333 AU

Eccentricity

0.000

Inclination

89.94 °

Year Length

A year here lasts approximately 38.58 Earth days (10.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2333 AU.

Transit Fingerprint

Depth

0.028 %

Duration

19.861 h

Impact parameter b

0.015

Rp / R★

0.015366

Transit midpoint (BJD)

2,455,000.8573

Photometric dip

Transit produces a flux drop of 282 ppm lasting ≈ 19.86 h.

Extended Orbital Architecture

Planet / star radius ratio

0.015366

Semi-major axis / stellar radius

15.076

Impact parameter (b)

0.015

Transit mid-time (BJD)

2,455,000.8573

Angular separation (arcsec)

0.37600

Eq. Temperature

619K

(346 °C)

Insolation (S⊕)

51.70

Earth = 1.00

Earth Similarity (ESI)

0.399

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

Valizadegan et al. 2022

Instrument

Kepler CCD Array

Publication

2022-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Kepler (12 shown).

Kepler-1816 b · Super-Earth Kepler-1705 c · Sub-Neptune Kepler-1948 b · Rocky Terrestrial Kepler-196 d · Sub-Neptune Kepler-1853 b · Super-Earth Kepler-1840 b · Sub-Neptune Kepler-1881 b · Sub-Neptune Kepler-1858 b · Sub-Neptune Kepler-1874 b · Sub-Neptune Kepler-1802 c · Sub-Neptune Kepler-1749 b · Super-Earth Kepler-1849 b · Sub-Neptune

Host System: Kepler-1931

Spectral Class

F-type yellow-white

Effective Temperature

6,167 K — hotter than the Sun (5,778 K)

Estimated Age

4.57 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.221 R☉

Stellar Mass

1.174 M☉

Metallicity [Fe/H]

0.12

Extended Stellar Properties

Surface gravity (log g)

4.333 dex

Stellar density

0.044 g/cm³

Metallicity ratio

[Fe/H]

Distance

620.09 parsec

Light-years 2,022.46 ly

V-band magnitude

12.67 mag

Voyager-speed travel 35,666,151 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.584 mas

Total Proper Motion

6.691 mas/yr

PM Right Ascension

3.89 mas/yr

PM Declination

5.45 mas/yr

Galactic Cartesian (pc)

x = 0.259 · y = -0.680 · z = 0.686

Equatorial (J2000)

RA 290.87231° · Dec 43.33301°

Galactic ℓ, b

75.300° · 12.866°

Ecliptic λ, β

306.468° · 64.153°

HTM-20 index

833703699