Key parameters at a glance
- A radius of 3.82 Earth radii
- A mass of 14.00 Earth masses
- Surface gravity around 0.96 g
- An orbital period of 2.260 days
- Semi-major axis 0.0308 AU
- Equilibrium temperature 1,077 K (804 °C)
- Distance from Earth 371.93 light-years
- Earth Similarity Index 0.194
- Travel time at Voyager 1 speed 6,559,020 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-5938 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#54of 1978
top 2.7%
This planet
3.82R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-5938 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.82 | 11.21 |
| Mass (M⊕) | 1.00 | 14.00 | 317.83 |
| Density (g/cm³) | 5.51 | 1.38 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.96 | 2.53 |
| Insolation (S⊕) | 1.00 | 249.27 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 452508760
Gaia DR2
Gaia DR2 1837141272694055168
Gaia DR3
Gaia DR3 1837141272694055168
System
TOI-5938
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.26 Earth days (0.6% of a terrestrial year) at a mean orbital distance of 0.0308 AU.
Transit Fingerprint
Depth
0.268 %
Duration
1.915 h
Impact parameter b
0.190
Rp / R★
0.049150
Transit midpoint (BJD)
2,459,820.1815
Photometric dip
Transit produces a flux drop of 2,680 ppm lasting ≈ 1.92 h.
Extended Orbital Architecture
Planet / star radius ratio
0.049150
Semi-major axis / stellar radius
9.320
Impact parameter (b)
0.190
Transit mid-time (BJD)
2,459,820.1815
Angular separation (arcsec)
0.27000
Eq. Temperature
1,077K
(804 °C)
Insolation (S⊕)
249.27
Earth = 1.00
Earth Similarity (ESI)
0.194
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Morello et al. 2026Instrument
TESS CCD Array
Publication
2026-01
Observation locale
Space
Discovery cohort
Planets confirmed in 2026 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-5938
Spectral Class
K-type orange
Effective Temperature
4,650 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.712 R☉
Stellar Mass
0.744 M☉
Metallicity [Fe/H]
0.07
Extended Stellar Properties
Surface gravity (log g)
4.590 dex
Stellar density
3.003 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
8.740 mas
Total Proper Motion
110.218 mas/yr
PM Right Ascension
-78.87 mas/yr
PM Declination
-76.99 mas/yr
Galactic Cartesian (pc)
x = 0.490 · y = -0.728 · z = 0.480
Equatorial (J2000)
RA 303.90884° · Dec 28.65923°
Galactic ℓ, b
67.797° · -3.544°
Ecliptic λ, β
315.716° · 46.862°
HTM-20 index
-1052820096
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