Key parameters at a glance

A radius of 1.77 Earth radii
A mass of 4.90 Earth masses
Surface gravity around 1.56 g
An orbital period of 5.880 days
Equilibrium temperature 511 K (238 °C)
Distance from Earth 92.58 light-years
Earth Similarity Index 0.564
Travel time at Voyager 1 speed 1,632,580 years
Almost certainly tidally locked to its host star given the close orbit

TOI-4529 b Planet Profile

Physical Specs

Radius

1.77 R⊕

Radius (Jupiter)

0.158 R♃

Mass

4.90 M⊕

Mass (Jupiter)

0.015 M♃

Density

4.80 g/cm³

Surface Gravity

1.56 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.564

HZ Position Inner

Controversial No

Discovery

Year 2026

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#293of 1176

top 24.8%

This planet

1.77R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

GJ 667 C c 1.77 R⊕ Kepler-286 e 1.77 R⊕ Kepler-215 c 1.77 R⊕

Metric	Earth	TOI-4529 b	Jupiter
Radius (R⊕)	1.00	1.77	11.21
Mass (M⊕)	1.00	4.90	317.83
Density (g/cm³)	5.51	4.80	1.33
Surface Gravity (g)	1.00	1.56	2.53
Insolation (S⊕)	1.00	14.61	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	4.900 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 384888319

Gaia DR2

Gaia DR2 2584622022068408576

Gaia DR3

Gaia DR3 2584622022068408576

System

TOI-4529

Percentile among Super-Earth cohort

Radius 1.770 R⊕ · percentile 73 / cohort 1176

Mass 4.900 M⊕ · percentile 92 / cohort 1176

Orbital period 5.88 d · percentile 46 / cohort 1164

Distance 28.38 pc · percentile 6 / cohort 1171

ESI 0.564 · percentile 79 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

5.880 days

Semi-major axis

— AU

Eccentricity

—

Inclination

88.70 °

Year Length

A year here lasts approximately 5.88 Earth days (1.6% of a terrestrial year).

Transit Fingerprint

Depth

0.135 %

Duration

2.078 h

Impact parameter b

0.320

Rp / R★

0.033800

Transit midpoint (BJD)

2,459,701.3329

Photometric dip

Transit produces a flux drop of 1,353 ppm lasting ≈ 2.08 h.

Extended Orbital Architecture

Planet / star radius ratio

0.033800

Semi-major axis / stellar radius

21.500

Impact parameter (b)

0.320

RV semi-amplitude (K)

0.950 m/s

Transit mid-time (BJD)

2,459,701.3329

Eq. Temperature

511K

(238 °C)

Insolation (S⊕)

14.61

Earth = 1.00

Earth Similarity (ESI)

0.564

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

Poultourtzidis et al. 2026

Instrument

TESS CCD Array

Publication

2026-01

Observation locale

Space

Discovery cohort

Planets confirmed in 2026 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-2094 b · Super-Earth TOI-6716 b · Rocky Terrestrial TOI-1080 b · Rocky Terrestrial TOI-1243 b · Sub-Neptune TOI-7384 b · Sub-Neptune LHS 1903 d · Sub-Neptune LHS 1903 c · Sub-Neptune TOI-5734 b · Sub-Neptune TOI-5788 c · Sub-Neptune LHS 1903 b · Super-Earth TOI-5788 b · Super-Earth TOI-1232 c · Neptune-like

Host System: TOI-4529

Spectral Class

M-type red dwarf

Effective Temperature

3,697 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.480 R☉

Stellar Mass

0.482 M☉

Metallicity [Fe/H]

-0.24

Extended Stellar Properties

Surface gravity (log g)

4.610 dex

Stellar density

6.100 g/cm³

Rotational v·sin i

2.00 km/s

Rotation period

20.70 days

Metallicity ratio

[Fe/H]

Distance

28.38 parsec

Light-years 92.58 ly

V-band magnitude

12.21 mag

Voyager-speed travel 1,632,580 yr

Multi-band Host Photometry — 7 bands

Astrometric Data

Parallax

35.202 mas

Total Proper Motion

277.063 mas/yr

PM Right Ascension

276.14 mas/yr

PM Declination

-22.64 mas/yr

Galactic Cartesian (pc)

x = 0.932 · y = 0.285 · z = 0.223

Equatorial (J2000)

RA 16.96885° · Dec 12.88095°

Galactic ℓ, b

129.144° · -49.792°

Ecliptic λ, β

20.555° · 5.242°

HTM-20 index

1199312109