Key parameters at a glance

A radius of 3.18 Earth radii
A mass of 10.22 Earth masses
Surface gravity around 1.01 g
An orbital period of 16.553 days
Semi-major axis 0.1290 AU
Distance from Earth 368.42 light-years
Earth Similarity Index 0.620
Travel time at Voyager 1 speed 6,497,074 years

1 sibling around TOI-2458

TOI-2458 c 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-2458 b	Sub-Neptune	2.83	13.31	3.737	1,509	2024
TOI-2458 c this	Sub-Neptune	3.18	10.22	16.553	—	2024

TOI-2458 c Planet Profile

Physical Specs

Radius

3.18 R⊕

Radius (Jupiter)

0.283 R♃

Mass

10.22 M⊕

Mass (Jupiter)

0.032 M♃

Density

1.75 g/cm³

Surface Gravity

1.01 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.620

HZ Position Unknown

Controversial No

Discovery

Year 2024

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#367of 1978

top 18.5%

This planet

3.18R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

NGTS-4 b 3.18 R⊕ HD 216520 b 3.18 R⊕ Kepler-1502 b 3.18 R⊕

Metric	Earth	TOI-2458 c	Jupiter
Radius (R⊕)	1.00	3.18	11.21
Mass (M⊕)	1.00	10.22	317.83
Density (g/cm³)	5.51	1.75	1.33
Surface Gravity (g)	1.00	1.01	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	10.220 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 34562

TIC

TIC 449197831

Gaia DR2

Gaia DR2 3233785128901216128

Gaia DR3

Gaia DR3 3233785128901216128

System

TOI-2458

Percentile among Sub-Neptune cohort

Radius 3.180 R⊕ · percentile 81 / cohort 1978

Mass 10.220 M⊕ · percentile 75 / cohort 1978

Orbital period 16.55 d · percentile 55 / cohort 1946

Distance 112.96 pc · percentile 22 / cohort 1975

ESI 0.620 · percentile 85 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

16.553 days

Semi-major axis

0.1290 AU

Eccentricity

0.290

Inclination

— °

Year Length

A year here lasts approximately 16.55 Earth days (4.5% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1290 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.620

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

& Scaron Ubjak et al. 2024

Instrument

HARPS Spectrograph

Publication

2024-09

Observation locale

Ground

Host System: TOI-2458

Spectral Class

F-type yellow-white

Effective Temperature

6,005 K — hotter than the Sun (5,778 K)

Estimated Age

5.70 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.310 R☉

Stellar Mass

1.050 M☉

Metallicity [Fe/H]

-0.10

Extended Stellar Properties

Surface gravity (log g)

4.200 dex

Stellar density

0.659 g/cm³

Rotational v·sin i

2.50 km/s

Rotation period

8.90 days

Metallicity ratio

[Fe/H]

Distance

112.96 parsec

Light-years 368.42 ly

V-band magnitude

9.20 mag

Voyager-speed travel 6,497,074 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

8.824 mas

Total Proper Motion

99.311 mas/yr

PM Right Ascension

-3.09 mas/yr

PM Declination

-99.26 mas/yr

Galactic Cartesian (pc)

x = 0.180 · y = 0.983 · z = 0.022

Equatorial (J2000)

RA 79.62153° · Dec 1.25344°

Galactic ℓ, b

200.689° · -19.943°

Ecliptic λ, β

78.812° · -21.784°

HTM-20 index

126928714