Key parameters at a glance

A radius of 5.22 Earth radii
A mass of 23.70 Earth masses
Surface gravity around 0.87 g
An orbital period of 4.872 days
Equilibrium temperature 1,042 K (769 °C)
Distance from Earth 947.96 light-years
Earth Similarity Index 0.175
Travel time at Voyager 1 speed 16,717,263 years

TOI-5238 b Planet Profile

Physical Specs

Radius

5.22 R⊕

Radius (Jupiter)

0.466 R♃

Mass

23.70 M⊕

Mass (Jupiter)

0.075 M♃

Density

0.92 g/cm³

Surface Gravity

0.87 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.175

HZ Position Inner

Controversial No

Discovery

Year 2022

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#355of 574

top 61.7%

This planet

5.22R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

Kepler-418 c 5.22 R⊕ Kepler-25 c 5.22 R⊕ Kepler-562 b 5.21 R⊕

Metric	Earth	TOI-5238 b	Jupiter
Radius (R⊕)	1.00	5.22	11.21
Mass (M⊕)	1.00	23.70	317.83
Density (g/cm³)	5.51	0.92	1.33
Surface Gravity (g)	1.00	0.87	2.53
Insolation (S⊕)	1.00	195.93	0.037

Star Catalogue Identifiers

TIC

TIC 219016883

Gaia DR2

Gaia DR2 1694625251248104832

Gaia DR3

Gaia DR3 1694625251248104832

System

TOI-5238

Percentile among Neptune-like cohort

Radius 5.220 R⊕ · percentile 38 / cohort 574

Mass 23.700 M⊕ · percentile 40 / cohort 574

Orbital period 4.87 d · percentile 19 / cohort 524

Distance 290.65 pc · percentile 47 / cohort 572

ESI 0.175 · percentile 22 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

4.872 days

Semi-major axis

— AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 4.87 Earth days (1.3% of a terrestrial year).

Transit Fingerprint

Depth

0.218 %

Duration

2.584 h

Transit midpoint (BJD)

2,459,661.5157

Photometric dip

Transit produces a flux drop of 2,180 ppm lasting ≈ 2.58 h.

Eq. Temperature

1,042K

(769 °C)

Insolation (S⊕)

195.93

Earth = 1.00

Earth Similarity (ESI)

0.175

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Mantovan et al. 2022

Instrument

TESS CCD Array

Publication

2022-11

Observation locale

Space

Discovery cohort

Planets confirmed in 2022 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-1452 b · Super-Earth TOI-712 d · Sub-Neptune TOI-1468 c · Sub-Neptune TOI-2136 b · Sub-Neptune LTT 1445 A c · Rocky Terrestrial TOI-712 c · Sub-Neptune LP 890-9 b · Super-Earth TOI-2081 b · Sub-Neptune GJ 3929 b · Rocky Terrestrial HD 260655 c · Super-Earth HD 73583 c · Sub-Neptune TOI-1759 b · Sub-Neptune

Host System: TOI-5238

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,631 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.023 R☉

Stellar Mass

1.000 M☉

Metallicity [Fe/H]

—

Distance

290.65 parsec

Light-years 947.96 ly

V-band magnitude

12.21 mag

Voyager-speed travel 16,717,263 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

3.412 mas

Total Proper Motion

19.972 mas/yr

PM Right Ascension

-7.54 mas/yr

PM Declination

-18.49 mas/yr

Galactic Cartesian (pc)

x = -0.262 · y = -0.248 · z = 0.933

Equatorial (J2000)

RA 223.35889° · Dec 68.85947°

Galactic ℓ, b

108.041° · 44.577°

Ecliptic λ, β

151.252° · 72.598°

HTM-20 index

-1584958101