Key parameters at a glance

A radius of 2.35 Earth radii
A mass of 6.14 Earth masses
Surface gravity around 1.11 g
An orbital period of 5.462 days
Semi-major axis 0.0585 AU
Equilibrium temperature 1,095 K (822 °C)
Distance from Earth 253.36 light-years
Earth Similarity Index 0.232
Travel time at Voyager 1 speed 4,468,083 years

2 siblings around TOI-2141

TOI-2141 c 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 this	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	Sub-Neptune	3.97	14.90	60.450	491	2025

TOI-2141 c Planet Profile

Physical Specs

Radius

2.35 R⊕

Radius (Jupiter)

0.210 R♃

Mass

6.14 M⊕

Mass (Jupiter)

0.019 M♃

Density

2.60 g/cm³

Surface Gravity

1.11 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.232

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

#1416of 1978

top 71.5%

This planet

2.35R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-172 b 2.35 R⊕ Kepler-216 b 2.35 R⊕ Kepler-306 c 2.35 R⊕

Metric	Earth	TOI-2141 c	Jupiter
Radius (R⊕)	1.00	2.35	11.21
Mass (M⊕)	1.00	6.14	317.83
Density (g/cm³)	5.51	2.60	1.33
Surface Gravity (g)	1.00	1.11	2.53
Insolation (S⊕)	1.00	241.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	6.140 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 2.350 R⊕ · percentile 28 / cohort 1978

Mass 6.140 M⊕ · percentile 28 / cohort 1978

Orbital period 5.46 d · percentile 14 / cohort 1946

Distance 77.68 pc · percentile 17 / cohort 1975

ESI 0.232 · percentile 12 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

5.462 days

Semi-major axis

0.0585 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 5.46 Earth days (1.5% of a terrestrial year) at a mean orbital distance of 0.0585 AU.

Extended Orbital Architecture

Semi-major axis / stellar radius

13.390

RV semi-amplitude (K)

2.400 m/s

Transit mid-time (BJD)

2,458,979.1900

Angular separation (arcsec)

0.75300

Eq. Temperature

1,095K

(822 °C)

Insolation (S⊕)

241.00

Earth = 1.00

Earth Similarity (ESI)

0.232

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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 TOI-2141 d · Sub-Neptune HD 224018 b · Rocky Terrestrial

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