Key parameters at a glance

A radius of 2.83 Earth radii
A mass of 8.40 Earth masses
Surface gravity around 1.05 g
An orbital period of 4.079 days
Semi-major axis 0.0506 AU
Equilibrium temperature 695 K (422 °C)
Distance from Earth 199.51 light-years
Earth Similarity Index 0.348
Travel time at Voyager 1 speed 3,518,410 years
Almost certainly tidally locked to its host star given the close orbit

TOI-5319 b Planet Profile

Physical Specs

Radius

2.83 R⊕

Radius (Jupiter)

0.252 R♃

Mass

8.40 M⊕

Mass (Jupiter)

0.026 M♃

Density

2.04 g/cm³

Surface Gravity

1.05 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.348

HZ Position Inner

Controversial No

Discovery

Year 2024

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#703of 1978

top 35.5%

This planet

2.83R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 3167 e 2.83 R⊕ GJ 3634 b 2.83 R⊕ Kepler-1099 b 2.83 R⊕

Metric	Earth	TOI-5319 b	Jupiter
Radius (R⊕)	1.00	2.83	11.21
Mass (M⊕)	1.00	8.40	317.83
Density (g/cm³)	5.51	2.04	1.33
Surface Gravity (g)	1.00	1.05	2.53
Insolation (S⊕)	1.00	38.79	0.037

Star Catalogue Identifiers

TIC

TIC 246965431

Gaia DR2

Gaia DR2 102461087706561024

Gaia DR3

Gaia DR3 102461087706561024

System

TOI-5319

Percentile among Sub-Neptune cohort

Radius 2.830 R⊕ · percentile 64 / cohort 1978

Mass 8.400 M⊕ · percentile 58 / cohort 1978

Orbital period 4.08 d · percentile 8 / cohort 1946

Distance 61.17 pc · percentile 13 / cohort 1975

ESI 0.348 · percentile 40 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

4.079 days

Semi-major axis

0.0506 AU

Eccentricity

—

Inclination

89.25 °

Year Length

A year here lasts approximately 4.08 Earth days (1.1% of a terrestrial year) at a mean orbital distance of 0.0506 AU.

Transit Fingerprint

Depth

0.453 %

Duration

1.561 h

Impact parameter b

0.300

Rp / R★

0.060900

Transit midpoint (BJD)

2,459,496.5862

Photometric dip

Transit produces a flux drop of 4,530 ppm lasting ≈ 1.56 h.

Extended Orbital Architecture

Planet / star radius ratio

0.060900

Semi-major axis / stellar radius

22.460

Impact parameter (b)

0.300

Transit mid-time (BJD)

2,459,496.5862

Angular separation (arcsec)

0.82700

Eq. Temperature

695K

(422 °C)

Insolation (S⊕)

38.79

Earth = 1.00

Earth Similarity (ESI)

0.348

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Pel & Aacute Ez Torres et al. 2024

Instrument

TESS CCD Array

Publication

2024-10

Observation locale

Space

Discovery cohort

Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

Gliese 12 b · Rocky Terrestrial TOI-6002 b · Super-Earth TOI-5713 b · Super-Earth TOI-4336 A b · Sub-Neptune TOI-406.01 · Sub-Neptune TOI-1224 c · Sub-Neptune LHS 1678 d · Rocky Terrestrial TOI-2088 b · Sub-Neptune TOI-2120 b · Sub-Neptune TOI-1806.01 · Sub-Neptune TOI-4633 c · Sub-Neptune TOI-260 b · Super-Earth

Host System: TOI-5319

Spectral Class

M-type red dwarf

Effective Temperature

3,580 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.485 R☉

Stellar Mass

0.500 M☉

Metallicity [Fe/H]

—

Distance

61.17 parsec

Light-years 199.51 ly

V-band magnitude

13.95 mag

Voyager-speed travel 3,518,410 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

16.319 mas

Total Proper Motion

96.363 mas/yr

PM Right Ascension

41.97 mas/yr

PM Declination

-86.74 mas/yr

Galactic Cartesian (pc)

x = 0.749 · y = 0.529 · z = 0.399

Equatorial (J2000)

RA 35.21356° · Dec 23.52044°

Galactic ℓ, b

148.109° · -34.942°

Ecliptic λ, β

40.673° · 8.965°

HTM-20 index

1204033705