Key parameters at a glance

A radius of 1.83 Earth radii
A mass of 4.01 Earth masses
Surface gravity around 1.20 g
An orbital period of 8.935 days
Semi-major axis 0.0928 AU
Equilibrium temperature 1,124 K (851 °C)
Distance from Earth 3,060.70 light-years
Earth Similarity Index 0.246
Travel time at Voyager 1 speed 53,975,501 years

1 sibling around Kepler-1181

Kepler-1181 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-1181 b	Super-Earth	1.57	3.09	4.893	1,374	2016
Kepler-1181 c this	Super-Earth	1.83	4.01	8.935	1,124	2023

Kepler-1181 c Planet Profile

Physical Specs

Radius

1.83 R⊕

Radius (Jupiter)

0.163 R♃

Mass

4.01 M⊕

Mass (Jupiter)

0.013 M♃

Density

3.60 g/cm³

Surface Gravity

1.20 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.246

HZ Position Inner

Controversial No

Discovery

Year 2023

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#221of 1176

top 18.7%

This planet

1.83R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

WASP-47 e 1.83 R⊕ Kepler-110 b 1.83 R⊕ K2-316 c 1.83 R⊕

Metric	Earth	Kepler-1181 c	Jupiter
Radius (R⊕)	1.00	1.83	11.21
Mass (M⊕)	1.00	4.01	317.83
Density (g/cm³)	5.51	3.60	1.33
Surface Gravity (g)	1.00	1.20	2.53
Insolation (S⊕)	1.00	377.25	0.037

Star Catalogue Identifiers

TIC

TIC 394176812

Gaia DR2

Gaia DR2 2101035367703145088

Gaia DR3

Gaia DR3 2101035367703145088

System

Kepler-1181

Percentile among Super-Earth cohort

Radius 1.830 R⊕ · percentile 80 / cohort 1176

Mass 4.010 M⊕ · percentile 74 / cohort 1176

Orbital period 8.93 d · percentile 61 / cohort 1164

Distance 938.42 pc · percentile 77 / cohort 1171

ESI 0.246 · percentile 22 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

8.935 days

Semi-major axis

0.0928 AU

Eccentricity

0.000

Inclination

86.05 °

Year Length

A year here lasts approximately 8.93 Earth days (2.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0928 AU.

Transit Fingerprint

Depth

0.014 %

Duration

2.579 h

Impact parameter b

0.888

Rp / R★

0.012415

Transit midpoint (BJD)

2,454,966.3911

Photometric dip

Transit produces a flux drop of 136 ppm lasting ≈ 2.58 h.

Extended Orbital Architecture

Planet / star radius ratio

0.012415

Semi-major axis / stellar radius

12.890

Impact parameter (b)

0.888

Transit mid-time (BJD)

2,454,966.3911

Angular separation (arcsec)

0.09890

Eq. Temperature

1,124K

(851 °C)

Insolation (S⊕)

377.25

Earth = 1.00

Earth Similarity (ESI)

0.246

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Valizadegan et al. 2023

Instrument

Kepler CCD Array

Publication

2023-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2023 at Kepler (12 shown).

Kepler-1126 c · Super-Earth Kepler-2000 c · Super-Earth Kepler-1052 c · Sub-Neptune Kepler-311 d · Sub-Neptune Kepler-1996 c · Sub-Neptune Kepler-1162 c · Super-Earth Kepler-1996 b · Sub-Neptune Kepler-1610 c · Sub-Neptune Kepler-1801 c · Sub-Neptune Kepler-1995 b · Neptune-like Kepler-1992 b · Rocky Terrestrial Kepler-1986 b · Super-Earth

Host System: Kepler-1181

Spectral Class

F-type yellow-white

Effective Temperature

6,688 K — hotter than the Sun (5,778 K)

Estimated Age

3.24 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.347 R☉

Stellar Mass

1.336 M☉

Metallicity [Fe/H]

0.07

Extended Stellar Properties

Surface gravity (log g)

4.304 dex

Stellar density

0.507 g/cm³

Metallicity ratio

[Fe/H]

Distance

938.42 parsec

Light-years 3,060.70 ly

V-band magnitude

13.55 mag

Voyager-speed travel 53,975,501 yr

Multi-band Host Photometry — 15 bands

Astrometric Data

Parallax

1.037 mas

Total Proper Motion

8.542 mas/yr

PM Right Ascension

0.76 mas/yr

PM Declination

-8.51 mas/yr

Galactic Cartesian (pc)

x = 0.261 · y = -0.726 · z = 0.636

Equatorial (J2000)

RA 289.74732° · Dec 39.52341°

Galactic ℓ, b

71.405° · 11.997°

Ecliptic λ, β

302.253° · 60.770°

HTM-20 index

-894083530