Key parameters at a glance

A radius of 10.30 Earth radii
A mass of 75.20 Earth masses
Surface gravity around 0.71 g
An orbital period of 232.000 days
Semi-major axis 0.7500 AU
Equilibrium temperature 327 K (54 °C)
Distance from Earth 478.99 light-years
Earth Similarity Index 0.369
Travel time at Voyager 1 speed 8,446,921 years

1 sibling around TOI-1386

TOI-1386 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-1386 b	Neptune-like	6.22	45.80	25.840	615	2024
TOI-1386 c this	Gas Giant	10.30	75.20	232.000	327	2024

TOI-1386 c Planet Profile

Physical Specs

Radius

10.30 R⊕

Radius (Jupiter)

0.918 R♃

Mass

75.20 M⊕

Mass (Jupiter)

0.237 M♃

Density

0.38 g/cm³

Surface Gravity

0.71 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.369

HZ Position Inner

Controversial No

Discovery

Year 2024

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#1743of 1771

top 98.4%

This planet

10.30R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-1338 c 10.30 R⊕ TOI-5398 b 10.30 R⊕ OGLE-2017-BLG-0364L b 10.30 R⊕

Metric	Earth	TOI-1386 c	Jupiter
Radius (R⊕)	1.00	10.30	11.21
Mass (M⊕)	1.00	75.20	317.83
Density (g/cm³)	5.51	0.38	1.33
Surface Gravity (g)	1.00	0.71	2.53
Insolation (S⊕)	1.00	1.77	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	75.200 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 343019899

Gaia DR2

Gaia DR2 2005028761147595648

Gaia DR3

Gaia DR3 2005028761147595648

System

TOI-1386

Percentile among Gas Giant cohort

Radius 10.300 R⊕ · percentile 1 / cohort 1771

Mass 75.200 M⊕ · percentile 2 / cohort 1747

Orbital period 232.00 d · percentile 58 / cohort 1533

Distance 146.86 pc · percentile 44 / cohort 1759

ESI 0.369 · percentile 76 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

232.000 days

Semi-major axis

0.7500 AU

Eccentricity

0.380

Inclination

— °

Year Length

A year here lasts approximately 232.00 Earth days (63.5% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.7500 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

8.400 m/s

Transit mid-time (BJD)

2,458,750.9000

Long. of periastron (ω)

71.00°

Angular separation (arcsec)

5.11000

Eq. Temperature

327K

(54 °C)

Insolation (S⊕)

1.77

Earth = 1.00

Earth Similarity (ESI)

0.369

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.

Discovery Paper

Primary reference

Hill et al. 2024

Instrument

HIRES Spectrometer

Publication

2024-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2024 at W. M. Keck Observatory (2 shown).

TOI-1410 c · Neptune-like TOI-1294 c · Gas Giant

Host System: TOI-1386

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,735 K — cooler than the Sun (5,778 K)

Estimated Age

3.20 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.024 R☉

Stellar Mass

1.036 M☉

Metallicity [Fe/H]

0.15

Extended Stellar Properties

Surface gravity (log g)

4.431 dex

Stellar density

1.350 g/cm³

Metallicity ratio

[Fe/H]

Distance

146.86 parsec

Light-years 478.99 ly

V-band magnitude

10.61 mag

Voyager-speed travel 8,446,921 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

6.781 mas

Total Proper Motion

56.071 mas/yr

PM Right Ascension

55.05 mas/yr

PM Declination

10.64 mas/yr

Galactic Cartesian (pc)

x = 0.526 · y = -0.251 · z = 0.812

Equatorial (J2000)

RA 334.50410° · Dec 54.31905°

Galactic ℓ, b

101.697° · -2.102°

Ecliptic λ, β

9.988° · 57.685°

HTM-20 index

-637225182