Key parameters at a glance

A radius of 2.05 Earth radii
A mass of 4.86 Earth masses
Surface gravity around 1.16 g
An orbital period of 9.329 days
Semi-major axis 0.0856 AU
Equilibrium temperature 806 K (533 °C)
Distance from Earth 4,306.50 light-years
Earth Similarity Index 0.338
Travel time at Voyager 1 speed 75,945,098 years

Kepler-1958 b Planet Profile

Physical Specs

Radius

2.05 R⊕

Radius (Jupiter)

0.183 R♃

Mass

4.86 M⊕

Mass (Jupiter)

0.015 M♃

Density

3.09 g/cm³

Surface Gravity

1.16 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.338

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

#1886of 1978

top 95.3%

This planet

2.05R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-321 b 2.05 R⊕ Kepler-337 c 2.05 R⊕ Kepler-363 d 2.05 R⊕

Metric	Earth	Kepler-1958 b	Jupiter
Radius (R⊕)	1.00	2.05	11.21
Mass (M⊕)	1.00	4.86	317.83
Density (g/cm³)	5.51	3.09	1.33
Surface Gravity (g)	1.00	1.16	2.53
Insolation (S⊕)	1.00	99.60	0.037

Star Catalogue Identifiers

TIC

TIC 121943923

Gaia DR2

Gaia DR2 2102249812654697472

Gaia DR3

Gaia DR3 2102249812654697472

System

Kepler-1958

Percentile among Sub-Neptune cohort

Radius 2.051 R⊕ · percentile 5 / cohort 1978

Mass 4.860 M⊕ · percentile 6 / cohort 1978

Orbital period 9.33 d · percentile 31 / cohort 1946

Distance 1,320.38 pc · percentile 89 / cohort 1975

ESI 0.338 · percentile 37 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

9.329 days

Semi-major axis

0.0856 AU

Eccentricity

0.000

Inclination

89.96 °

Year Length

A year here lasts approximately 9.33 Earth days (2.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0856 AU.

Transit Fingerprint

Depth

0.035 %

Duration

1.663 h

Impact parameter b

0.035

Rp / R★

0.017656

Transit midpoint (BJD)

2,454,968.8751

Photometric dip

Transit produces a flux drop of 354 ppm lasting ≈ 1.66 h.

Extended Orbital Architecture

Planet / star radius ratio

0.017656

Semi-major axis / stellar radius

46.090

Impact parameter (b)

0.035

Transit mid-time (BJD)

2,454,968.8751

Angular separation (arcsec)

0.06480

Eq. Temperature

806K

(533 °C)

Insolation (S⊕)

99.60

Earth = 1.00

Earth Similarity (ESI)

0.338

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-1958

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,749 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.864 R☉

Stellar Mass

0.961 M☉

Metallicity [Fe/H]

-0.10

Extended Stellar Properties

Surface gravity (log g)

4.547 dex

Stellar density

21.279 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,320.38 parsec

Light-years 4,306.50 ly

V-band magnitude

15.49 mag

Voyager-speed travel 75,945,098 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.729 mas

Total Proper Motion

6.217 mas/yr

PM Right Ascension

-2.59 mas/yr

PM Declination

-5.65 mas/yr

Galactic Cartesian (pc)

x = 0.244 · y = -0.706 · z = 0.665

Equatorial (J2000)

RA 289.10416° · Dec 41.69011°

Galactic ℓ, b

73.207° · 13.355°

Ecliptic λ, β

302.550° · 62.987°

HTM-20 index

-1483420484