Key parameters at a glance

A radius of 2.92 Earth radii
A mass of 8.88 Earth masses
Surface gravity around 1.04 g
An orbital period of 19.948 days
Semi-major axis 0.1421 AU
Equilibrium temperature 625 K (352 °C)
Distance from Earth 4,455.88 light-years
Earth Similarity Index 0.380
Travel time at Voyager 1 speed 78,579,405 years

Kepler-1887 b Planet Profile

Physical Specs

Radius

2.92 R⊕

Radius (Jupiter)

0.261 R♃

Mass

8.88 M⊕

Mass (Jupiter)

0.028 M♃

Density

1.95 g/cm³

Surface Gravity

1.04 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.380

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

#598of 1978

top 30.2%

This planet

2.92R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-824 b 2.93 R⊕ Kepler-1878 b 2.92 R⊕ Kepler-769 b 2.92 R⊕

Metric	Earth	Kepler-1887 b	Jupiter
Radius (R⊕)	1.00	2.92	11.21
Mass (M⊕)	1.00	8.88	317.83
Density (g/cm³)	5.51	1.95	1.33
Surface Gravity (g)	1.00	1.04	2.53
Insolation (S⊕)	1.00	36.14	0.037

Star Catalogue Identifiers

TIC

TIC 158844032

Gaia DR2

Gaia DR2 2127133753654360192

Gaia DR3

Gaia DR3 2127133753654360192

System

Kepler-1887

Percentile among Sub-Neptune cohort

Radius 2.925 R⊕ · percentile 70 / cohort 1978

Mass 8.880 M⊕ · percentile 64 / cohort 1978

Orbital period 19.95 d · percentile 62 / cohort 1946

Distance 1,366.18 pc · percentile 90 / cohort 1975

ESI 0.380 · percentile 48 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

19.948 days

Semi-major axis

0.1421 AU

Eccentricity

0.000

Inclination

89.94 °

Year Length

A year here lasts approximately 19.95 Earth days (5.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1421 AU.

Transit Fingerprint

Depth

0.086 %

Duration

1.756 h

Impact parameter b

0.020

Rp / R★

0.026742

Transit midpoint (BJD)

2,454,977.2469

Photometric dip

Transit produces a flux drop of 861 ppm lasting ≈ 1.76 h.

Extended Orbital Architecture

Planet / star radius ratio

0.026742

Semi-major axis / stellar radius

88.700

Impact parameter (b)

0.020

Transit mid-time (BJD)

2,454,977.2469

Angular separation (arcsec)

0.10400

Eq. Temperature

625K

(352 °C)

Insolation (S⊕)

36.14

Earth = 1.00

Earth Similarity (ESI)

0.380

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-1887

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

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

Estimated Age

0.50 Gyr — younger than the Sun (4.6 Gyr)

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

33.231 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,366.18 parsec

Light-years 4,455.88 ly

V-band magnitude

15.96 mag

Voyager-speed travel 78,579,405 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.704 mas

Total Proper Motion

8.850 mas/yr

PM Right Ascension

7.39 mas/yr

PM Declination

4.87 mas/yr

Galactic Cartesian (pc)

x = 0.231 · y = -0.672 · z = 0.703

Equatorial (J2000)

RA 288.95553° · Dec 44.70571°

Galactic ℓ, b

75.996° · 14.690°

Ecliptic λ, β

304.418° · 65.895°

HTM-20 index

1170284883