Key parameters at a glance

A radius of 0.99 Earth radii
A mass of 2.31 Earth masses
Surface gravity around 2.34 g
An orbital period of 11.307 days
Semi-major axis 0.0924 AU
Equilibrium temperature 603 K (330 °C)
Distance from Earth 195.24 light-years
Earth Similarity Index 0.456
Travel time at Voyager 1 speed 3,443,061 years
Almost certainly tidally locked to its host star given the close orbit

1 sibling around TOI-2322

TOI-2322 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
TOI-2322 b this	Rocky Terrestrial	0.99	2.31	11.307	603	2025
TOI-2322 c	Super-Earth	1.87	18.10	20.226	497	2025

TOI-2322 b Planet Profile

Physical Specs

Radius

0.99 R⊕

Radius (Jupiter)

0.089 R♃

Mass

2.31 M⊕

Mass (Jupiter)

0.007 M♃

Density

12.75 g/cm³

Surface Gravity

2.34 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.456

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

#344of 570

top 60.2%

This planet

0.99R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1800 b 1.00 R⊕ LHS 475 b 0.99 R⊕ TOI-5388.01 0.99 R⊕

Metric	Earth	TOI-2322 b	Jupiter
Radius (R⊕)	1.00	0.99	11.21
Mass (M⊕)	1.00	2.31	317.83
Density (g/cm³)	5.51	12.75	1.33
Surface Gravity (g)	1.00	2.34	2.53
Insolation (S⊕)	1.00	22.04	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	2.310 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 300812741

Gaia DR2

Gaia DR2 5264331179802870016

Gaia DR3

Gaia DR3 5264331179802870016

System

TOI-2322

Percentile among Rocky Terrestrial cohort

Radius 0.994 R⊕ · percentile 40 / cohort 570

Mass 2.310 M⊕ · percentile 92 / cohort 570

Orbital period 11.31 d · percentile 81 / cohort 567

Distance 59.86 pc · percentile 18 / cohort 566

ESI 0.456 · percentile 66 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

11.307 days

Semi-major axis

0.0924 AU

Eccentricity

0.000

Inclination

89.57 °

Year Length

A year here lasts approximately 11.31 Earth days (3.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0924 AU.

Transit Fingerprint

Depth

0.026 %

Duration

2.800 h

Impact parameter b

0.230

Transit midpoint (BJD)

2,460,160.4469

Photometric dip

Transit produces a flux drop of 264 ppm lasting ≈ 2.80 h.

Extended Orbital Architecture

Impact parameter (b)

0.230

RV semi-amplitude (K)

0.840 m/s

Transit mid-time (BJD)

2,460,160.4469

Long. of periastron (ω)

90.00°

Angular separation (arcsec)

1.54000

Eq. Temperature

603K

(330 °C)

Insolation (S⊕)

22.04

Earth = 1.00

Earth Similarity (ESI)

0.456

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.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Radial velocity

Stellar wobble has been measured spectroscopically.

Discovery Paper

Primary reference

Hobson et al. 2025

Instrument

TESS CCD Array

Publication

2025-08

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 TOI-4364 b · Sub-Neptune

Host System: TOI-2322

Spectral Class

K-type orange

Effective Temperature

4,664 K — cooler than the Sun (5,778 K)

Estimated Age

3.90 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.662 R☉

Stellar Mass

0.703 M☉

Metallicity [Fe/H]

-0.12

Extended Stellar Properties

Surface gravity (log g)

4.570 dex

Stellar density

2.908 g/cm³

Rotation period

21.28 days

Activity index (log R'HK)

-4.587

Metallicity ratio

[Fe/H]

Distance

59.86 parsec

Light-years 195.24 ly

V-band magnitude

10.91 mag

Voyager-speed travel 3,443,061 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

16.676 mas

Total Proper Motion

53.887 mas/yr

PM Right Ascension

7.87 mas/yr

PM Declination

-53.31 mas/yr

Galactic Cartesian (pc)

x = -0.148 · y = 0.290 · z = -0.946

Equatorial (J2000)

RA 116.97310° · Dec -71.00197°

Galactic ℓ, b

283.148° · -21.131°

Ecliptic λ, β

216.663° · -79.392°

HTM-20 index

-1385900094