Key parameters at a glance

A radius of 2.38 Earth radii
A mass of 6.28 Earth masses
Surface gravity around 1.10 g
An orbital period of 3.826 days
Semi-major axis 0.0465 AU
Equilibrium temperature 1,005 K (732 °C)
Distance from Earth 2,740.30 light-years
Earth Similarity Index 0.253
Travel time at Voyager 1 speed 48,325,258 years

Kepler-1872 b Planet Profile

Physical Specs

Radius

2.38 R⊕

Radius (Jupiter)

0.213 R♃

Mass

6.28 M⊕

Mass (Jupiter)

0.020 M♃

Density

2.55 g/cm³

Surface Gravity

1.10 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.253

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

#1362of 1978

top 68.8%

This planet

2.38R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1849 b 2.39 R⊕ Kepler-1824 b 2.38 R⊕ Kepler-1781 b 2.38 R⊕

Metric	Earth	Kepler-1872 b	Jupiter
Radius (R⊕)	1.00	2.38	11.21
Mass (M⊕)	1.00	6.28	317.83
Density (g/cm³)	5.51	2.55	1.33
Surface Gravity (g)	1.00	1.10	2.53
Insolation (S⊕)	1.00	241.25	0.037

Star Catalogue Identifiers

TIC

TIC 123230993

Gaia DR2

Gaia DR2 2116889775616597120

Gaia DR3

Gaia DR3 2116889775616597120

System

Kepler-1872

Percentile among Sub-Neptune cohort

Radius 2.384 R⊕ · percentile 31 / cohort 1978

Mass 6.280 M⊕ · percentile 30 / cohort 1978

Orbital period 3.83 d · percentile 8 / cohort 1946

Distance 840.18 pc · percentile 68 / cohort 1975

ESI 0.253 · percentile 17 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

3.826 days

Semi-major axis

0.0465 AU

Eccentricity

0.000

Inclination

81.86 °

Year Length

A year here lasts approximately 3.83 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0465 AU.

Transit Fingerprint

Depth

0.093 %

Duration

1.806 h

Impact parameter b

0.960

Rp / R★

0.027332

Transit midpoint (BJD)

2,454,965.1985

Photometric dip

Transit produces a flux drop of 934 ppm lasting ≈ 1.81 h.

Extended Orbital Architecture

Planet / star radius ratio

0.027332

Semi-major axis / stellar radius

5.600

Impact parameter (b)

0.960

Transit mid-time (BJD)

2,454,965.1985

Angular separation (arcsec)

0.05530

Eq. Temperature

1,005K

(732 °C)

Insolation (S⊕)

241.25

Earth = 1.00

Earth Similarity (ESI)

0.253

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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-1872

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,223 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.885 R☉

Stellar Mass

0.913 M☉

Metallicity [Fe/H]

0.32

Extended Stellar Properties

Surface gravity (log g)

4.505 dex

Stellar density

0.391 g/cm³

Metallicity ratio

[Fe/H]

Distance

840.18 parsec

Light-years 2,740.30 ly

V-band magnitude

15.97 mag

Voyager-speed travel 48,325,258 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.162 mas

Total Proper Motion

5.213 mas/yr

PM Right Ascension

5.05 mas/yr

PM Declination

1.28 mas/yr

Galactic Cartesian (pc)

x = 0.139 · y = -0.714 · z = 0.686

Equatorial (J2000)

RA 281.04920° · Dec 43.32260°

Galactic ℓ, b

72.467° · 19.470°

Ecliptic λ, β

290.039° · 65.995°

HTM-20 index

-665393586