Key parameters at a glance

A radius of 2.94 Earth radii
A mass of 8.98 Earth masses
Surface gravity around 1.04 g
An orbital period of 37.304 days
Semi-major axis 0.2082 AU
Equilibrium temperature 493 K (220 °C)
Distance from Earth 4,550.30 light-years
Earth Similarity Index 0.471
Travel time at Voyager 1 speed 80,244,540 years

Kepler-1889 b Planet Profile

Physical Specs

Radius

2.94 R⊕

Radius (Jupiter)

0.263 R♃

Mass

8.98 M⊕

Mass (Jupiter)

0.028 M♃

Density

1.93 g/cm³

Surface Gravity

1.04 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.471

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

#568of 1978

top 28.7%

This planet

2.94R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1914 b 2.94 R⊕ K2-372 b 2.95 R⊕ Kepler-1757 b 2.95 R⊕

Metric	Earth	Kepler-1889 b	Jupiter
Radius (R⊕)	1.00	2.94	11.21
Mass (M⊕)	1.00	8.98	317.83
Density (g/cm³)	5.51	1.93	1.33
Surface Gravity (g)	1.00	1.04	2.53
Insolation (S⊕)	1.00	14.00	0.037

Star Catalogue Identifiers

TIC

TIC 169178161

Gaia DR2

Gaia DR2 2076787116226614272

Gaia DR3

Gaia DR3 2076787116226614272

System

Kepler-1889

Percentile among Sub-Neptune cohort

Radius 2.944 R⊕ · percentile 71 / cohort 1978

Mass 8.980 M⊕ · percentile 65 / cohort 1978

Orbital period 37.30 d · percentile 79 / cohort 1946

Distance 1,395.13 pc · percentile 91 / cohort 1975

ESI 0.471 · percentile 66 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

37.304 days

Semi-major axis

0.2082 AU

Eccentricity

0.000

Inclination

87.03 °

Year Length

A year here lasts approximately 37.30 Earth days (10.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2082 AU.

Transit Fingerprint

Depth

0.055 %

Duration

7.793 h

Impact parameter b

0.020

Rp / R★

0.029056

Transit midpoint (BJD)

2,454,966.3150

Photometric dip

Transit produces a flux drop of 552 ppm lasting ≈ 7.79 h.

Extended Orbital Architecture

Planet / star radius ratio

0.029056

Semi-major axis / stellar radius

15.400

Impact parameter (b)

0.020

Transit mid-time (BJD)

2,454,966.3150

Angular separation (arcsec)

0.14900

Eq. Temperature

493K

(220 °C)

Insolation (S⊕)

14.00

Earth = 1.00

Earth Similarity (ESI)

0.471

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-1889

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,646 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.817 R☉

Stellar Mass

0.864 M☉

Metallicity [Fe/H]

-0.28

Extended Stellar Properties

Surface gravity (log g)

4.550 dex

Stellar density

0.073 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,395.13 parsec

Light-years 4,550.30 ly

V-band magnitude

15.72 mag

Voyager-speed travel 80,244,540 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.690 mas

Total Proper Motion

1.653 mas/yr

PM Right Ascension

-1.63 mas/yr

PM Declination

-0.25 mas/yr

Galactic Cartesian (pc)

x = 0.344 · y = -0.669 · z = 0.659

Equatorial (J2000)

RA 297.19926° · Dec 41.22644°

Galactic ℓ, b

75.592° · 7.743°

Ecliptic λ, β

314.352° · 60.545°

HTM-20 index

-952214448