Key parameters at a glance
- A radius of 12.24 Earth radii
- A mass of 536.18 Earth masses
- Surface gravity around 3.58 g
- An orbital period of 1.434 days
- Semi-major axis 0.0229 AU
- Equilibrium temperature 973 K (700 °C)
- Distance from Earth 653.94 light-years
- Earth Similarity Index 0.164
- Travel time at Voyager 1 speed 11,532,280 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-3288 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1397of 1771
top 78.8%
This planet
12.24R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-3288 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.24 | 11.21 |
| Mass (M⊕) | 1.00 | 536.18 | 317.83 |
| Density (g/cm³) | 5.51 | 1.60 | 1.33 |
| Surface Gravity (g) | 1.00 | 3.58 | 2.53 |
| Insolation (S⊕) | 1.00 | 213.80 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 536.177 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 79920467
Gaia DR2
Gaia DR2 6685431748042347776
Gaia DR3
Gaia DR3 6685431748042347776
System
TOI-3288
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.43 Earth days (0.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0228 AU.
Transit Fingerprint
Depth
3.136 %
Duration
41.690 h
Impact parameter b
0.128
Rp / R★
0.167010
Transit midpoint (BJD)
2,460,343.9069
Photometric dip
Transit produces a flux drop of 31,360 ppm lasting ≈ 41.69 h.
Extended Orbital Architecture
Planet / star radius ratio
0.167010
Semi-major axis / stellar radius
7.330
Impact parameter (b)
0.128
RV semi-amplitude (K)
433.000 m/s
Transit mid-time (BJD)
2,460,343.9069
Long. of periastron (ω)
174.00°
Angular separation (arcsec)
0.11400
Eq. Temperature
973K
(700 °C)
Insolation (S⊕)
213.80
Earth = 1.00
Earth Similarity (ESI)
0.164
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
Frensch et al. 2025Instrument
TESS CCD Array
Publication
2025-10
Observation locale
Space
Discovery cohort
Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-3288
Spectral Class
M-type red dwarf
Effective Temperature
4,072 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.672 R☉
Stellar Mass
0.643 M☉
Metallicity [Fe/H]
0.65
Extended Stellar Properties
Surface gravity (log g)
4.592 dex
Stellar density
3.240 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.959 mas
Total Proper Motion
21.145 mas/yr
PM Right Ascension
-6.52 mas/yr
PM Declination
-20.11 mas/yr
Galactic Cartesian (pc)
x = 0.333 · y = -0.651 · z = -0.682
Equatorial (J2000)
RA 297.11032° · Dec -43.01800°
Galactic ℓ, b
356.393° · -28.117°
Ecliptic λ, β
290.985° · -21.534°
HTM-20 index
-1395801422
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