Key parameters at a glance

A radius of 13.60 Earth radii
A mass of 445.60 Earth masses
Surface gravity around 2.41 g
An orbital period of 297.900 days
Semi-major axis 0.9840 AU
Equilibrium temperature 434 K (161 °C)
Distance from Earth 1,292.27 light-years
Earth Similarity Index 0.322
Travel time at Voyager 1 speed 22,789,224 years

2 siblings around TOI-375

TOI-375 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-375 b	Gas Giant	10.77	236.78	9.455	1,373	2026
TOI-375 c	Gas Giant	13.40	669.35	115.500	596	2026
TOI-375 d this	Gas Giant	13.60	445.60	297.900	434	2026

TOI-375 d Planet Profile

Physical Specs

Radius

13.60 R⊕

Radius (Jupiter)

1.210 R♃

Mass

445.60 M⊕

Mass (Jupiter)

1.402 M♃

Density

0.97 g/cm³

Surface Gravity

2.41 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.322

HZ Position Inner

Controversial No

Discovery

Year 2026

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#609of 1771

top 34.3%

This planet

13.60R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 19994 b 13.60 R⊕ HD 205739 b 13.60 R⊕ HD 79498 b 13.60 R⊕

Metric	Earth	TOI-375 d	Jupiter
Radius (R⊕)	1.00	13.60	11.21
Mass (M⊕)	1.00	445.60	317.83
Density (g/cm³)	5.51	0.97	1.33
Surface Gravity (g)	1.00	2.41	2.53
Insolation (S⊕)	1.00	5.96	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	445.595 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 280097543

Gaia DR2

Gaia DR2 4638853885598035968

Gaia DR3

Gaia DR3 4638853885598035968

System

TOI-375

Percentile among Gas Giant cohort

Radius 13.600 R⊕ · percentile 63 / cohort 1771

Mass 445.595 M⊕ · percentile 45 / cohort 1747

Orbital period 297.90 d · percentile 60 / cohort 1533

Distance 396.21 pc · percentile 69 / cohort 1759

ESI 0.322 · percentile 63 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

297.900 days

Semi-major axis

0.9840 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 297.90 Earth days (81.6% of a terrestrial year) at a mean orbital distance of 0.9840 AU.

Eq. Temperature

434K

(161 °C)

Insolation (S⊕)

5.96

Earth = 1.00

Earth Similarity (ESI)

0.322

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

Reinarz et al. 2026

Instrument

Multiple Instruments

Publication

2026-01

Observation locale

Ground

Discovery cohort

Planets confirmed in 2026 at Multiple Observatories (12 shown).

DMPP-6 b · Sub-Neptune TOI-4336 A c · Super-Earth GJ 887 d · Sub-Neptune HD 176986 d · Sub-Neptune GJ 887 e · Rocky Terrestrial DMPP-6 c · Sub-Neptune DMPP-9 b · Sub-Neptune TOI-5789 d · Super-Earth TOI-5789 e · Sub-Neptune HD 85426 c · Sub-Neptune DMPP-2 c · Neptune-like DMPP-7 b · Neptune-like

Host System: TOI-375

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,260 K — cooler than the Sun (5,778 K)

Estimated Age

2.94 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

2.900 R☉

Stellar Mass

1.441 M☉

Metallicity [Fe/H]

0.08

Extended Stellar Properties

Surface gravity (log g)

3.672 dex

Stellar density

0.083 g/cm³

Rotational v·sin i

2.97 km/s

Metallicity ratio

[Fe/H]

Distance

396.21 parsec

Light-years 1,292.27 ly

V-band magnitude

11.52 mag

Voyager-speed travel 22,789,224 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

2.495 mas

Total Proper Motion

6.424 mas/yr

PM Right Ascension

-4.79 mas/yr

PM Declination

-4.28 mas/yr

Galactic Cartesian (pc)

x = 0.149 · y = 0.160 · z = -0.976

Equatorial (J2000)

RA 47.14990° · Dec -77.38333°

Galactic ℓ, b

294.036° · -37.271°

Ecliptic λ, β

301.619° · -73.542°

HTM-20 index

-1573057111