Key parameters at a glance

A radius of 2.14 Earth radii
A mass of 3.33 Earth masses
Surface gravity around 0.73 g
An orbital period of 16.336 days
Semi-major axis 0.0849 AU
Equilibrium temperature 309 K (36 °C)
Distance from Earth 73.53 light-years
Earth Similarity Index 0.728
Travel time at Voyager 1 speed 1,296,763 years
Almost certainly tidally locked to its host star given the close orbit

1 sibling around TOI-4336 A

TOI-4336 A 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-4336 A c	Super-Earth	1.25	1.55	7.587	400	2026
TOI-4336 A b this	Sub-Neptune	2.14	3.33	16.336	309	2024

TOI-4336 A b Planet Profile

Physical Specs

Radius

2.14 R⊕

Radius (Jupiter)

0.191 R♃

Mass

3.33 M⊕

Mass (Jupiter)

0.010 M♃

Density

1.87 g/cm³

Surface Gravity

0.73 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.728

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

#1763of 1978

top 89.1%

This planet

2.14R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

GJ 433 d 2.14 R⊕ Kepler-437 b 2.14 R⊕ Kepler-813 b 2.14 R⊕

Metric	Earth	TOI-4336 A b	Jupiter
Radius (R⊕)	1.00	2.14	11.21
Mass (M⊕)	1.00	3.33	317.83
Density (g/cm³)	5.51	1.87	1.33
Surface Gravity (g)	1.00	0.73	2.53
Insolation (S⊕)	1.00	1.53	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	3.330 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 166184428

Gaia DR2

Gaia DR2 6113245033656232448

Gaia DR3

Gaia DR3 6113245033656232448

System

TOI-4336

Percentile among Sub-Neptune cohort

Radius 2.137 R⊕ · percentile 11 / cohort 1978

Mass 3.330 M⊕ · percentile 1 / cohort 1978

Orbital period 16.34 d · percentile 54 / cohort 1946

Distance 22.55 pc · percentile 5 / cohort 1975

ESI 0.728 · percentile 95 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

16.336 days

Semi-major axis

0.0849 AU

Eccentricity

0.000

Inclination

89.49 °

Year Length

A year here lasts approximately 16.34 Earth days (4.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0849 AU.

Transit Fingerprint

Depth

0.349 %

Duration

2.080 h

Impact parameter b

0.497

Rp / R★

0.060100

Transit midpoint (BJD)

2,459,335.5728

Photometric dip

Transit produces a flux drop of 3,487 ppm lasting ≈ 2.08 h.

Extended Orbital Architecture

Planet / star radius ratio

0.060100

Semi-major axis / stellar radius

57.160

Impact parameter (b)

0.497

RV semi-amplitude (K)

1.850 m/s

Transit mid-time (BJD)

2,459,335.5728

Long. of periastron (ω)

90.00°

Angular separation (arcsec)

3.77000

Eq. Temperature

309K

(36 °C)

Insolation (S⊕)

1.53

Earth = 1.00

Earth Similarity (ESI)

0.728

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure. 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

Timmermans et al. 2024

Instrument

TESS CCD Array

Publication

2024-04

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-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 TOI-663 d · Super-Earth

Host System: TOI-4336 A

Spectral Class

M-type red dwarf

Effective Temperature

3,307 K — cooler than the Sun (5,778 K)

Estimated Age

6.70 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.326 R☉

Stellar Mass

0.306 M☉

Metallicity [Fe/H]

0.14

Extended Stellar Properties

Surface gravity (log g)

4.897 dex

Stellar density

12.450 g/cm³

Systemic radial velocity

18.38 km/s

Rotation period

35.50 days

Metallicity ratio

[Fe/H]

Distance

22.55 parsec

Light-years 73.53 ly

V-band magnitude

13.60 mag

Voyager-speed travel 1,296,763 yr

Multi-band Host Photometry — 10 bands

Astrometric Data

Parallax

44.326 mas

Total Proper Motion

166.499 mas/yr

PM Right Ascension

151.52 mas/yr

PM Declination

69.02 mas/yr

Galactic Cartesian (pc)

x = -0.684 · y = -0.335 · z = -0.647

Equatorial (J2000)

RA 206.10701° · Dec -40.33735°

Galactic ℓ, b

313.747° · 21.419°

Ecliptic λ, β

219.545° · -27.416°

HTM-20 index

1544241962