Key parameters at a glance

A radius of 1.33 Earth radii
A mass of 2.32 Earth masses
Surface gravity around 1.32 g
An orbital period of 11.392 days
Semi-major axis 0.0956 AU
Equilibrium temperature 886 K (613 °C)
Distance from Earth 1,314.24 light-years
Earth Similarity Index 0.353
Travel time at Voyager 1 speed 23,176,547 years

Kepler-1888 b Planet Profile

Physical Specs

Radius

1.33 R⊕

Radius (Jupiter)

0.118 R♃

Mass

2.32 M⊕

Mass (Jupiter)

0.007 M♃

Density

5.47 g/cm³

Surface Gravity

1.32 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.353

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

#1046of 1176

top 88.9%

This planet

1.33R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-1671 b 1.33 R⊕ LTT 3780 b 1.33 R⊕ L 98-59 c 1.33 R⊕

Metric	Earth	Kepler-1888 b	Jupiter
Radius (R⊕)	1.00	1.33	11.21
Mass (M⊕)	1.00	2.32	317.83
Density (g/cm³)	5.51	5.47	1.33
Surface Gravity (g)	1.00	1.32	2.53
Insolation (S⊕)	1.00	145.67	0.037

Star Catalogue Identifiers

TIC

TIC 122066892

Gaia DR2

Gaia DR2 2102245375949400960

Gaia DR3

Gaia DR3 2102245375949400960

System

Kepler-1888

Percentile among Super-Earth cohort

Radius 1.326 R⊕ · percentile 11 / cohort 1176

Mass 2.320 M⊕ · percentile 11 / cohort 1176

Orbital period 11.39 d · percentile 68 / cohort 1164

Distance 402.95 pc · percentile 40 / cohort 1171

ESI 0.353 · percentile 51 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

11.392 days

Semi-major axis

0.0956 AU

Eccentricity

0.000

Inclination

84.87 °

Year Length

A year here lasts approximately 11.39 Earth days (3.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0956 AU.

Transit Fingerprint

Depth

0.005 %

Duration

4.971 h

Impact parameter b

0.227

Rp / R★

0.006256

Transit midpoint (BJD)

2,454,974.5586

Photometric dip

Transit produces a flux drop of 47 ppm lasting ≈ 4.97 h.

Extended Orbital Architecture

Planet / star radius ratio

0.006256

Semi-major axis / stellar radius

17.180

Impact parameter (b)

0.227

Transit mid-time (BJD)

2,454,974.5586

Angular separation (arcsec)

0.23700

Eq. Temperature

886K

(613 °C)

Insolation (S⊕)

145.67

Earth = 1.00

Earth Similarity (ESI)

0.353

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-1888

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,557 K — cooler than the Sun (5,778 K)

Estimated Age

11.30 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.249 R☉

Stellar Mass

0.897 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.198 dex

Stellar density

0.125 g/cm³

Metallicity ratio

[Fe/H]

Distance

402.95 parsec

Light-years 1,314.24 ly

V-band magnitude

12.10 mag

Voyager-speed travel 23,176,547 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.453 mas

Total Proper Motion

31.032 mas/yr

PM Right Ascension

-24.41 mas/yr

PM Declination

-19.17 mas/yr

Galactic Cartesian (pc)

x = 0.248 · y = -0.703 · z = 0.666

Equatorial (J2000)

RA 289.39455° · Dec 41.78226°

Galactic ℓ, b

73.386° · 13.197°

Ecliptic λ, β

303.066° · 63.012°

HTM-20 index

-1485533455