Key parameters at a glance

A radius of 2.01 Earth radii
A mass of 4.70 Earth masses
Surface gravity around 1.16 g
An orbital period of 5.424 days
Semi-major axis 0.0475 AU
Equilibrium temperature 488 K (215 °C)
Distance from Earth 143.40 light-years
Earth Similarity Index 0.550
Travel time at Voyager 1 speed 2,528,831 years
Almost certainly tidally locked to its host star given the close orbit

TOI-4364 b Planet Profile

Physical Specs

Radius

2.01 R⊕

Radius (Jupiter)

0.179 R♃

Mass

4.70 M⊕

Mass (Jupiter)

0.015 M♃

Density

3.18 g/cm³

Surface Gravity

1.16 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.550

HZ Position Inner

Controversial No

Discovery

Year 2025

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#1940of 1978

top 98.0%

This planet

2.01R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-415 c 2.01 R⊕ Kepler-260 b 2.01 R⊕ Kepler-280 c 2.01 R⊕

Metric	Earth	TOI-4364 b	Jupiter
Radius (R⊕)	1.00	2.01	11.21
Mass (M⊕)	1.00	4.70	317.83
Density (g/cm³)	5.51	3.18	1.33
Surface Gravity (g)	1.00	1.16	2.53
Insolation (S⊕)	1.00	13.33	0.037

Star Catalogue Identifiers

TIC

TIC 4070275

Gaia DR2

Gaia DR2 3210444215030339584

Gaia DR3

Gaia DR3 3210444215030339584

System

TOI-4364

Percentile among Sub-Neptune cohort

Radius 2.010 R⊕ · percentile 1 / cohort 1978

Mass 4.700 M⊕ · percentile 3 / cohort 1978

Orbital period 5.42 d · percentile 14 / cohort 1946

Distance 43.97 pc · percentile 11 / cohort 1975

ESI 0.550 · percentile 76 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

5.424 days

Semi-major axis

0.0475 AU

Eccentricity

0.290

Inclination

88.68 °

Year Length

A year here lasts approximately 5.42 Earth days (1.5% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0475 AU.

Transit Fingerprint

Depth

0.178 %

Duration

1.600 h

Rp / R★

0.039400

Transit midpoint (BJD)

2,458,439.3428

Photometric dip

Transit produces a flux drop of 1,780 ppm lasting ≈ 1.60 h.

Extended Orbital Architecture

Planet / star radius ratio

0.039400

Semi-major axis / stellar radius

21.830

Transit mid-time (BJD)

2,458,439.3428

Long. of periastron (ω)

-190.00°

Angular separation (arcsec)

1.08000

Eq. Temperature

488K

(215 °C)

Insolation (S⊕)

13.33

Earth = 1.00

Earth Similarity (ESI)

0.550

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Distler et al. 2025

Instrument

TESS CCD Array

Publication

2025-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-1266 d · Super-Earth TOI-2267 c · Rocky Terrestrial TOI-5799 c · Super-Earth TOI-5728 b · Super-Earth TOI-5716 b · Rocky Terrestrial TOI-7166 b · Sub-Neptune TOI-2267 b · Rocky Terrestrial TOI-2093 c · Sub-Neptune TOI-2267 d · Super-Earth TOI-5489 c · Super-Earth TOI-1743 b · Super-Earth HD 35843 c · Sub-Neptune

Host System: TOI-4364

Spectral Class

M-type red dwarf

Effective Temperature

3,528 K — cooler than the Sun (5,778 K)

Estimated Age

0.71 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.468 R☉

Stellar Mass

0.487 M☉

Metallicity [Fe/H]

0.15

Extended Stellar Properties

Surface gravity (log g)

4.785 dex

Stellar density

6.690 g/cm³

Systemic radial velocity

44.77 km/s

Rotation period

10.57 days

Metallicity ratio

[Fe/H]

Distance

43.97 parsec

Light-years 143.40 ly

V-band magnitude

13.56 mag

Voyager-speed travel 2,528,831 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

22.716 mas

Total Proper Motion

77.799 mas/yr

PM Right Ascension

64.29 mas/yr

PM Declination

43.81 mas/yr

Galactic Cartesian (pc)

x = 0.172 · y = 0.982 · z = -0.074

Equatorial (J2000)

RA 80.06693° · Dec -4.23925°

Galactic ℓ, b

206.086° · -22.181°

Ecliptic λ, β

78.834° · -27.294°

HTM-20 index

-200535343