Key parameters at a glance
- A radius of 6.81 Earth radii
- A mass of 56.64 Earth masses
- Surface gravity around 1.22 g
- An orbital period of 4.314 days
- Semi-major axis 0.0471 AU
- Equilibrium temperature 885 K (612 °C)
- Distance from Earth 439.19 light-years
- Earth Similarity Index 0.197
- Travel time at Voyager 1 speed 7,745,033 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-2374 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#217of 574
top 37.6%
This planet
6.81R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-2374 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 6.81 | 11.21 |
| Mass (M⊕) | 1.00 | 56.64 | 317.83 |
| Density (g/cm³) | 5.51 | 0.98 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.22 | 2.53 |
| Insolation (S⊕) | 1.00 | 132.57 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 56.640 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 56.590 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
TIC
TIC 439366538
Gaia DR2
Gaia DR2 6828814283414902912
Gaia DR3
Gaia DR3 6828814283414902912
System
TOI-2374
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.31 Earth days (1.2% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0471 AU.
Transit Fingerprint
Depth
1.127 %
Duration
1.380 h
Impact parameter b
0.651
Rp / R★
0.091000
Transit midpoint (BJD)
2,458,326.5640
Photometric dip
Transit produces a flux drop of 11,272 ppm lasting ≈ 1.38 h.
Extended Orbital Architecture
Planet / star radius ratio
0.091000
Semi-major axis / stellar radius
14.700
Impact parameter (b)
0.651
RV semi-amplitude (K)
27.000 m/s
Transit mid-time (BJD)
2,458,326.5640
Angular separation (arcsec)
0.35000
Eq. Temperature
885K
(612 °C)
Insolation (S⊕)
132.57
Earth = 1.00
Earth Similarity (ESI)
0.197
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.
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
Hacker et al. 2024Instrument
TESS CCD Array
Publication
2024-06
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-2374
Spectral Class
K-type orange
Effective Temperature
4,802 K — cooler than the Sun (5,778 K)
Estimated Age
4.10 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.690 R☉
Stellar Mass
0.750 M☉
Metallicity [Fe/H]
0.15
Extended Stellar Properties
Surface gravity (log g)
4.140 dex
Stellar density
2.139 g/cm³
Rotational v·sin i
0.50 km/s
Rotation period
50.20 days
Activity index (log R'HK)
-4.980
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
7.398 mas
Total Proper Motion
33.380 mas/yr
PM Right Ascension
-11.51 mas/yr
PM Declination
-31.33 mas/yr
Galactic Cartesian (pc)
x = 0.705 · y = -0.602 · z = -0.375
Equatorial (J2000)
RA 319.49824° · Dec -22.04982°
Galactic ℓ, b
26.648° · -41.564°
Ecliptic λ, β
315.124° · -6.026°
HTM-20 index
-667420586
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