Key parameters at a glance

A radius of 1.84 Earth radii
A mass of 4.04 Earth masses
Surface gravity around 1.19 g
An orbital period of 17.670 days
Semi-major axis 0.1348 AU
Equilibrium temperature 778 K (505 °C)
Distance from Earth 6,560.33 light-years
Earth Similarity Index 0.364
Travel time at Voyager 1 speed 115,691,491 years

Kepler-1125 b Planet Profile

Physical Specs

Radius

1.84 R⊕

Radius (Jupiter)

0.164 R♃

Mass

4.04 M⊕

Mass (Jupiter)

0.013 M♃

Density

3.56 g/cm³

Surface Gravity

1.19 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.364

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

#201of 1176

top 17.0%

This planet

1.84R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-52 c 1.84 R⊕ Kepler-354 b 1.84 R⊕ Kepler-1651 b 1.84 R⊕

Metric	Earth	Kepler-1125 b	Jupiter
Radius (R⊕)	1.00	1.84	11.21
Mass (M⊕)	1.00	4.04	317.83
Density (g/cm³)	5.51	3.56	1.33
Surface Gravity (g)	1.00	1.19	2.53
Insolation (S⊕)	1.00	41.04	0.037

Star Catalogue Identifiers

TIC

TIC 184009076

Gaia DR2

Gaia DR2 2076598687419100800

Gaia DR3

Gaia DR3 2076598687419100800

System

Kepler-1125

Percentile among Super-Earth cohort

Radius 1.840 R⊕ · percentile 82 / cohort 1176

Mass 4.040 M⊕ · percentile 75 / cohort 1176

Orbital period 17.67 d · percentile 82 / cohort 1164

Distance 2,011.41 pc · percentile 98 / cohort 1171

ESI 0.364 · percentile 54 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

17.670 days

Semi-major axis

0.1348 AU

Eccentricity

0.000

Inclination

83.69 °

Year Length

A year here lasts approximately 17.67 Earth days (4.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1348 AU.

Transit Fingerprint

Depth

0.035 %

Duration

5.772 h

Impact parameter b

0.510

Rp / R★

0.017672

Transit midpoint (BJD)

2,454,964.5980

Photometric dip

Transit produces a flux drop of 348 ppm lasting ≈ 5.77 h.

Extended Orbital Architecture

Planet / star radius ratio

0.017672

Semi-major axis / stellar radius

23.660

Impact parameter (b)

0.510

Transit mid-time (BJD)

2,454,964.5980

Angular separation (arcsec)

0.06700

Eq. Temperature

778K

(505 °C)

Insolation (S⊕)

41.04

Earth = 1.00

Earth Similarity (ESI)

0.364

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

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-1125

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,683 K — cooler than the Sun (5,778 K)

Estimated Age

4.17 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.940 R☉

Stellar Mass

0.950 M☉

Metallicity [Fe/H]

-0.09

Extended Stellar Properties

Surface gravity (log g)

4.470 dex

Stellar density

0.802 g/cm³

Metallicity ratio

[Fe/H]

Distance

2,011.41 parsec

Light-years 6,560.33 ly

V-band magnitude

15.04 mag

Voyager-speed travel 115,691,491 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.474 mas

Total Proper Motion

12.969 mas/yr

PM Right Ascension

-4.35 mas/yr

PM Declination

-12.22 mas/yr

Galactic Cartesian (pc)

x = 0.326 · y = -0.684 · z = 0.653

Equatorial (J2000)

RA 295.48120° · Dec 40.73193°

Galactic ℓ, b

74.520° · 8.637°

Ecliptic λ, β

311.529° · 60.549°

HTM-20 index

-1500431638