Key parameters at a glance
- A radius of 6.22 Earth radii
- A mass of 45.80 Earth masses
- Surface gravity around 1.19 g
- An orbital period of 25.840 days
- Semi-major axis 0.1730 AU
- Equilibrium temperature 615 K (342 °C)
- Distance from Earth 478.99 light-years
- Earth Similarity Index 0.294
- Travel time at Voyager 1 speed 8,446,921 years
1 sibling around TOI-1386
TOI-1386 b 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 this | Neptune-like | 6.22 | 45.80 | 25.840 | 615 | 2024 |
| TOI-1386 c | Gas Giant | 10.30 | 75.20 | 232.000 | 327 | 2024 |
TOI-1386 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#259of 574
top 44.9%
This planet
6.22R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-1386 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 6.22 | 11.21 |
| Mass (M⊕) | 1.00 | 45.80 | 317.83 |
| Density (g/cm³) | 5.51 | 1.04 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.19 | 2.53 |
| Insolation (S⊕) | 1.00 | 34.68 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 45.800 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 47.039 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 Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 25.84 Earth days (7.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1730 AU.
Transit Fingerprint
Depth
0.181 %
Duration
5.670 h
Impact parameter b
0.294
Rp / R★
0.055685
Transit midpoint (BJD)
2,458,752.3210
Photometric dip
Transit produces a flux drop of 1,806 ppm lasting ≈ 5.67 h.
Extended Orbital Architecture
Planet / star radius ratio
0.055685
Impact parameter (b)
0.294
RV semi-amplitude (K)
9.700 m/s
Transit mid-time (BJD)
2,458,752.3210
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
1.18000
Eq. Temperature
615K
(342 °C)
Insolation (S⊕)
34.68
Earth = 1.00
Earth Similarity (ESI)
0.294
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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
Hill et al. 2024Instrument
TESS CCD Array
Publication
2024-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
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]
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
Similar Worlds
Kepler-453 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.20 R⊕ · 1,444.4 ly
HD 49674 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.20 R⊕ · 140.4 ly
TOI-5005 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.25 R⊕ · 678.0 ly
Kepler-397 c
Neptune-like · G-type yellow (Sun-like)
Radius 6.18 R⊕ · 3,160.5 ly
K2-333 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.18 R⊕ · 1,121.9 ly
Kepler-696 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.14 R⊕ · 4,619.8 ly