Key parameters at a glance
- A radius of 4.26 Earth radii
- A mass of 20.10 Earth masses
- Surface gravity around 1.11 g
- An orbital period of 3.785 days
- Semi-major axis 0.0490 AU
- Equilibrium temperature 1,445 K (1172 °C)
- Distance from Earth 1,148.95 light-years
- Earth Similarity Index 0.136
- Travel time at Voyager 1 speed 20,261,670 years
TOI-333 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#506of 574
top 88.0%
This planet
4.26R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-333 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.26 | 11.21 |
| Mass (M⊕) | 1.00 | 20.10 | 317.83 |
| Density (g/cm³) | 5.51 | 1.42 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.11 | 2.53 |
| Insolation (S⊕) | 1.00 | 650.50 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 20.100 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 224245334
Gaia DR2
Gaia DR2 6535747220036134272
Gaia DR3
Gaia DR3 6535747220036134272
System
TOI-333
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.79 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0490 AU.
Transit Fingerprint
Depth
0.134 %
Duration
3.200 h
Impact parameter b
0.120
Rp / R★
0.035000
Transit midpoint (BJD)
2,458,355.5759
Photometric dip
Transit produces a flux drop of 1,339 ppm lasting ≈ 3.20 h.
Extended Orbital Architecture
Planet / star radius ratio
0.035000
Semi-major axis / stellar radius
9.260
Impact parameter (b)
0.120
RV semi-amplitude (K)
7.900 m/s
Transit mid-time (BJD)
2,458,355.5759
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.13900
Eq. Temperature
1,445K
(1172 °C)
Insolation (S⊕)
650.50
Earth = 1.00
Earth Similarity (ESI)
0.136
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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
Alves et al. 2025Instrument
TESS CCD Array
Publication
2025-11
Observation locale
Space
Discovery cohort
Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-333
Spectral Class
F-type yellow-white
Effective Temperature
6,241 K — hotter than the Sun (5,778 K)
Estimated Age
1.00 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.100 R☉
Stellar Mass
1.200 M☉
Metallicity [Fe/H]
0.01
Extended Stellar Properties
Surface gravity (log g)
4.410 dex
Stellar density
1.050 g/cm³
Rotational v·sin i
6.18 km/s
Rotation period
9.01 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
2.810 mas
Total Proper Motion
16.797 mas/yr
PM Right Ascension
16.70 mas/yr
PM Declination
1.79 mas/yr
Galactic Cartesian (pc)
x = 0.748 · y = -0.087 · z = -0.658
Equatorial (J2000)
RA 353.35750° · Dec -41.17152°
Galactic ℓ, b
346.699° · -68.698°
Ecliptic λ, β
335.432° · -34.705°
HTM-20 index
-2040837955
Similar Worlds
DMPP-1 b
Neptune-like · F-type yellow-white
Radius 4.26 R⊕ · 204.0 ly
Kepler-279 c
Neptune-like · F-type yellow-white
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Kepler-359 c
Neptune-like · F-type yellow-white
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Kepler-584 b
Neptune-like · F-type yellow-white
Radius 4.21 R⊕ · 6,030.1 ly
Kepler-145 c
Neptune-like · F-type yellow-white
Radius 4.32 R⊕ · 1,848.8 ly
Kepler-458 c
Neptune-like · F-type yellow-white
Radius 4.20 R⊕ · 5,201.3 ly