TOI-3288 b
Astrophysical Synthesis & Habitability Characterization
TOI-3288 b is a confirmed gas giant exoplanet orbiting the star TOI-3288, located approximately 653.9 light-years (200.5 parsecs) from the Solar System. First announced in 2025 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 2.7885% across the stellar disk), this world measures 12.24 Earth radii (1.09 Jupiter radii) and has a measured mass of 536.177 Earth masses (1.69 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.61 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 3.58 g⊕ (35.11 m/s²), and an escape velocity of 74 km/s.
In its orbital architecture around TOI-3288, TOI-3288 b completes one full revolution every 1.434 Earth days at a semi-major axis of 0.02285 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 173.4 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.021 (ranging from 0.0224 AU at periapsis to 0.0233 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 973 K (+700°C / +1292°F) and receiving 213.80 S⊕ (~290,982 W/m²), TOI-3288 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-3288 is classified as a low-mass red dwarf of spectral type M0±0.5 with an effective photospheric temperature of 4,072 K, a radius of 0.672 R☉, a mass of 0.643 M☉, an estimated bolometric luminosity of 0.111 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.65 dex (metal-rich relative to the Sun). From Earth, TOI-3288 shines at apparent V-band magnitude 14.979 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere.
Methodology: Computed using the Schulze-Makuch et al. (2011) weighted metric comparing physical interior (radius, estimated density) and surface thermal regime (escape velocity, equilibrium temperature).
Discovery Facility: Transiting Exoplanet Survey Satellite (TESS) · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | TOI-3288 |
| Spectral Type | M0±0.5 |
| Effective Temp (Teff) | 4,072 K |
| Stellar Radius | 0.6720 R☉ |
| Stellar Mass | 0.6430 M☉ |
| Bolometric Luminosity | 0.111 L☉ |
| Metallicity [Fe/H] | 0.650 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 14.979 · G: 14.250 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.022850 AU |
| Orbital Period | 1.434 days |
| Mean Orbital Velocity | 173.4 km/s |
| Orbital Eccentricity (e) | 0.02100 |
| Orbital Inclination (i) | 89.0000° |
| Mean Bulk Density | 1.61 g/cm³ (74 km/s vesc) |
| Insolation Flux | 213.8000 S⊕ (~290,982 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 653.900 LY (200.500 pc) |