Key parameters at a glance

A radius of 2.83 Earth radii
A mass of 8.40 Earth masses
Surface gravity around 1.05 g
An orbital period of 80.232 days
Semi-major axis 0.3543 AU
Equilibrium temperature 380 K (107 °C)
Distance from Earth 1,994.32 light-years
Earth Similarity Index 0.595
Travel time at Voyager 1 speed 35,169,774 years

Kepler-1789 b Planet Profile

Physical Specs

Radius

2.83 R⊕

Radius (Jupiter)

0.253 R♃

Mass

8.40 M⊕

Mass (Jupiter)

0.026 M♃

Density

2.03 g/cm³

Surface Gravity

1.05 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.595

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

#702of 1978

top 35.4%

This planet

2.83R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 3167 e 2.83 R⊕ GJ 3634 b 2.83 R⊕ Kepler-1099 b 2.83 R⊕

Metric	Earth	Kepler-1789 b	Jupiter
Radius (R⊕)	1.00	2.83	11.21
Mass (M⊕)	1.00	8.40	317.83
Density (g/cm³)	5.51	2.03	1.33
Surface Gravity (g)	1.00	1.05	2.53
Insolation (S⊕)	1.00	4.91	0.037

Star Catalogue Identifiers

TIC

TIC 377730967

Gaia DR2

Gaia DR2 2104539202019666432

Gaia DR3

Gaia DR3 2104539202019666432

System

Kepler-1789

Percentile among Sub-Neptune cohort

Radius 2.831 R⊕ · percentile 65 / cohort 1978

Mass 8.400 M⊕ · percentile 58 / cohort 1978

Orbital period 80.23 d · percentile 91 / cohort 1946

Distance 611.46 pc · percentile 54 / cohort 1975

ESI 0.595 · percentile 82 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

80.232 days

Semi-major axis

0.3543 AU

Eccentricity

0.000

Inclination

89.19 °

Year Length

A year here lasts approximately 80.23 Earth days (22.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3543 AU.

Transit Fingerprint

Depth

0.089 %

Duration

4.656 h

Impact parameter b

0.930

Rp / R★

0.037400

Transit midpoint (BJD)

2,454,995.3902

Photometric dip

Transit produces a flux drop of 889 ppm lasting ≈ 4.66 h.

Extended Orbital Architecture

Planet / star radius ratio

0.037400

Semi-major axis / stellar radius

60.000

Impact parameter (b)

0.930

Transit mid-time (BJD)

2,454,995.3902

Angular separation (arcsec)

0.57900

Eq. Temperature

380K

(107 °C)

Insolation (S⊕)

4.91

Earth = 1.00

Earth Similarity (ESI)

0.595

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-1789

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,436 K — cooler than the Sun (5,778 K)

Estimated Age

4.50 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.888 R☉

Stellar Mass

0.920 M☉

Metallicity [Fe/H]

0.12

Extended Stellar Properties

Surface gravity (log g)

4.505 dex

Stellar density

0.779 g/cm³

Metallicity ratio

[Fe/H]

Distance

611.46 parsec

Light-years 1,994.32 ly

V-band magnitude

14.45 mag

Voyager-speed travel 35,169,774 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.607 mas

Total Proper Motion

17.198 mas/yr

PM Right Ascension

-13.87 mas/yr

PM Declination

-10.16 mas/yr

Galactic Cartesian (pc)

x = 0.166 · y = -0.727 · z = 0.666

Equatorial (J2000)

RA 282.86314° · Dec 41.79663°

Galactic ℓ, b

71.440° · 17.690°

Ecliptic λ, β

292.444° · 64.237°

HTM-20 index

-1064466422