Key parameters at a glance

A radius of 3.97 Earth radii
A mass of 14.90 Earth masses
Surface gravity around 0.95 g
An orbital period of 60.450 days
Semi-major axis 0.2906 AU
Equilibrium temperature 491 K (218 °C)
Distance from Earth 253.36 light-years
Earth Similarity Index 0.417
Travel time at Voyager 1 speed 4,468,083 years

2 siblings around TOI-2141

TOI-2141 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
TOI-2141 c	Sub-Neptune	2.35	6.14	5.462	1,095	2025
TOI-2141 b	Sub-Neptune	3.15	20.10	18.262	728	2023
TOI-2141 d this	Sub-Neptune	3.97	14.90	60.450	491	2025

TOI-2141 d Planet Profile

Physical Specs

Radius

3.97 R⊕

Radius (Jupiter)

0.354 R♃

Mass

14.90 M⊕

Mass (Jupiter)

0.047 M♃

Density

1.31 g/cm³

Surface Gravity

0.95 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.417

HZ Position Inner

Controversial No

Discovery

Year 2025

Method Radial Velocity

Facility Roque de los Muchachos Observatory

Telescope 3.58 m Telescopio Nazionale Galileo

Size rank in cohort

Rank by radius

#2of 1978

top 0.1%

This planet

3.97R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

MOA-2016-BLG-526L b 3.97 R⊕ Kepler-149 d 3.96 R⊕ Kepler-976 b 3.96 R⊕

Metric	Earth	TOI-2141 d	Jupiter
Radius (R⊕)	1.00	3.97	11.21
Mass (M⊕)	1.00	14.90	317.83
Density (g/cm³)	5.51	1.31	1.33
Surface Gravity (g)	1.00	0.95	2.53
Insolation (S⊕)	1.00	9.80	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	14.900 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 287256467

Gaia DR2

Gaia DR2 4548496986402688384

Gaia DR3

Gaia DR3 4548496986402688384

System

TOI-2141

Percentile among Sub-Neptune cohort

Radius 3.970 R⊕ · percentile 100 / cohort 1978

Mass 14.900 M⊕ · percentile 93 / cohort 1978

Orbital period 60.45 d · percentile 89 / cohort 1946

Distance 77.68 pc · percentile 17 / cohort 1975

ESI 0.417 · percentile 56 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

60.450 days

Semi-major axis

0.2906 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 60.45 Earth days (16.6% of a terrestrial year) at a mean orbital distance of 0.2906 AU.

Extended Orbital Architecture

Semi-major axis / stellar radius

66.470

RV semi-amplitude (K)

2.610 m/s

Transit mid-time (BJD)

2,458,940.5000

Angular separation (arcsec)

3.74000

Eq. Temperature

491K

(218 °C)

Insolation (S⊕)

9.80

Earth = 1.00

Earth Similarity (ESI)

0.417

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

Discovery Paper

Primary reference

Luque et al. 2025

Instrument

HARPS-N Spectrograph

Publication

2025-08

Observation locale

Ground

Discovery cohort

Planets confirmed in 2025 at Roque de los Muchachos Observatory (3 shown).

TOI-1422 c · Sub-Neptune HD 224018 b · Rocky Terrestrial TOI-2141 c · Sub-Neptune

Host System: TOI-2141

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,635 K — cooler than the Sun (5,778 K)

Estimated Age

9.00 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.950 R☉

Stellar Mass

0.896 M☉

Metallicity [Fe/H]

-0.14

Extended Stellar Properties

Surface gravity (log g)

4.400 dex

Stellar density

1.521 g/cm³

Rotational v·sin i

2.70 km/s

Rotation period

21.00 days

Activity index (log R'HK)

-4.780

Metallicity ratio

[Fe/H]

Distance

77.68 parsec

Light-years 253.36 ly

V-band magnitude

9.46 mag

Voyager-speed travel 4,468,083 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

12.844 mas

Total Proper Motion

111.294 mas/yr

PM Right Ascension

52.12 mas/yr

PM Declination

-98.33 mas/yr

Galactic Cartesian (pc)

x = -0.185 · y = -0.931 · z = 0.315

Equatorial (J2000)

RA 258.76235° · Dec 18.34034°

Galactic ℓ, b

39.732° · 29.235°

Ecliptic λ, β

255.758° · 41.226°

HTM-20 index

206277409