TOI-3353.01
Astrophysical Synthesis & Habitability Characterization
TOI-3353.01 is a confirmed sub-neptune exoplanet orbiting the star TOI-3353, located approximately 256.9 light-years (78.76 parsecs) from the Solar System. First announced in 2024 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.0574% across the stellar disk), this world measures 2.667 Earth radii and has a measured mass of 7.59 Earth masses. Combining its mass and radius yields a mean bulk density of 2.21 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.07 g⊕ (10.49 m/s²), and an escape velocity of 18.9 km/s.
In its orbital architecture around TOI-3353, TOI-3353.01 completes one full revolution every 4.666 Earth days at a semi-major axis of 0.060118 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 140.2 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1264 K (+991°C / +1816°F) and receiving 313.04 S⊕ (~426,051 W/m²), TOI-3353.01 orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-3353 is classified as a stellar host with an effective photospheric temperature of 6,365 K, a radius of 1.0207 R☉, a mass of 1.3321 M☉, an estimated bolometric luminosity of 1.534 L☉. From Earth, TOI-3353 shines at apparent V-band magnitude 9.327 (accessible to binoculars and small amateur telescopes) 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-3353 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,365 K |
| Stellar Radius | 1.0207 R☉ |
| Stellar Mass | 1.3321 M☉ |
| Bolometric Luminosity | 1.534 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 9.327 · G: 9.238 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.060118 AU |
| Orbital Period | 4.666 days |
| Mean Orbital Velocity | 140.2 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 2.21 g/cm³ (18.9 km/s vesc) |
| Insolation Flux | 313.0426 S⊕ (~426,051 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 256.900 LY (78.758 pc) |