Key parameters at a glance

A radius of 1.54 Earth radii
A mass of 2.99 Earth masses
Surface gravity around 1.26 g
An orbital period of 2.326 days
Semi-major axis 0.0200 AU
Equilibrium temperature 550 K (277 °C)
Distance from Earth 168.30 light-years
Earth Similarity Index 0.540
Travel time at Voyager 1 speed 2,967,932 years
Almost certainly tidally locked to its host star given the close orbit

TOI-2266 b Planet Profile

Physical Specs

Radius

1.54 R⊕

Radius (Jupiter)

0.137 R♃

Mass

2.99 M⊕

Mass (Jupiter)

0.009 M♃

Density

4.50 g/cm³

Surface Gravity

1.26 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.540

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

#670of 1176

top 56.9%

This planet

1.54R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-337 b 1.54 R⊕ Kepler-274 b 1.54 R⊕ TOI-512 b 1.54 R⊕

Metric	Earth	TOI-2266 b	Jupiter
Radius (R⊕)	1.00	1.54	11.21
Mass (M⊕)	1.00	2.99	317.83
Density (g/cm³)	5.51	4.50	1.33
Surface Gravity (g)	1.00	1.26	2.53
Insolation (S⊕)	1.00	13.00	0.037

Star Catalogue Identifiers

TIC

TIC 8348911

Gaia DR2

Gaia DR2 1319243773843954304

Gaia DR3

Gaia DR3 1319243773843954304

System

TOI-2266

Percentile among Super-Earth cohort

Radius 1.540 R⊕ · percentile 42 / cohort 1176

Mass 2.990 M⊕ · percentile 38 / cohort 1176

Orbital period 2.33 d · percentile 14 / cohort 1164

Distance 51.60 pc · percentile 11 / cohort 1171

ESI 0.540 · percentile 76 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

2.326 days

Semi-major axis

0.0200 AU

Eccentricity

—

Inclination

88.51 °

Year Length

A year here lasts approximately 2.33 Earth days (0.6% of a terrestrial year) at a mean orbital distance of 0.0200 AU.

Transit Fingerprint

Depth

0.415 %

Duration

0.980 h

Impact parameter b

0.640

Rp / R★

0.058000

Transit midpoint (BJD)

2,459,255.6948

Photometric dip

Transit produces a flux drop of 4,154 ppm lasting ≈ 0.98 h.

Extended Orbital Architecture

Planet / star radius ratio

0.058000

Semi-major axis / stellar radius

18.430

Impact parameter (b)

0.640

Transit mid-time (BJD)

2,459,255.6948

Angular separation (arcsec)

0.38800

Eq. Temperature

550K

(277 °C)

Insolation (S⊕)

13.00

Earth = 1.00

Earth Similarity (ESI)

0.540

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

Parviainen et al. 2024

Instrument

TESS CCD Array

Publication

2024-01

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-2266

Spectral Class

M-type red dwarf

Effective Temperature

3,200 K — cooler than the Sun (5,778 K)

Estimated Age

0.30 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.240 R☉

Stellar Mass

0.230 M☉

Metallicity [Fe/H]

—

Distance

51.60 parsec

Light-years 168.30 ly

V-band magnitude

16.54 mag

Voyager-speed travel 2,967,932 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

19.351 mas

Total Proper Motion

60.728 mas/yr

PM Right Ascension

47.47 mas/yr

PM Declination

37.88 mas/yr

Galactic Cartesian (pc)

x = -0.356 · y = -0.774 · z = 0.524

Equatorial (J2000)

RA 245.28004° · Dec 31.57704°

Galactic ℓ, b

51.677° · 44.522°

Ecliptic λ, β

234.618° · 52.023°

HTM-20 index

-1573569121