Key parameters at a glance

A radius of 2.00 Earth radii
A mass of 4.67 Earth masses
Surface gravity around 1.17 g
An orbital period of 8.781 days
Semi-major axis 0.0480 AU
Equilibrium temperature 330 K (57 °C)
Distance from Earth 33.36 light-years
Earth Similarity Index 0.757
Travel time at Voyager 1 speed 588,376 years
Almost certainly tidally locked to its host star given the close orbit

L 363-38 b Planet Profile

Physical Specs

Radius

2.00 R⊕

Radius (Jupiter)

0.179 R♃

Mass

4.67 M⊕

Mass (Jupiter)

0.015 M♃

Density

3.21 g/cm³

Surface Gravity

1.17 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.757

HZ Position Unknown

Controversial No

Discovery

Year 2023

Method Radial Velocity

Facility Paranal Observatory

Telescope 8.2 m ESO VLT UT3 Melipal Telescope

Size rank in cohort

Rank by radius

#1955of 1978

top 98.8%

This planet

2.00R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-32 c 2.00 R⊕ Kepler-238 f 2.00 R⊕ Kepler-242 c 2.00 R⊕

Metric	Earth	L 363-38 b	Jupiter
Radius (R⊕)	1.00	2.00	11.21
Mass (M⊕)	1.00	4.67	317.83
Density (g/cm³)	5.51	3.21	1.33
Surface Gravity (g)	1.00	1.17	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	4.670 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 118585685

Gaia DR2

Gaia DR2 4999067471248893952

Gaia DR3

Gaia DR3 4999067471248893952

System

L 363-38

Percentile among Sub-Neptune cohort

Radius 2.000 R⊕ · percentile 0 / cohort 1978

Mass 4.670 M⊕ · percentile 3 / cohort 1978

Orbital period 8.78 d · percentile 29 / cohort 1946

Distance 10.23 pc · percentile 1 / cohort 1975

ESI 0.757 · percentile 97 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

8.781 days

Semi-major axis

0.0480 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 8.78 Earth days (2.4% of a terrestrial year) at a mean orbital distance of 0.0480 AU.

Eq. Temperature

330K

(57 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.757

0 = alien, 1 = Earth-identical

Insufficient insolation data — liquid water is physically possible with adequate atmospheric pressure. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Sartori et al. 2023

Instrument

ESPRESSO

Publication

2023-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2023 at Paranal Observatory (5 shown).

HD 169142 b · Gas Giant HIP 29442 d · Super-Earth HIP 29442 c · Super-Earth AF Lep b · Gas Giant HIP 81208 C b · Gas Giant

Host System: L 363-38

Spectral Class

M-type red dwarf

Effective Temperature

3,129 K — cooler than the Sun (5,778 K)

Estimated Age

8.07 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.274 R☉

Stellar Mass

0.210 M☉

Metallicity [Fe/H]

—

Distance

10.23 parsec

Light-years 33.36 ly

V-band magnitude

13.03 mag

Voyager-speed travel 588,376 yr

Multi-band Host Photometry — 7 bands

Astrometric Data

Parallax

97.728 mas

Total Proper Motion

760.126 mas/yr

PM Right Ascension

-488.56 mas/yr

PM Declination

-582.33 mas/yr

Galactic Cartesian (pc)

x = 0.738 · y = 0.141 · z = -0.660

Equatorial (J2000)

RA 10.85554° · Dec -41.29529°

Galactic ℓ, b

309.054° · -75.738°

Ecliptic λ, β

349.802° · -41.435°

HTM-20 index

1537888010