Key parameters at a glance

A radius of 0.75 Earth radii
A mass of 0.35 Earth masses
Surface gravity around 0.62 g
An orbital period of 3.882 days
Semi-major axis 0.0490 AU
Equilibrium temperature 1,156 K (883 °C)
Distance from Earth 974.86 light-years
Earth Similarity Index 0.255
Travel time at Voyager 1 speed 17,191,668 years

Kepler-1864 b Planet Profile

Physical Specs

Radius

0.75 R⊕

Radius (Jupiter)

0.067 R♃

Mass

0.35 M⊕

Mass (Jupiter)

0.001 M♃

Density

4.52 g/cm³

Surface Gravity

0.62 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.255

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

#507of 570

top 88.8%

This planet

0.75R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

TRAPPIST-1 h 0.76 R⊕ Kepler-37 c 0.76 R⊕ Kepler-1563 b 0.75 R⊕

Metric	Earth	Kepler-1864 b	Jupiter
Radius (R⊕)	1.00	0.75	11.21
Mass (M⊕)	1.00	0.35	317.83
Density (g/cm³)	5.51	4.52	1.33
Surface Gravity (g)	1.00	0.62	2.53
Insolation (S⊕)	1.00	427.60	0.037

Star Catalogue Identifiers

TIC

TIC 394172692

Gaia DR2

Gaia DR2 2101485548995660416

Gaia DR3

Gaia DR3 2101485548995660416

System

Kepler-1864

Percentile among Rocky Terrestrial cohort

Radius 0.754 R⊕ · percentile 11 / cohort 570

Mass 0.353 M⊕ · percentile 9 / cohort 570

Orbital period 3.88 d · percentile 42 / cohort 567

Distance 298.89 pc · percentile 41 / cohort 566

ESI 0.255 · percentile 26 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

3.882 days

Semi-major axis

0.0490 AU

Eccentricity

0.000

Inclination

88.66 °

Year Length

A year here lasts approximately 3.88 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0490 AU.

Transit Fingerprint

Depth

0.004 %

Duration

2.797 h

Impact parameter b

0.252

Rp / R★

0.005972

Transit midpoint (BJD)

2,454,968.1178

Photometric dip

Transit produces a flux drop of 43 ppm lasting ≈ 2.80 h.

Extended Orbital Architecture

Planet / star radius ratio

0.005972

Semi-major axis / stellar radius

10.680

Impact parameter (b)

0.252

Transit mid-time (BJD)

2,454,968.1178

Angular separation (arcsec)

0.16400

Eq. Temperature

1,156K

(883 °C)

Insolation (S⊕)

427.60

Earth = 1.00

Earth Similarity (ESI)

0.255

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-1864

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,854 K — hotter than the Sun (5,778 K)

Estimated Age

1.62 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.979 R☉

Stellar Mass

1.030 M☉

Metallicity [Fe/H]

0.06

Extended Stellar Properties

Surface gravity (log g)

4.469 dex

Stellar density

1.579 g/cm³

Metallicity ratio

[Fe/H]

Distance

298.89 parsec

Light-years 974.86 ly

V-band magnitude

12.12 mag

Voyager-speed travel 17,191,668 yr

Multi-band Host Photometry — 15 bands

Astrometric Data

Parallax

3.317 mas

Total Proper Motion

10.645 mas/yr

PM Right Ascension

10.30 mas/yr

PM Declination

-2.69 mas/yr

Galactic Cartesian (pc)

x = 0.252 · y = -0.704 · z = 0.664

Equatorial (J2000)

RA 289.68677° · Dec 41.58892°

Galactic ℓ, b

73.300° · 12.917°

Ecliptic λ, β

303.400° · 62.764°

HTM-20 index

-1506691222