Key parameters at a glance

A radius of 3.22 Earth radii
A mass of 8.97 Earth masses
Surface gravity around 0.87 g
An orbital period of 8.159 days
Equilibrium temperature 1,102 K (829 °C)
Distance from Earth 315.47 light-years
Earth Similarity Index 0.198
Travel time at Voyager 1 speed 5,563,241 years

TOI-3493 b Planet Profile

Physical Specs

Radius

3.22 R⊕

Radius (Jupiter)

0.287 R♃

Mass

8.97 M⊕

Mass (Jupiter)

0.028 M♃

Density

1.47 g/cm³

Surface Gravity

0.87 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.198

HZ Position Inner

Controversial No

Discovery

Year 2025

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#332of 1978

top 16.7%

This planet

3.22R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-648 b 3.22 R⊕ K2-63 b 3.22 R⊕ Kepler-472 b 3.22 R⊕

Metric	Earth	TOI-3493 b	Jupiter
Radius (R⊕)	1.00	3.22	11.21
Mass (M⊕)	1.00	8.97	317.83
Density (g/cm³)	5.51	1.47	1.33
Surface Gravity (g)	1.00	0.87	2.53
Insolation (S⊕)	1.00	245.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	8.970 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 119355

TIC

TIC 203377303

Gaia DR2

Gaia DR2 6192360843805622528

Gaia DR3

Gaia DR3 6192360843805622528

System

TOI-3493

Percentile among Sub-Neptune cohort

Radius 3.220 R⊕ · percentile 83 / cohort 1978

Mass 8.970 M⊕ · percentile 65 / cohort 1978

Orbital period 8.16 d · percentile 27 / cohort 1946

Distance 96.72 pc · percentile 19 / cohort 1975

ESI 0.198 · percentile 7 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

8.159 days

Semi-major axis

— AU

Eccentricity

—

Inclination

89.25 °

Year Length

A year here lasts approximately 8.16 Earth days (2.2% of a terrestrial year).

Transit Fingerprint

Depth

0.076 %

Duration

4.397 h

Impact parameter b

0.180

Transit midpoint (BJD)

2,459,313.0467

Photometric dip

Transit produces a flux drop of 757 ppm lasting ≈ 4.40 h.

Extended Orbital Architecture

Semi-major axis / stellar radius

14.070

Impact parameter (b)

0.180

RV semi-amplitude (K)

2.810 m/s

Transit mid-time (BJD)

2,459,313.0467

Eq. Temperature

1,102K

(829 °C)

Insolation (S⊕)

245.00

Earth = 1.00

Earth Similarity (ESI)

0.198

0 = alien, 1 = Earth-identical

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

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Radial velocity

Stellar wobble has been measured spectroscopically.

Discovery Paper

Primary reference

Chaturvedi et al. 2025

Instrument

TESS CCD Array

Publication

2025-04

Observation locale

Space

Discovery cohort

Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-1266 d · Super-Earth TOI-2267 c · Rocky Terrestrial TOI-5799 c · Super-Earth TOI-5728 b · Super-Earth TOI-5716 b · Rocky Terrestrial TOI-7166 b · Sub-Neptune TOI-2267 b · Rocky Terrestrial TOI-2093 c · Sub-Neptune TOI-2267 d · Super-Earth TOI-5489 c · Super-Earth TOI-1743 b · Super-Earth TOI-4364 b · Sub-Neptune

Host System: TOI-3493

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,844 K — hotter than the Sun (5,778 K)

Estimated Age

7.30 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.228 R☉

Stellar Mass

1.023 M☉

Metallicity [Fe/H]

0.03

Extended Stellar Properties

Surface gravity (log g)

4.250 dex

Stellar density

0.790 g/cm³

Rotational v·sin i

2.20 km/s

Rotation period

37.40 days

Metallicity ratio

[Fe/H]

Distance

96.72 parsec

Light-years 315.47 ly

V-band magnitude

9.32 mag

Voyager-speed travel 5,563,241 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

10.310 mas

Total Proper Motion

84.251 mas/yr

PM Right Ascension

43.38 mas/yr

PM Declination

-72.23 mas/yr

Galactic Cartesian (pc)

x = -0.831 · y = -0.402 · z = -0.384

Equatorial (J2000)

RA 205.79903° · Dec -22.58544°

Galactic ℓ, b

318.302° · 38.737°

Ecliptic λ, β

212.096° · -11.100°

HTM-20 index

441185105