Key parameters at a glance
- A radius of 9.98 Earth radii
- A mass of 50.85 Earth masses
- Surface gravity around 0.51 g
- An orbital period of 17.102 days
- Semi-major axis 0.1270 AU
- Equilibrium temperature 842 K (569 °C)
- Distance from Earth 755.97 light-years
- Earth Similarity Index 0.152
- Travel time at Voyager 1 speed 13,331,546 years
TOI-2328 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#5of 574
top 0.7%
This planet
9.98R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-2328 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 9.98 | 11.21 |
| Mass (M⊕) | 1.00 | 50.85 | 317.83 |
| Density (g/cm³) | 5.51 | 0.29 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.51 | 2.53 |
| Insolation (S⊕) | 1.00 | 20.10 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 50.853 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 394287035
Gaia DR2
Gaia DR2 4619939536821435904
Gaia DR3
Gaia DR3 4619939536821435904
System
TOI-2328
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 17.10 Earth days (4.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1270 AU.
Transit Fingerprint
Depth
1.143 %
Duration
3.357 h
Impact parameter b
0.688
Rp / R★
0.102000
Transit midpoint (BJD)
2,458,330.4894
Photometric dip
Transit produces a flux drop of 11,430 ppm lasting ≈ 3.36 h.
Extended Orbital Architecture
Planet / star radius ratio
0.102000
Impact parameter (b)
0.688
RV semi-amplitude (K)
13.290 m/s
Transit mid-time (BJD)
2,458,330.4894
Long. of periastron (ω)
148.70°
Angular separation (arcsec)
0.54800
Eq. Temperature
842K
(569 °C)
Insolation (S⊕)
20.10
Earth = 1.00
Earth Similarity (ESI)
0.152
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
Tala Pinto et al. 2025Instrument
TESS CCD Array
Publication
2025-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-2328
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,525 K — cooler than the Sun (5,778 K)
Estimated Age
4.00 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.900 R☉
Stellar Mass
0.950 M☉
Metallicity [Fe/H]
0.09
Extended Stellar Properties
Surface gravity (log g)
4.505 dex
Stellar density
1.806 g/cm³
Rotational v·sin i
2.61 km/s
Activity index (log R'HK)
-5.088
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.286 mas
Total Proper Motion
31.848 mas/yr
PM Right Ascension
31.80 mas/yr
PM Declination
-1.68 mas/yr
Galactic Cartesian (pc)
x = 0.129 · y = 0.080 · z = -0.988
Equatorial (J2000)
RA 31.69074° · Dec -81.24738°
Galactic ℓ, b
299.479° · -35.370°
Ecliptic λ, β
292.038° · -69.817°
HTM-20 index
1988121424
Similar Worlds
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Neptune-like · G-type yellow (Sun-like)
Radius 9.98 R⊕ · 561.8 ly
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Neptune-like · G-type yellow (Sun-like)
Radius 9.98 R⊕ · 2,278.7 ly
HIP 67522 b
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TOI-1135 b
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WASP-60 b
Neptune-like · G-type yellow (Sun-like)
Radius 9.86 R⊕ · 1,405.9 ly