Key parameters at a glance

A radius of 2.08 Earth radii
A mass of 4.98 Earth masses
Surface gravity around 1.15 g
An orbital period of 17.137 days
Semi-major axis 0.1350 AU
Equilibrium temperature 775 K (502 °C)
Distance from Earth 5,601.66 light-years
Earth Similarity Index 0.350
Travel time at Voyager 1 speed 98,785,340 years

Kepler-1188 b Planet Profile

Physical Specs

Radius

2.08 R⊕

Radius (Jupiter)

0.186 R♃

Mass

4.98 M⊕

Mass (Jupiter)

0.016 M♃

Density

3.04 g/cm³

Surface Gravity

1.15 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.350

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

#1846of 1978

top 93.3%

This planet

2.08R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1195 b 2.08 R⊕ Kepler-405 b 2.08 R⊕ Kepler-237 c 2.08 R⊕

Metric	Earth	Kepler-1188 b	Jupiter
Radius (R⊕)	1.00	2.08	11.21
Mass (M⊕)	1.00	4.98	317.83
Density (g/cm³)	5.51	3.04	1.33
Surface Gravity (g)	1.00	1.15	2.53
Insolation (S⊕)	1.00	165.57	0.037

Star Catalogue Identifiers

TIC

TIC 164460740

Gaia DR2

Gaia DR2 2105000687666286592

Gaia DR3

Gaia DR3 2105000687666286592

System

Kepler-1188

Percentile among Sub-Neptune cohort

Radius 2.080 R⊕ · percentile 6 / cohort 1978

Mass 4.980 M⊕ · percentile 8 / cohort 1978

Orbital period 17.14 d · percentile 56 / cohort 1946

Distance 1,717.48 pc · percentile 95 / cohort 1975

ESI 0.350 · percentile 41 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

17.137 days

Semi-major axis

0.1350 AU

Eccentricity

0.000

Inclination

89.92 °

Year Length

A year here lasts approximately 17.14 Earth days (4.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1350 AU.

Transit Fingerprint

Depth

0.036 %

Duration

6.366 h

Impact parameter b

0.692

Rp / R★

0.018245

Transit midpoint (BJD)

2,454,974.0137

Photometric dip

Transit produces a flux drop of 362 ppm lasting ≈ 6.37 h.

Extended Orbital Architecture

Planet / star radius ratio

0.018245

Semi-major axis / stellar radius

20.762

Impact parameter (b)

0.692

Transit mid-time (BJD)

2,454,974.0137

Angular separation (arcsec)

0.07860

Eq. Temperature

775K

(502 °C)

Insolation (S⊕)

165.57

Earth = 1.00

Earth Similarity (ESI)

0.350

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-1188

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,913 K — hotter than the Sun (5,778 K)

Estimated Age

4.17 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.060 R☉

Stellar Mass

1.040 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.400 dex

Stellar density

0.583 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,717.48 parsec

Light-years 5,601.66 ly

V-band magnitude

14.94 mag

Voyager-speed travel 98,785,340 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.553 mas

Total Proper Motion

4.845 mas/yr

PM Right Ascension

3.72 mas/yr

PM Declination

3.10 mas/yr

Galactic Cartesian (pc)

x = 0.165 · y = -0.711 · z = 0.684

Equatorial (J2000)

RA 283.10384° · Dec 43.14805°

Galactic ℓ, b

72.834° · 18.003°

Ecliptic λ, β

293.524° · 65.521°

HTM-20 index

771503051