Key parameters at a glance

A radius of 0.91 Earth radii
A mass of 0.69 Earth masses
Surface gravity around 0.83 g
An orbital period of 0.399 days
Semi-major axis 0.0083 AU
Equilibrium temperature 1,363 K (1090 °C)
Distance from Earth 59.05 light-years
Earth Similarity Index 0.223
Travel time at Voyager 1 speed 1,041,282 years
Almost certainly tidally locked to its host star given the close orbit

TOI-4527.01 Planet Profile

Physical Specs

Radius

0.91 R⊕

Radius (Jupiter)

0.081 R♃

Mass

0.69 M⊕

Mass (Jupiter)

0.002 M♃

Density

5.05 g/cm³

Surface Gravity

0.83 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.223

HZ Position Inner

Controversial No

Discovery

Year 2024

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#411of 570

top 71.9%

This planet

0.91R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

EPIC 201757695.02 0.91 R⊕ Kepler-1525 b 0.91 R⊕ Kepler-197 e 0.91 R⊕

Metric	Earth	TOI-4527.01	Jupiter
Radius (R⊕)	1.00	0.91	11.21
Mass (M⊕)	1.00	0.69	317.83
Density (g/cm³)	5.51	5.05	1.33
Surface Gravity (g)	1.00	0.83	2.53
Insolation (S⊕)	1.00	571.51	0.037

Star Catalogue Identifiers

HIP

HIP 6069

TIC

TIC 380887434

Gaia DR2

Gaia DR2 2564324345929277184

Gaia DR3

Gaia DR3 2564324345929277184

System

TOI-4527

Percentile among Rocky Terrestrial cohort

Radius 0.909 R⊕ · percentile 28 / cohort 570

Mass 0.689 M⊕ · percentile 24 / cohort 570

Orbital period 0.40 d · percentile 2 / cohort 567

Distance 18.10 pc · percentile 9 / cohort 566

ESI 0.223 · percentile 18 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

0.399 days

Semi-major axis

0.0083 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts roughly 9.6 hours long at a mean orbital distance of 0.0083 AU.

Transit Fingerprint

Depth

0.033 %

Duration

0.803 h

Rp / R★

0.017129

Transit midpoint (BJD)

2,459,474.2002

Photometric dip

Transit produces a flux drop of 331 ppm lasting ≈ 0.80 h.

Extended Orbital Architecture

Planet / star radius ratio

0.017129

Semi-major axis / stellar radius

3.689

Transit mid-time (BJD)

2,459,474.2002

Angular separation (arcsec)

0.46000

Eq. Temperature

1,363K

(1090 °C)

Insolation (S⊕)

571.51

Earth = 1.00

Earth Similarity (ESI)

0.223

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Hord et al. 2024

Instrument

TESS CCD Array

Publication

2024-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

Gliese 12 b · Rocky Terrestrial TOI-6002 b · Super-Earth TOI-5713 b · Super-Earth TOI-4336 A b · Sub-Neptune TOI-406.01 · Sub-Neptune TOI-1224 c · Sub-Neptune LHS 1678 d · Rocky Terrestrial TOI-2088 b · Sub-Neptune TOI-2120 b · Sub-Neptune TOI-1806.01 · Sub-Neptune TOI-4633 c · Sub-Neptune TOI-260 b · Super-Earth

Host System: TOI-4527

Spectral Class

M-type red dwarf

Effective Temperature

3,702 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.486 R☉

Stellar Mass

0.484 M☉

Metallicity [Fe/H]

—

Distance

18.10 parsec

Light-years 59.05 ly

V-band magnitude

10.92 mag

Voyager-speed travel 1,041,282 yr

Multi-band Host Photometry — 13 bands

Astrometric Data

Parallax

55.208 mas

Total Proper Motion

640.380 mas/yr

PM Right Ascension

87.77 mas/yr

PM Declination

-634.34 mas/yr

Galactic Cartesian (pc)

x = 0.939 · y = 0.332 · z = 0.095

Equatorial (J2000)

RA 19.47226° · Dec 5.47120°

Galactic ℓ, b

135.010° · -56.779°

Ecliptic λ, β

20.039° · -2.552°

HTM-20 index

-1400848629