Key parameters at a glance
- A radius of 3.20 Earth radii
- A mass of 123.00 Earth masses
- Surface gravity around 12.01 g
- An orbital period of 271.945 days
- Semi-major axis 0.8470 AU
- Equilibrium temperature 269 K (-5 °C)
- Distance from Earth 310.51 light-years
- Earth Similarity Index 0.603
- Travel time at Voyager 1 speed 5,475,768 years
TOI-4633 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#348of 1978
top 17.5%
This planet
3.20R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-4633 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.20 | 11.21 |
| Mass (M⊕) | 1.00 | 123.00 | 317.83 |
| Density (g/cm³) | 5.51 | — | 1.33 |
| Surface Gravity (g) | 1.00 | 12.01 | 2.53 |
| Insolation (S⊕) | 1.00 | 1.56 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 123.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 307958020
Gaia DR2
Gaia DR2 1630906044157332224
Gaia DR3
Gaia DR3 1630906044157332224
System
TOI-4633
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 271.94 Earth days (74.5% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.8470 AU.
Transit Fingerprint
Depth
0.048 %
Duration
11.450 h
Impact parameter b
0.330
Rp / R★
0.021110
Transit midpoint (BJD)
2,458,864.8265
Photometric dip
Transit produces a flux drop of 483 ppm lasting ≈ 11.45 h.
Extended Orbital Architecture
Planet / star radius ratio
0.021110
Impact parameter (b)
0.330
RV semi-amplitude (K)
11.500 m/s
Transit mid-time (BJD)
2,458,864.8265
Long. of periastron (ω)
-21.00°
Angular separation (arcsec)
8.90000
Eq. Temperature
269K
(-5 °C)
Insolation (S⊕)
1.56
Earth = 1.00
Earth Similarity (ESI)
0.603
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — surface water would be frozen.
Discovery Paper
Primary reference
Eisner et al. 2024Instrument
TESS CCD Array
Publication
2024-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-4633
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,800 K — hotter than the Sun (5,778 K)
Estimated Age
1.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.050 R☉
Stellar Mass
1.100 M☉
Metallicity [Fe/H]
0.24
Extended Stellar Properties
Surface gravity (log g)
4.022 dex
Stellar density
1.350 g/cm³
Rotational v·sin i
4.39 km/s
Rotation period
12.10 days
Metallicity ratio
[M/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
10.475 mas
Total Proper Motion
70.874 mas/yr
PM Right Ascension
-23.06 mas/yr
PM Declination
-67.02 mas/yr
Galactic Cartesian (pc)
x = -0.105 · y = -0.450 · z = 0.887
Equatorial (J2000)
RA 256.84310° · Dec 62.47555°
Galactic ℓ, b
92.137° · 35.787°
Ecliptic λ, β
209.742° · 83.041°
HTM-20 index
556236332
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